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PLC CPU Unit Specification Comparison (iQ-R R120 / KV-8000 / CJ2H / CJ3M / KV-X550 / NX502)
This page compares, in table form, the CPU unit specifications of the Mitsubishi Electric MELSEC iQ-R R120(EN)CPU, KEYENCE KV-8000 and OMRON CJ2H-CPU68(-EIP) / CJ3M-CPU35, based on each manufacturer's catalogs and user's manuals. The IEC 61131-3 compliant controllers KEYENCE KV-X550 and OMRON NX502 are compared in a separate table. Processing speed and memory capacity are also compared in charts, which include high-end models from overseas manufacturers (Siemens, Rockwell Automation, Schneider Electric) for reference. A PC-based PLC (Beckhoff) is listed at the end of the tables for reference. For the meaning of the symbols, see the legend at the end of the page.
- R120(EN)CPU (Mitsubishi Electric)
- KV-8000（KEYENCE）
- CJ2H-CPU68(-EIP)（OMRON）
- CJ3M-CPU35（OMRON）
- KV-X550 (KEYENCE, IEC 61131-3 compliant)
- NX502 (OMRON, IEC 61131-3 compliant)
- High-end overseas models: S7-1518 (Siemens) / ControlLogix L85E (Rockwell) / Modicon M580 (Schneider) *charts only
Processing speed and memory compared in charts
Instruction execution time
Unit: ns. Shorter bars are faster.
Basic instructions
Application instructions
- R120 shows the LD/MOV instruction values, KV-8000 the "minimum" values, CJ2H/CJ3M the fastest value of the stated range, KV-X550 the fastest value for contact I/O, and NX502 the LD instruction value. Because each manufacturer defines instructions differently, treat these as rough guides.
- KV-X550 and NX502 do not publish application instruction execution times, so they are shown as "not specified".
- Overseas manufacturers: S7-1518 (CPU 1518-4 PN/DP) uses representative values per instruction type (basic = bit operations, application = word operations), ControlLogix L85E (1756-L85E) uses estimated values per instruction (basic = XIC, application = MOV (DINT)), and Modicon M580 (BMEP586040) uses an average per instruction converted from instructions per ms (Kinst/ms), so these are shown hatched (reference values).
- On the linear scale the bars for R120, KV-8000, KV-X550 and NX502 become very short. Switch to "Logarithmic" to read the differences.
Floating-point addition instruction execution time
Unit: ns. Split into single and double precision; models without published values are shown as "not specified".
Hatched: reference value (not specific to the addition instruction)
Single-precision (REAL) addition
Double-precision (LREAL) addition
- OMRON: +F / +D instructions (instruction execution times in the SBCA-350 appendix). R120: E+ instruction (catalog). ControlLogix L85E: estimated value for ADD (REAL).
- S7-1518 lists "floating-point arithmetic 6 ns" without specifying precision, so it is shown hatched as a reference value in the single-precision column. Modicon M580 does not publish floating-point values.
- KV-8000 publishes only "double-precision floating-point instructions min. 58 ns", KV-X550 only "double-precision floating-point arithmetic from 1.0 ns", and NX502 only "arithmetic instructions (double-precision real) 3.3 ns", so these are shown hatched as reference values in the double-precision column.
Capacity of data memory devices
Unit: words (16 bits). Data memory, extended data memory and file registers are stacked.
- CJ2H / CJ3M have no separate file register device; EM is converted to file memory instead (stacked as 0).
- R120 allocates device points by parameter, so the default values (D 18432 points, R/ZR 0 points) are shown. Since it has no device equivalent to extended data memory, the refresh data register RD (524288 points) is stacked hatched for reference.
Variable / data capacity (IEC 61131-3 compliant models)
Unit: MB. KV-X550 / NX502 stack retained and non-retained variables; the high-end overseas models show the memory capacity for data, or shared program/data memory.
- KV-X550 has 5.5 MB retained out of a total variable capacity of 124 MB (the non-retained part is shown as the difference, 118.5 MB). The total number of variables is 200,000 (100,000 retained).
- NX502 is the sum of 4 MB with the Retain attribute and 256 MB without it (number of variables: 40,000 / 360,000). The variable capacity includes memory for CJ-series Units.
- KV-X550 additionally has 1.5 MB of KV-compatible devices (DM / EM / ZF etc.).
- S7-1518 has 60 MB of work memory for data (6 MB for programs is separate). The 40 MB user memory of the ControlLogix L85E and the 64 MB built-in RAM of the Modicon M580 are shared between program and data, so they are shown hatched. Memory categories differ by manufacturer, so treat these as rough guides.
