OMRON CS1H-CPU63H CPU Unit

Status: Discontinued (End of Production). Only available in second-hand/spare parts market.

The CS1H-CPU63H belongs to the SYSMAC CS1H high-performance rack-mounted PLC, equipped with a 32-bit RISC processor. Designed for medium-to-large machines, production lines and process control, it supports multiple expansion racks and a large number of special modules.

✅ Core Specifications

📌 Model Code Definition

CS1: CS-series PLC

H: High-performance CPU (CS1G = standard type)

CPU: CPU Unit

63: Performance grade, 63 = 20K steps; higher grades:64(30K)/65(60K)/66(120K)/67(250K)

Suffix H: H-version hardware

🧩 Hardware Architecture & Applications

1. Rack installation: CS1W-BC series CPU backplane + expansion backplanes; CPU plugged into main backplane.
2. Supported modules: Digital I/O, analog AD/DA, high-speed counter, positioning modules, communication units (Controller Link, DeviceNet, serial units, etc.)
3. Typical applications: Injection molding, stamping, assembly lines, large packaging machinery, HVAC, water treatment, legacy production line retrofits.
4. Programming Software: CX-Programmer (CX-P); supports Ladder Diagram, ST structured text, function blocks.

🔁 Official Recommended Replacement Models

Two upgrade options from Omron:

1. CJ2H-CPU64 (in-family replacement, minimum migration effort, preferred)
2. NX102-9000 (new-generation NX series, Sysmac Studio software, full-platform upgrade)

Migration Notes: Memory addresses and instructions are mostly compatible between CS1 and CJ2H, but rack configuration, special unit parameters and communication unit settings need re-verification. NX series requires full program reconstruction.

⚠️ Common Failures & Maintenance Notes

1. Battery alarm (A40204): Built-in lithium cell failure; DM/EM/HR data lost after power-off. Replace battery while PLC remains powered.
2. ERC red fatal error: RAM fault, WDT watchdog timeout, I/O unit abnormality, poor backplane connector contact.
3. Failed online connection: Check peripheral port cable, PLC mode switch, CX-P communication driver and CPU firmware version.
4. Second-hand unit inspection checklist:

Power-on RUN/ERR LED status

Battery voltage and RTC clock accuracy

Memory read/write verification, program upload/download test

Backplane connector oxidation and corrosion check

📎 Common Spare Parts List

Backplane: CS1W-BC053/BC083/BC103

Power Supply: CS1W-PA204/PA207

Expansion Cable: CS1W-CN series

Battery: CS1W-BAT01

Communication Protocols Supported by OMRON CS1H-CPU63H

Important distinction: Protocols on CPU native ports (no extra module required) and protocols via optional CS1W communication boards / units (add-on hardware required). All network messaging is based on FINS (Omron FA Information Service Protocol).

1. Native CPU Ports (Peripheral Port + Built-in RS232C)
2. Host Link: Traditional Omron serial protocol, used for CX-P and HMI/SCADA to read/write PLC and online programming. Supported on both RS232C and peripheral port.
3. NT Link: Dedicated serial protocol for legacy Omron NT HMIs, supports 1:1 /1:N multi-panel connection.
4. No-Protocol Communication (TXD/RXD): Free serial transmission of raw ASCII data, for instruments, barcode scanners, weighing transmitters.
5. Serial FINS: Run FINS commands over serial ports for PLC-to-PLC serial interconnection.

Physical interfaces: Mini-DIN peripheral port, D-Sub9 RS-232C. No built-in Ethernet port.

2. Optional Communication Boards (Front CPU slot: CS1W-SCB21/SCB41)

RS232C / RS422A/485

Host Link, NT Link, No-Protocol, Protocol Macro (PMCR). Predefined third-party device protocols (Modbus RTU, custom instrument protocols) configured in CX-Protocol.

Serial FINS

3. Optional Rack-mounted Communication Units (CS1W modules plugged onto backplane)

3.1 Ethernet Unit CS1W-ETN21 (standard Ethernet, NOT EtherNet/IP)

FINS/TCP, FINS/UDP

TCP/IP, UDP/IP Socket (custom socket communication)

FTP service (file upload/download), SMTP email, SNTP time synchronization, Web server

3.2 EtherNet/IP Unit CS1W-EIP21

EtherNet/IP (CIP protocol, multi-vendor industrial Ethernet)

Also supports FINS/TCP, FINS/UDP, SNMP, FTP, SNTP

3.3 Controller Link CS1W-CLK23/CLK53 (Omron factory LAN)

Controller Link token bus network, N:N data link + FINS messaging for large-volume PLC-to-PLC data sharing and FinsGateway SCADA access.

3.4 DeviceNet CS1W-DRM21

DeviceNet (CIP-based fieldbus, remote I/O, third-party sensors and inverters)

3.5 CompoNet CS1W-CRM21

CompoNet, Omron bit-level high-speed fieldbus for sensors and actuators

3.6 SYSMAC LINK / SYSMAC NET (legacy Omron fiber network, obsolete)

3.7 Serial Unit CS1W-SCU21/SCU41

RS232/485, Host Link, Protocol Macro, No-Protocol, Modbus RTU (implemented via Protocol Macro)

3.8 PROFIBUS-DP Master Unit CS1W-PRM21

PROFIBUS-DP, connect to DP slave instruments and variable frequency drives

4. Third-party Protocols Realized via Protocol Macro PMCR (Serial)

Not hard-coded native CPU protocol; parsed inside the communication board/unit.

