OMRON CQM1-TC001 Temperature Control Module

The OMRON CQM1-TC001 is a dedicated temperature control input module designed for the CQM1 series programmable logic controllers. This compact module provides two independent thermocouple input channels, enabling precise temperature measurement and monitoring in industrial processes. The CQM1-TC001 is widely used in plastic molding, packaging, heat treatment, and HVAC applications where accurate thermal data is essential for product quality and energy efficiency.

The module features high‑resolution analog‑to‑digital conversion with built‑in cold junction compensation (CJC) to ensure measurement accuracy across varying ambient temperatures. Each channel is individually configurable for thermocouple type (K or J) and can be scaled directly into engineering units within the PLC program, reducing computational overhead. The CQM1-TC001 also includes a comparison function that can trigger alarms or control outputs based on setpoint deviations.

Technical Specifications

• Number of inputs: 2 (thermocouple, differential)

• Supported thermocouple types: K (NiCr‑NiAl) and J (Fe‑CuNi)

• Temperature measuring range: K: -200°C to +1300°C; J: -100°C to +750°C

• Resolution: 0.1°C (digital) / 1°C (display)

• Accuracy: ±0.5% of full scale ±1 digit (at 25°C)

• Cold junction compensation error: ±1°C max

• Conversion time: 250 ms per channel

• Input impedance: ≥ 1 MΩ

• Isolation: Photocoupler isolation between input and PLC bus

• Internal power consumption: 5 V DC, 50 mA (from backplane)

• I/O word allocation: 2 input words (temperature data) + 1 output word (control/status)

Functional Capabilities

• Real‑time data transfer: Temperature readings are updated every scan cycle and stored in dedicated PLC memory areas for use in control logic.

• Alarm output function: Each channel can be programmed with high/low alarm setpoints, which set internal flags or energize an output unit.

• Wire break detection: The module detects an open thermocouple and sets an error flag, preventing erroneous control actions.

• Digital filtering: Programmable digital averaging (moving average) stabilizes readings in noisy environments.

Typical Applications

• Injection molding machines: Monitoring barrel and nozzle temperatures for consistent melt quality.

• Packaging sealers: Controlling heater bars and maintaining seal temperature.

• Industrial ovens and furnaces: Reading thermocouples for process temperature regulation.

• Food processing equipment: Monitoring cooking and drying temperatures.

Integration and Configuration

The CQM1-TC001 mounts directly into the CQM1 rack and is automatically recognized by the PLC. Configuration is performed using CX‑Programmer or the handheld programmer: assign the thermocouple type, enable/disable alarms, and set the averaging count. The module’s status LEDs (RUN, ERR, input status) provide visual feedback for troubleshooting. No external calibration is required, as the module retains factory calibration data.

Environmental and Safety

Operating temperature: 0°C to +55°C; storage: -20°C to +70°C. The module complies with EN 61000‑6‑2 and EN 61000‑6‑4, carries CE marking, and is UL recognized. It is suitable for pollution degree 2 installations.

Conclusion

The OMRON CQM1-TC001 temperature module offers a cost‑effective and reliable solution for integrating thermocouple inputs into CQM1‑based control systems. Its accuracy, noise immunity, and simple configuration make it a staple for temperature‑critical automation tasks.