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Basic specifications
| Item | Mitsubishi Electric R120(EN)CPU | KEYENCE KV-8000 | OMRON CJ2H-CPU68(-EIP) | OMRON CJ3M-CPU35 |
|---|---|---|---|---|
| Programming languages | LD、ST、FBD、SFC | Expanded ladder, KV Script, ST, mnemonic | Ladder (LD), SFC, ST, IL | |
| Programming extensions | Function blocks (FB), label programming (system/local/global) | Function blocks, variables and structures | Function blocks, variables | |
| Program execution types / tasks | Initial execution, scan execution, fixed-cycle execution, event execution, standby Number of programs 252 / FB files 128 | Modules: every scan / initialization / standby / fixed-cycle (max. 4) / inter-unit synchronization Interrupts: expansion unit interrupts max. 64 | Cyclic tasks: 128 Interrupt tasks: 256 (power OFF / scheduled / I/O / external interrupt) | Cyclic tasks: 128 Interrupt tasks: 256 (power OFF / scheduled / I/O / external / built-in input interrupt) |
| Constant scan time | 0.2 to 2000 ms (0.1 ms units) | 0.10 to 200.00 ms (0.01 ms units) | 0.2 to 32,000 ms (0.1 ms units) *functional specification | |
| Fixed-cycle execution | Internal timer interrupts (I28 to I31): 0.5 to 1000 ms (0.5 ms units) High-speed internal timer interrupts (I48/I49): 0.05 to 1000 ms (0.05 ms units) | Fixed-cycle module: 0.05 to 6000.00 ms (0.01 ms units) or 0.01 to 60.00 s | Scheduled interrupt minimum interval: 0.2 ms, or 0.1 ms (with high-speed interrupt startup) | Scheduled interrupt minimum interval: 0.4 ms (0.1 ms units) |
Memory capacity
| Item | Mitsubishi Electric R120(EN)CPU | KEYENCE KV-8000 | OMRON CJ2H-CPU68(-EIP) | OMRON CJ3M-CPU35 |
|---|---|---|---|---|
| Program capacity | 1200K steps | Approx. 1500K steps | 400K steps | 100K steps |
| CPU memory / program memory | Program memory 4800 KB Function memory 20480 KB / refresh memory 2048 KB | CPU memory 64 MB (project capacity + user memory capacity) | Built-in RAM (for execution) + built-in flash memory (automatic backup of program/parameters) | |
| Device / label memory | Total 3380 KB (devices 80K / labels 220K / latch labels 8K / file storage 3072 KB) Expandable with an extended SRAM cassette | Work area for variables: bits 64000 / words 589824 / timers 4000 / counters 4000 | I/O memory area (built-in RAM, battery-backed) | I/O memory area (non-volatile RAM, retained without battery) |
| Data memory (for file storage) | 40 MB | User memory 40 MB (part of the 64 MB CPU memory) | EM file memory (EM converted to file memory) + memory card | |
| FB program area | Signal flow memory, FB area 256 KB (reference) | No dedicated area specified (FB nesting up to 8 levels) | — | 40K steps |
| Source / comment memory | Not specified | Device comments approx. 224,000 (8 files) / labels approx. 285,000 / variables approx. 100,000 | 3.5 MB | 2 MB |
| Memory card | SD/SDHC memory card up to 32 GB (cataloged products 2/4/8/16 GB) | SD/SDHC（KV-M1G 1 GB／KV-M4G 4 GB／KV-M16G 16 GB） | 128 / 256 / 512 MB | SD card 2 / 4 / 16 GB (HMC-SD□) |
| Extended SRAM cassette | Supported (1M / 2M / 4M / 8M / 16 MB) | — | ||
Processing speed
| Item | Mitsubishi Electric R120(EN)CPU | KEYENCE KV-8000 | OMRON CJ2H-CPU68(-EIP) | OMRON CJ3M-CPU35 |
|---|---|---|---|---|
| Basic instruction execution time | LD instruction 0.98 ns | Min. 0.96 ns | 16 ns ～ | 40 ns ～ |
| Application instruction execution time | MOV instruction 1.96 ns | Min. 5.75 ns | 48 ns ～ | 60 ns ～ |
| Double-precision floating-point instruction execution time | Not specified | Min. 58 ns | Not specified | Not specified |
| Floating-point addition instruction execution time | E+ instruction 9.8 ns | Not specified | +F instruction 240 ns | +F instruction 660 ns |