Modbus RTU (Master / Slave)

Custom ASCII protocols for weighing, barcode, inverter and instrument devices

❗Important: CS1H-CPU63H does NOT natively support Modbus. Modbus RTU requires SCB/SCU serial board plus Protocol Macro. Modbus TCP requires ETN/EIP unit plus custom Socket programming.

5. Protocol Selection Quick Reference

PC programming / old HMI: Host Link / NT Link (use native serial port)

Serial instruments: No-protocol TXD/RXD or Protocol Macro (SCB board)

Large data exchange between PLCs: Controller Link

Industrial Ethernet / SCADA: ETN21(FINS) or EIP21(EtherNet/IP)

Remote I/O, sensor bus: DeviceNet / CompoNet

Siemens DP devices: CS1W-PRM21 PROFIBUS-DP unit

CS1H-CPU63H｜Modbus RTU Configuration via Protocol Macro

Hardware Prerequisite: CS1W-SCB21/SCB41 (CPU front serial board) OR CS1W-SCU21/SCU41 (rack serial module).

CPU native serial port cannot run Protocol Macro for Modbus RTU. SCB/SCU hardware is mandatory.

Software: CX-Protocol (included in CX-One suite) + CX-Programmer

1. Operating Principle

Protocol Macro (PMCR) executes communication sequences inside the SCB/SCU module. The CPU invokes pre-downloaded communication sequences with `PMCR(260)`. The module automatically handles packet assembly, transmission, response waiting, CRC16 checksum and parsing, then stores received data into PLC DM memory.

✅ Capability: Modbus RTU Master (read/write holding registers, input registers, coils, discrete inputs)

⚠️ Limitation: No native Modbus ASCII support. Max 20 protocol sets; max 60 sequences per protocol.

2. Hardware & DIP Switch Setup
3. Unit Number for SCU: Set via DIP switch (0~F), must match hardware configuration inside CX-P. SCB boards have no unit number and use fixed port addressing.
4. Port Mode: Set port to Protocol Macro, NOT Host Link or No-Protocol.
5. Serial Parameters (Modbus RTU standard)

8bit, 1 stop bit, no parity (8,N,1). Odd/even parity is also available.

Baud rate: 1200~115200bps, must match Modbus slave exactly.

4. RS485 Wiring: Enable terminating resistors at both bus ends; shield grounded at single point; do not reverse A/B wires, connect A to A and B to B.
5. CX‑Protocol Project Creation Steps
6. Create new protocol project, select CS-series SCB/SCU, create new Sequence.
7. Create Message frames to define Modbus RTU packets:

Frame structure: Slave Address(1B)+Function Code(1B)+Data Field+CRC16(2B)

Enable automatic CRC calculation in CX-Protocol; manual CRC entry is unnecessary.

Common function codes: 01 Read Coils, 02 Read Discrete Inputs, 03 Read Holding Registers, 04 Read Input Registers, 05 Write Single Coil, 06 Write Single Register, 10H Write Multiple Registers

3. Timing parameter configuration (critical)

Send&Receive: transmit then wait for response

Response timeout: normally 200~500ms (increase for long-distance / low baud rate instruments)

Retry count: 0~3; set to 1 retry for noisy field environments

Frame interval: Modbus RTU requires 3.5 character silent interval. CX-Protocol wait time must satisfy this timing requirement.

4. Compile protocol macro and download it into SCB/SCU module (NOT download to CPU program).

Note: Protocol macro is stored inside serial board/module, not CPU. The CPU only calls sequences. Older modules lose protocol macro after power cycle, re-download required after power up, or use flash-version modules.

4. PLC Programming: PMCR Instruction Call

Instruction format: `PMCR(260) S1 S2 D`

S1: Protocol number + Sequence number (defined in CX-Protocol)

S2: Start address of transmit data (DM area, stores variable parameters: slave address, register start index, length)

D: Start address for received data storage (DM area, slave response saved here)

Associated Status Word

After PMCR execution, status code is written right after D channel:

0000: Completed normally

0001: Timeout

0002: Receive frame error

0003: CRC check error

0004: Sequence not found

Programming Tip: Trigger PMCR with rising edge, do NOT keep PMCR ON continuously. Wait for completion flag OFF before triggering next poll to avoid bus collision.

5. Common Pitfalls & Troubleshooting
6. A/B reversed wiring: No response, PMCR reports timeout (most frequent field issue).
7. Protocol macro not downloaded into SCB/SCU: PMCR returns error. Many users only download ladder program and skip protocol macro download in CX-Protocol.
8. Timing fails 3.5 character gap: Intermittent packet loss and CRC errors, more likely at low baud rates.
9. Multi-slave polling without interlock: Simultaneous transmission causes bus conflict.
10. Wrong port mode selected: Port set as Host Link, PMCR will not execute.
11. Mismatched unit number: SCU unit number in CX-P hardware configuration inconsistent with physical DIP setting.
12. Alternative Solutions for CS1H
13. Protocol Macro PMCR: Modbus RTU master, supports complex polling. Disadvantage: requires CX-Protocol, protocol stored on module and lost on power cycle (older hardware).
14. No-Protocol TXD/RXD: Manually build packets and calculate CRC inside ladder code. Large programming workload; suitable only for single simple device, hard to maintain with multiple slaves.
15. Add ETN21 Ethernet unit: Socket programming to implement Modbus TCP, no RTU support.
16. Reference Manuals

W340 CS1W-SCB21/SCB41 Serial Communication Board Manual

W341 CS1W-SCU21/SCU41 Serial Communication Unit Manual

CX-Protocol Operation Manual W342