Omron CQM1-TC102 4-Loop Temperature Control Unit for CQM1/CQM1H PLC Systems
The Omron CQM1-TC102 is a high-function temperature control unit designed for the CQM1 and CQM1H series programmable logic controller systems. This special I/O unit provides direct temperature measurement and control for up to four independent loops, integrating the functionality of four separate temperature controllers into a single PLC module. The CQM1-TC102 accepts direct input from Pt100 and JPt100 platinum resistance thermometers and provides open-collector PNP pulse outputs for driving solid-state relays or contactors controlling heating elements. The unit features built-in PID control with auto-tuning, heater burnout alarm detection, and a sampling period of 500 ms.
Key Specifications
Model: CQM1-TC102 Temperature Control Unit
Product Series: CQM1/CQM1H Special I/O Unit
Control Loops: 4 loops
Temperature Sensor Input: Pt100, JPt100 platinum resistance thermometer
Control Output: Open-collector PNP output (pulse)
Control Method: 2-degree-of-freedom PID control with auto-tuning
Sampling Period: 500 ms
Temperature Range (Pt100/JPt100): 99.9°C to 450.0°C
Heater Burnout Alarm: Available for 2-loop configuration
Termination Style: Screw terminal
Mounting: DIN rail mount
Series: CQM1
Integrated Temperature Control Functionality
The CQM1-TC102 integrates the full functionality of four temperature controllers into a single PLC unit, providing significant space savings compared to using external temperature controllers. The unit accepts direct input from Pt100 and JPt100 platinum resistance thermometers, eliminating the need for separate temperature transmitters or signal conditioners. The built-in 2-degree-of-freedom PID control provides precise temperature regulation with reduced overshoot and improved response compared to conventional PID algorithms. The auto-tuning (AT) function automatically calculates optimal PID parameters based on the thermal characteristics of the controlled system, simplifying setup and commissioning.
Temperature Range and Accuracy
The CQM1-TC102 supports temperature measurement and control from 99.9°C to 450.0°C with Pt100/JPt100 inputs, covering the typical range for industrial heating applications such as plastic processing, heat treating, and packaging. The sampling period of 500 ms provides responsive control for thermal systems, with the PID algorithm updating the output based on the measured temperature at regular intervals. The unit can be configured for 4-loop temperature control or 2-loop temperature control, with the 2-loop configuration additionally providing a heater burnout alarm function for each loop.
Heater Burnout Alarm Function
When configured for 2-loop temperature control, the CQM1-TC102 provides a heater burnout alarm function that monitors the current flowing to the heating element and detects abnormal conditions. This feature is essential for applications where heating element failure could lead to product quality issues or process interruptions. The alarm output can be used to trigger visual indicators, sound alarms, or initiate corrective actions through the PLC program. The heater burnout alarm enhances process reliability and simplifies maintenance by providing early warning of potential heating element degradation.
PLC Integration and Command-Based Control
The CQM1-TC102 is fully integrated into the CQM1/CQM1H PLC system as a Special I/O Unit. Parameters can be set and data can be read from the temperature control unit by transferring commands from the PLC CPU, using standard move and instruction operations. The user program can write setpoint values, read current process temperatures, monitor alarm status, and adjust PID parameters as needed. The integration allows the temperature control unit to function as an integral part of the overall machine control strategy, coordinating with other machine functions such as motion control, material handling, and quality inspection.
Industrial Applications
The Omron CQM1-TC102 temperature control unit is deployed across a wide range of industrial applications requiring precise temperature regulation. In plastic processing, it controls barrel and mold temperatures for injection molding and extrusion machines. In packaging machinery, it regulates sealing jaw temperatures for consistent seal quality. In heat treating furnaces, it controls workpiece temperatures for annealing, hardening, and tempering processes. In food processing, it maintains cooking and holding temperatures for product quality and safety. The unit's 4-loop configuration allows simultaneous control of multiple temperature zones from a single module.
Conclusion
The Omron CQM1-TC102 temperature control unit provides 4-loop temperature control with Pt100/JPt100 inputs, PID control with auto-tuning, and heater burnout alarm detection for CQM1/CQM1H PLC systems. Its integrated functionality, direct sensor input, and command-based control make it a versatile solution for industrial temperature regulation applications.