| Double-precision floating-point addition instruction execution time | Not specified | Not specified | +D instruction 6000 ns | +D instruction 7100 ns |
| I/O interrupts / external interrupts | Multiple interrupts supported | Expansion unit interrupts max. 64 (priority configurable) | Startup 26 μs (high-speed 17 μs) / return 11 μs (high-speed 8 μs) | Startup 31 μs / return 10 μs |
| Scheduled interrupts | Not specified | Fixed-cycle modules max. 4 (0.05 to 6000.00 ms) Period jitter within 15 μs (under certain conditions) | Startup 22 μs (high-speed 13 μs) / return 11 μs (high-speed 8 μs) | Startup 30 μs / return 11 μs |
System configuration
| Item | Mitsubishi Electric R120(EN)CPU | KEYENCE KV-8000 | OMRON CJ2H-CPU68(-EIP) | OMRON CJ3M-CPU35 |
|---|---|---|---|---|
| I/O points | 4096 points [X/Y] | Max. 3072 points when expanded (2 × KV-EB1, using 64-point units) | 2560 points | 5120 points |
| Maximum number of units | Max. 64 modules | 16 units (KV-8000/7000 expansion only) 48 units (with KV-EB1) | 10 units per rack, 40 units per system | 10 units per rack, 80 units per system |
| Number of expansion racks | Max. 7 levels | Max. 3 levels with extension units (KV-EB1) (16 units per level, 48 in total) | Max. 3 | Max. 7 |
| Special I/O Units | No distinction | No distinction | Max. 96 unit numbers | |
| CPU Bus Units | No distinction | No distinction | -EIP: max. 15 / non-EIP: max. 16 | Max. 15 units |
| Pulse I/O Blocks | — | Max. 2 blocks | ||
Devices (bits)
| Item | Mitsubishi Electric R120(EN)CPU | KEYENCE KV-8000 | OMRON CJ2H-CPU68(-EIP) | OMRON CJ3M-CPU35 |
|---|---|---|---|---|
| I/O relays | X: 12288 points / Y: 12288 points (fixed, number of points in the program) | R: 32000 points total (input/output/internal auxiliary) | CIO 2560 points (160 words) CIO 0000 to 0159 | CIO 5120 points (320 words) CIO 0000 to 0319 |
| Internal auxiliary relays | M: 12288 points (default, changeable by parameter) | MR: 64000 points | W: 8192 points (512 words) CIO internal: 3200 points + 37504 points | |
| Link relays | B: 8192 points / SB: 2048 points (default) | B: 32768 points | Data link relays 3200 points (200 words) | |
| Latch / holding relays | L: 8192 points (default) | LR: 16000 points | H: 8192 points (512 words) | |
| Special relays (system) | SM: 4096 points (fixed) | CR: 1280 points | A: 31744 read-only points / 16384 read/write points | |
| Temporary relays | — | TR: 16 points | ||
| Other relays | Annunciator F: 2048 points / edge relay V: 2048 points Step relay S: 0 points (default) FX/FY: 16 points each | — | Synchronous data link 1536 points CPU Bus Units 6400 points / Special I/O Units 15360 points DeviceNet 9600 points | Serial PLC Link 1440 points Pulse I/O inputs 20 / outputs 12 points EtherCAT remote 2368 points CPU Bus Units 6400 points / Special I/O Units 15360 points DeviceNet 9600 points |
Devices (words)
| Item | Mitsubishi Electric R120(EN)CPU | KEYENCE KV-8000 | OMRON CJ2H-CPU68(-EIP) | OMRON CJ3M-CPU35 |
|---|---|---|---|---|
| Timers | T: 1024 points / LT: 1024 points / ST: 0 points / LST: 0 points (default) Low-speed 1 to 1000 ms / high-speed 0.01 to 100 ms / long 0.001 to 1000 ms | T: 4000 points (32-bit) 1 ms / 10 ms / 100 ms / 10 μs timers | 4096 points T0000 to T4095 | |
| Counters | C: 512 points / LC: 512 points (default) | C: 4000 points (32-bit) | 4096 points C0000 to C4095 | |
| Data memory | 18432 words | 65535 words | 32768 words | |
| Extended data memory | (Reference) Refresh data register RD: 524288 points (max. 1048576 points) | 65535 words | 819200 words (32768 words × 25 banks) | 327680 words (32768 words × 10 banks) |
| File registers | R/ZR: 0 points (default, changeable by parameter) | FM/ZF: 524288 words | — (EM can be converted to file memory) | |
