Omron CJ1W-TS561 Temperature Control/Input Unit

The Omron CJ1W-TS561 is a high-accuracy Temperature Control/Input Unit for the CJ1 and CJ2 series PLC systems. It is specifically designed to interface with Thermocouples, allowing the PLC to monitor temperature across multiple zones with high precision.

1. Key Technical Specifications

The “561” model is a 6-channel unit, providing a high density of inputs in a single CJ-series slice.

2. Wiring and Cold Junction Compensation

Temperature measurement accuracy depends heavily on the Cold Junction Compensation (CJC).

• Built-in Sensor: The TS561 has a CJC sensor mounted directly on the terminal block.

• Important: If you swap the terminal block with one from a different module, your temperature readings will become inaccurate because each block is calibrated to its specific module.

• Shielding: Use compensated thermocouple wire for the entire run and ground the shield at the PLC side to prevent electrical noise from causing “jitter” in your data.

3. I/O Allocation and Memory Map

The CJ1W-TS561 does not use standard I/O bits; it uses the Special I/O Unit (CIO) and DM (Data Memory) areas.

• Unit Number: You must set the rotary switches on the front of the module (0–95). This determines the memory address.

• CIO Area: The measured temperature values are written directly into the CIO area based on the unit number ($n = CIO 2000 + Unit No. \times 10$).

  • Channel 1: $n+1$

  • Channel 2: $n+2$ … and so on.

• DM Area: Used for configuration (selecting thermocouple type, Celsius vs. Fahrenheit, and filtering).

4. Configuration via CX-Programmer

To set up the module, you don’t necessarily need to write complex code. You can use the I/O Table and Unit Setup tool:

1. Open the I/O Table in CX-Programmer.

2. Right-click the TS561 and select Unit Setup.

3. Choose the thermocouple type (e.g., “K”) for each channel.

4. Transfer the settings to the PLC and restart the unit.