| Link registers | W: 8192 points / SW: 2048 points (default) | W: 32768 points (16-bit) | — | |
| Temporary memory | — | TM: 512 points (16-bit) | — | |
| Index registers | Z: 20 points (max. 24) / LZ: 2 points (max. 12) | Z: 23 points Z1 to Z23 (32-bit) *Z11 to Z23 reserved by the system | IR0〜15 | |
| Pointers / nesting | P: 16384 points (max. 32768) / I: 1024 points (fixed) N: 15 points | CALL nesting up to 16 levels / FB nesting up to 8 levels | FB nesting up to 8 levels | |
| Control memory | — | CM: 7600 points (16-bit) | — | |
Variables
| Item | Mitsubishi Electric R120(EN)CPU | KEYENCE KV-8000 | OMRON CJ2H-CPU68(-EIP) | OMRON CJ3M-CPU35 |
|---|---|---|---|---|
| Variable types | System / local / global labels | Global variables / local variables | Local / global / network variables (tags) | |
| Maximum number of definitions | Label area 220 KB (capacity-dependent) | 100,000 | Not specified | Not specified |
| Number of registered network variables (tags) | Not specified | Not specified | Max. 20,000 | Max. 10,000 |
| Maximum size of one variable | Not specified | Max. 589823 words per array | 32K words | |
| Data type | Not specified | BOOL/ UINT/INT/UDINT/DINT/ REAL/LREAL/ STRING/TIMER/COUNTER/ ARRAY/structure/FB | BOOL/ UINT/UDINT/ULINT/ INT/DINT/LINT/ BCD/ REAL/LREAL/ CHANNEL/NUMBER/ WORD/DWORD/LWORD/ STRING/TIMER/COUNTER/ structure | |
| Structures | Not specified | Max. 800 definitions / max. 500 members / 8 nesting levels | User-defined types (structures) | |
| Arrays | Not specified | Max. 8 dimensions / max. 589823 elements per dimension | 1 dimension / max. 32000 elements | |
| Function block definitions / max. instances | Not specified | Not specified | 2048 ／ 2048 | |
| Max. length of variable names / comments | Not specified | 128 characters | Tag names max. 255 bytes (UTF-8) | |
Built-in ports
| Item | Mitsubishi Electric R120(EN)CPU | KEYENCE KV-8000 | OMRON CJ2H-CPU68(-EIP) | OMRON CJ3M-CPU35 |
|---|---|---|---|---|
| USB (peripheral) port | USB2.0 High Speed（miniB） | USB 2.0 B connector / max. 480 Mbps | USB 2.0 B connector / max. 12 Mbps | USB 2.0 Type-C / max. 12 Mbps |
| Serial port | — | RS-232C (0.3 to 115.2 kbps, max. 15 m) | ||
| Ethernet port | 100BASE-TX/10BASE-T (+ CC-Link IE Field Network Basic) | 100BASE-TX（EtherNet/IP） | 10BASE-T/100BASE-TX (-EIP only) | 10BASE-T/100BASE-TX |
| EtherCAT port | — (not built in) | |||
| CC-Link IE port | R120ENCPU only: 1000BASE-T/100BASE-TX/10BASE-T | — | ||
Built-in EtherNet/IP
| Item | Mitsubishi Electric R120(EN)CPU | KEYENCE KV-8000 | OMRON CJ2H-CPU68(-EIP) | OMRON CJ3M-CPU35 |
|---|---|---|---|---|
| Number of cyclic communication connections | — | 256 | ||
| RPI / packet interval | — | 0.5 to 10000 ms (0.5 ms units) | ||
| Permissible communications band | — | 10000 pps（@504 Byte）／5000 pps（@1444 Byte） | 6,000〜12,000 pps | 12,000 pps |
| Max. data size per connection | — | 252 words or 722 words | ||
| Max. refresh / link data size | — | 16K words | 184,832 words per node | |
| Number of tag sets | — | 256 | ||
| Message communication Class 3 | — | 256 connections | 128 connections | |
| Message communication UCMM | — | Client 32 / server 96 | Client 32 / server 32 | |
| Multicast filter (IGMP) | — | Yes | Supported | |
| Conformance test | — | CT15 compliant | A5 compliant | CT21 compliant |
Other communication
| Item | Mitsubishi Electric R120(EN)CPU | KEYENCE KV-8000 | OMRON CJ2H-CPU68(-EIP) | OMRON CJ3M-CPU35 |
|---|---|---|---|---|
| Socket communication | Max. 16 | KV sockets, 16 in total | — (not supported on the built-in port) | TCP max. 8 / UDP max. 8 |
| Proprietary protocol | SLMP communication | Host Link / MC protocol communication | FINS/UDP supported / FINS/TCP max. 16 | |
| Modbus | Not built into the CPU (MODBUS/TCP master and slave functions of the RJ71EN71/RnENCPU) | Not built into the CPU (Modbus server function of the KV-XLE02/XCM02/XL202/XL402) | — (not supported on the built-in port) | TCP server max. 8 / UDP server supported / client (FB) max. 8 |
| FTP / mail / Web | Web server function | FTP server and client, mail send/receive, automatic clock adjustment | FTP server, automatic clock adjustment (FINS Ethernet function of the built-in EtherNet/IP) *-EIP only | FTP server, automatic clock adjustment (FINS Ethernet function of the built-in EtherNet/IP) |
Functions
| Item | Mitsubishi Electric R120(EN)CPU | KEYENCE KV-8000 | OMRON CJ2H-CPU68(-EIP) | OMRON CJ3M-CPU35 |
|---|---|---|---|---|
| Data trace / logging | Data logging function, memory dump, real-time monitor | Logging/trace function: buffer 10240 KB / max. 512 devices Operation recording function, user authentication function | Trace memory 32000 words / sampling 1 to 2550 ms | Trace memory 220000 words / sampling 1 to 2550 ms or every cycle |
| Other functions | Standard PID, database, security, inter-module synchronization, simple CPU communication | Self-diagnosis (CPU error, RAM error, etc.) | Inter-unit synchronous control function (synchronous data link, synchronous interrupt task) | Security functions (operation log, file encryption / CPU3□: secure communication, user authentication, port open/close, IP packet filter) Battery-free I/O memory backup, Pulse I/O Block support |
| Power interruption retention | Capacitor backup 3 minutes (device/label memory, clock data) | Program: flash ROM / devices: non-volatile RAM | Holding relays H etc. (battery CJ1W-BAT01) | Holding relays H etc. (battery CJ1W-BAT01 sold separately) |
| Calendar timer | Accuracy −1.00 to +1.00 s/d (0 to 55°C), automatic leap year detection | Backup approx. 15 days (approx. 5 years with KV-B1) | Battery life 5 years (25°C) | |
Comparison of IEC 61131-3 Compliant CPU Units (KV-X550 / NX502)
These controllers comply with IEC 61131-3 and are programmed mainly with variables and structures. Because their approach differs from conventional device-centric models, they are compared in a separate table.
Basic specifications
| Item | KEYENCE KV-X550 | OMRON NX502-1□00 |
|---|---|---|
| Programming languages | Ladder, ST, mnemonic | Ladder diagram (inline ST allowed), ST |
| Program structure | 4000 programs / 100000 instances | POUs (programs / function blocks / functions) 6,000 POU definitions / 48,000 POU instances, namespaces |
| Tasks / execution | Fixed-cycle modules, inter-unit synchronization (EtherCAT refresh: batch (END processing) / inter-unit synchronization) | 1 primary periodic task, up to 3 periodic tasks, up to 32 event tasks |
| Constant scan time | 0.10 to 200.00 ms (0.01 ms units) | Fixed-cycle execution in the primary periodic task |
| Fixed-cycle execution | Fixed-cycle module: 0.05 to 6000.00 ms (0.01 ms units) or 0.01 to 60.00 s | Primary periodic task period 250 μs to 8 ms (250 μs units, same as the EtherCAT communication cycle) |
Processing speed
| Item | KEYENCE KV-X550 | OMRON NX502-1□00 |
|---|---|---|
| Basic instruction execution time | Contact I/O from 0.50 ns | LD instruction 0.53 ns |
| Double-precision floating-point arithmetic | Double-precision floating-point arithmetic from 1.0 ns | Arithmetic instructions (double-precision real) 3.3 ns |
Memory capacity
| Item | KEYENCE KV-X550 | OMRON NX502-1□00 |
|---|---|---|
| Program capacity | 128 MB | 80 MB |
| CPU memory | 128 MB (project capacity + user memory capacity) | Not specified |
| Variable capacity | Total 124 MB (retained 5.5 MB) | With Retain attribute 4 MB / without Retain attribute 256 MB |
| Number of variables | Total 200,000 (retained 100,000) | With Retain attribute 40,000 / without Retain attribute 360,000 |
| Device capacity | 1.5 MB (KV-compatible devices) | — (no devices; memory for CJ-series Units is used by AT specification of variables) |
| Memory card | microSD | SD/SDHC（2 GB／4 GB／16 GB） |
Variables and data types
| Item | KEYENCE KV-X550 | OMRON NX502-1□00 |
|---|---|---|
| Data type | BOOL/ UINT/ INT/ UDINT/ DINT/ REAL/ LREAL/ TIME/ STRING/ ARRAY/ structure/ union/ function block | BOOL/ BYTE/ WORD/ DWORD/ LWORD/ INT/ SINT/ DINT/ LINT/ UINT/ USINT/ UDINT/ ULINT/ REAL/ LREAL/ TIME/ DATE/ TIME_OF_DAY/ DATE_AND_TIME/ STRING Derived data types: structure/ union/ enumeration |
| Number of user-defined data types | Structures and unions: max. 8000 definitions | 8,000 data types |
| Structures | Max. 2048 members / max. 8 nesting levels | Max. 2048 members / max. 8 nesting levels / member offsets can be specified |
| Unions | Supported (same number of definitions and members as structures) | Max. 4 members (BOOL/BYTE/WORD/DWORD/LWORD) |
| Enumerations | Not specified | Supported |
| Arrays | Max. 8 dimensions / max. 1040187392 elements per dimension Max. 65011712 words per array | Max. 3 dimensions / max. 65535 elements Arrays of FB instances supported |
| Array subscripts | Devices / constants / variables / expressions (expressions in ST only) | Not specified |
Devices
| Item | KEYENCE KV-X550 | OMRON NX502-1□00 |
|---|---|---|
| Bit devices | R: 32000 points / B: 32768 points / MR: 64000 points / LR: 16000 points / CR: 1280 points | CIO: 0 to 6,144 words / WR: 0 to 512 words / HR: 0 to 1,536 words (memory for CJ-series Units) |
| Timers / counters | T: 4000 points / C: 4000 points (32-bit) | — (used as instances of timer and counter instructions) |
| Data memory | DM: 65535 words | DM: 32,768 words (memory for CJ-series Units) |
| Extended data memory | EM: 65535 words | EM: 32,768 words × 25 banks (memory for CJ-series Units) |
| File registers | FM: 32768 words / ZF: 524288 words | — |
| Other | W: 32768 points / TM: 512 points / Z: 10 points / CM: 7600 points | System-defined variables |
Built-in ports
| Item | KEYENCE KV-X550 | OMRON NX502-1□00 |
|---|---|---|
| Ethernet port | PORT1: general-purpose Ethernet PORT2: general-purpose Ethernet + EtherNet/IP 100BASE-TX / 1000BASE-T (automatic MDI/MDI-X switching) | PORT1 and PORT2: built-in EtherNet/IP 10BASE-T / 100BASE-TX / 1000BASE-T |
| EtherCAT port | PORT3: EtherCAT master (100BASE-TX) | |
| USB port | USB Type-C | Not specified |
Built-in EtherNet/IP
| Item | KEYENCE KV-X550 | OMRON NX502-1□00 |
|---|---|---|
| Number of cyclic communication connections | 256 (total with Class 3) | 64 per port, 128 in total |
| RPI / packet interval | 0.5 to 10000 ms (0.5 ms units) | 1 to 10,000 ms (1 ms units) |
| Permissible communications band | 10000 pps（@504 Byte）／5000 pps（@1444 Byte） | 20,000 pps (including heartbeat) |
| Max. data size per connection | 504 bytes or 1444 bytes | 1,444 bytes |
| Max. refresh / link data size | Variables: 370688 words / devices: 32767 words | 92,416 bytes per port, 184,832 bytes in total |
| Number of tag sets | Not specified | 64 per port, 128 in total |
| Message communication Class 3 | Server 256 (total with cyclic), tags can be specified | 128 per port, 256 in total (client + server) |
| Message communication UCMM | Client 32 simultaneous / server 96 simultaneous | Client 32 per port (64 total) / server 32 per port (64 total) |
| Multicast filter | Yes | Supported (IGMP client) |
| CIP Safety | Not supported | Routing supported (max. 128 connections) |
Built-in EtherCAT
| Item | KEYENCE KV-X550 | OMRON NX502-1□00 |
|---|---|---|
| Master specifications | EtherCAT master | Class B (Feature Pack Motion Control supported) |
| Supported services | CoE (PDO communication, SDO communication) *VoE, FoE, EoE, FSoE, AoE and SoE are not supported | CoE (process data communication, SDO communication) |
| Synchronous communication | DC（Distributed Clock） | |
| Physical layer / baud rate | 100BASE-TX／100 Mbps | |
| Duplex mode | Auto | |
| Topology | Line (daisy chain), star, ring (junction redundancy) | Line, daisy chain, branching, ring |
| Transmission media | Category 5e compliant STP cable | Category 5 or higher twisted-pair cable (double-shielded cable recommended) |
| Max. distance between nodes | 100 m | |
| Max. number of nodes (slaves) | 512（KV-X530：256、KV-X520：192） | 256 |
| Communication cycle | 62.5 μs to 10 ms (1 ms steps above 2 ms) | 250 μs to 8 ms (250 μs units) |
| Max. process data size | IN 11,472 bytes / OUT 11,472 bytes | |
| Max. process data size per node | IN 1,434 bytes / OUT 1,434 bytes | |
| Max. message size | 1018 Byte | Not specified |
| Synchronization jitter | Not specified | 1 μs or less |
| Max. number of motion control axes | 256 axes (KV-X530: 64 axes, KV-X520: 32 axes) | 16 to 256 axes (depends on model: NX502-1300: 16 axes to 1700: 256 axes) |
| Other functions | Refresh timing: batch (END processing) / inter-unit synchronization, topology check | Network scan, enable/disable slaves, disconnect/reconnect slaves |
Other communication
| Item | KEYENCE KV-X550 | OMRON NX502-1□00 |
|---|---|---|
| Socket communication | 64 in total (TCP/UDP, total for ports 1 and 2) | TCP sockets 60 / secure sockets 60 (TLS 1.2) |
| Modbus | Modbus/TCP server and client (system function) | Modbus TCP / Modbus RTU protocol instructions |
| OPC UA | Server: max. 20 sessions, max. 200000 published variables Client: max. 32 connections | Server: max. 5 sessions, max. 10,000 published variables |
| Proprietary protocol | Host Link, MC protocol, KV protocol (KVS connection (TLS), etc.) | CIP communication instructions, no-protocol communication instructions |
| FTP / clock / other | FTP server and client, automatic clock data adjustment (NTP), BOOTP | FTP server and client, automatic clock adjustment (NTP), SNMP agent, DB Connection Service |
Functions
| Item | KEYENCE KV-X550 | OMRON NX502-1□00 |
|---|---|---|
| Data trace | Not specified | 4 simultaneous traces, 10000 records, 192 sampled variables |
| Power interruption retention | Program: flash ROM / variables and devices: non-volatile RAM | Variables with the Retain attribute (4 MB) |
| Calendar timer | Backup capacitor approx. 15 days (approx. 5 years with KV-B1) | Accuracy −2.5 to +2.5 min per month (25°C), battery life 5 years (CJ1W-BAT01 sold separately) |
| Other functions | Self-diagnosis (CPU error, RAM error, etc.) | Security (user authentication, operation authority, protection), simulation, Automation Playback |
General specifications
| Item | KEYENCE KV-X550 | OMRON NX502-1□00 |
|---|---|---|
| Power supply voltage | 24 VDC (−15% / +20%) *KV-8000/7000 expansion only | DC24V（DC20.4〜28.8V） |
| Current consumption / power consumption | 600 mA or less (max. 3.4 A with expansion units) | 18.3 W or less |
| Ambient operating temperature | 0 to +55°C (KV-8000/7000 expansion only) | 0〜55℃ |
| Dimensions (W × H × D) | Not specified | 135 × 100 × 120 mm (including end cover) |
| Weight | Approx. 420 g (battery approx. 10 g) | 920 g or less (including end cover) |
PC-Based PLC (Reference: Beckhoff TwinCAT)
A control approach that runs a software PLC (TwinCAT 3) on a PC. Instruction execution times are not published; performance is indicated by the processor and the TwinCAT 3 platform level. For reference, the compact embedded PC CX5140 and the high-end CX2072 are listed.
| Item | Beckhoff CX5140 | Beckhoff CX2072 | |
|---|---|---|---|
| Overview | Category | Embedded PC (CX5000 series) | Embedded PC (high-end CX2000 series) |
| TwinCAT 3 platform level | Performance Plus（50） | Very High Performance（81） | |
| Processing performance | Processor | Intel Atom E3845 1.91 GHz | Intel Xeon D-1567 2.1 GHz |
| Number of cores | 4 | 12 | |
| Instruction execution time | Not published (PC-based, so performance depends on the processor and TwinCAT task settings) | ||
| Memory | Main memory (RAM) | 4 GB DDR3 (not expandable) | 8 GB DDR4 (16 / 32 / 64 GB as factory options) |
| Storage | CFast slot + microSD slot (cards sold separately) | CFast slot (card sold separately); CFast / 2.5-inch SSD via expansion modules (max. 3) | |
| Retained data | 1-second UPS (1 MB on CFast) | NOVRAM 128 kB | |
| Interfaces | Ethernet | 2×RJ45（10/100/1000 Mbit/s） | 2 × RJ45 (10/100/1000 Mbit/s) Options: 2 × RJ45 or 2 × SFP+ (1/10 Gbit/s) |
| USB | 4×USB 2.0 | 4×USB 3.0 | |
| Display | 1 × DVI-I (DVI-D / DisplayPort optional) | ||
| Fieldbus (optional) | EtherCAT master/slave, PROFIBUS, CANopen, PROFINET RT, serial | EtherCAT master (2 ports)/slave, PROFIBUS, CANopen, PROFINET RT, serial | |
| I/O connection | E-bus / K-bus (automatic detection) | Via the CX2100 power supply module | |
| Software | OS | Windows 10 IoT Enterprise (2019 / 2021 LTSC), TwinCAT/BSD, etc. | Windows 10 IoT Enterprise（2019／2021 LTSC）、Windows 11 IoT Enterprise 2024 LTSC、TwinCAT/BSD |
| General specifications | Power supply voltage | DC24V（−15%／+20%） | |
| Power consumption | Max. 16 W (max. 23 W while charging the UPS) | Max. 130 W | |
| Dimensions (W × H × D) | 142×100×92 mm | 204×99×91 mm | |
| Weight | Approx. 1095 g | Approx. 1650 g | |
| Ambient operating temperature | −25〜+60℃ | −25〜+50℃ | |
No matching items found.
Legend
| Not specified | Not listed in the referenced catalogs/manuals (this does not mean the specification does not exist) |
|---|---|
| — | No corresponding function/device, or not supported |
| Merged cells | Items with the same specification on adjacent models (columns merged) |
| CJ2H-CPU68(-EIP) | Mainly values for the -EIP models with built-in EtherNet/IP (differences from non-EIP models in parentheses) |
| R120(EN)CPU | Device points are default values (changeable by parameter; the total must fit within the device area capacity). Network specifications of the R120ENCPU are in a separate manual |
| KV-X550 | Max. EtherCAT nodes and axes are for the KV-X550 (KV-X530 / KV-X520 in parentheses) |
| NX502-1□00 | Specifications common to NX502-1300 to -1700 (only the number of motion axes differs by model). CIO / WR / HR / DM / EM are memory for CJ-series Units (used by AT specification of variables) |
| High-end overseas models | Shown in charts only. S7-1518 = CPU 1518-4 PN/DP (6ES7518-4AP00-0AB0, FW V2.9), ControlLogix L85E = 1756-L85E, Modicon M580 = BMEP586040 |
| PC-based PLCs | Beckhoff embedded PCs run TwinCAT on a PC, so instruction execution times are not published. Memory is PC RAM (GB) |
| ns／μs | OMRON instruction execution times converted from μs to ns (0.016 μs = 16 ns) |
Sources
- KEYENCE: KV-8000 catalog, KV-8000 Series User's Manual (084A15), KV-X550 data sheet, KV-X Series EtherNet/IP Function User's Manual, KV-X Series EtherCAT Communication Function User's Manual
- OMRON: CJ2 catalog (SBCA-058), CJ3M CPU Unit catalog (SBCA-152), CJ2/CJ3 CPU Unit Software User's Manual (SBCA-350), NX5 catalog (SBCA-138)
- Siemens: CPU 1518-4 PN/DP data sheet (6ES7518-4AP00-0AB0)
- Rockwell Automation：ControlLogix and GuardLogix Controllers Technical Data（1756-TD001）、Estimated Logix 5000 Controller Instruction Execution Times（LOGIX-RM002）
- Schneider Electric: BMEP586040 product data sheet
- Beckhoff: CX5140 / CX2072 product pages (technical data)
- Mitsubishi Electric: MELSEC iQ-R Series catalog (L(NA)08297-AC), MELSEC iQ-R Programmable Controller CPU Module User's Manual (SH-082487), MELSEC iQ-R Module Configuration Manual (SH-081222)
- This page summarizes information from manufacturer documentation. Always check the latest catalogs and manuals when selecting or replacing models.
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