Omron CQM1-CPU42-EV1 Compact PLC CPU Unit

Product Overview

The Omron CQM1-CPU42-EV1 is a CPU unit for the CQM1 series modular PLCs. It integrates a 24 VDC power supply, CPU, and communication port into a compact form factor. This unit is designed for small to medium-sized machine control applications, offering high-speed processing and flexible expansion capabilities. The CQM1 series is well-suited for packaging equipment, small assembly lines, and material handling systems.

Key Specifications

• Model: CQM1-CPU42-EV1

• Power Supply: 24 VDC (built-in)

• Program Memory: 7.2 K steps (RAM with battery backup)

• Data Memory (DM): 6 K words

• Extended Data Memory (EM): 6 K words × 1 bank

• I/O Capacity: 192 points (max.)

• Expansion Units: Up to 3 I/O expansion units, 3 Special I/O units

• LD Instruction Time: 0.375 μs

• Communication Port: RS-232C (9-pin D-sub)

• Built-in Clock: Yes (calendar)

• Battery: Yes (for program and data retention)

• Dimensions: 70 × 110 × 95 mm (W × H × D)

High-Performance Processing

The CPU42-EV1 features a fast execution time of 0.375 μs per basic instruction, enabling high scan rates for responsive control applications. Its 7.2 K-step program memory provides ample space for ladder logic, function blocks, and advanced algorithms. For data handling, the unit includes 6 K words of DM and 6 K words of EM, sufficient for managing recipes, counters, and machine status data.

Built-in Power Supply and Compact Design

Unlike many PLCs that require a separate power module, the CQM1-CPU42-EV1 incorporates a 24 VDC power supply capable of powering the CPU and additional I/O units (up to 1.2 A total). This reduces panel space and component count. The unit’s compact footprint (70 mm wide) allows installation in space-constrained cabinets.

I/O Expansion and Flexibility

The CQM1-CPU42-EV1 supports up to 192 I/O points by connecting up to 3 I/O expansion units (CQM1-IA/OC/ID series) and 3 Special I/O units (for analog, temperature, or high-speed counting). This modular design adapts to both simple and complex machine configurations, from 16-point systems to full 192-point systems.

Communication and Peripherals

The built-in RS-232C port supports Host Link, 1:1, or 1:N NT Link protocols, enabling connection to HMIs, host computers, and other serial devices. The port can also be used for programming via CX-Programmer or a handheld console. A battery-backed calendar clock allows time-stamped event logging and scheduled control tasks.

Industrial Applications

• Packaging machinery (fillers, sealers, labellers)

• Small conveyor systems and sorting lines

• Assembly station controllers

• Batch process control (mixing, dosing)

Conclusion

The Omron CQM1-CPU42-EV1 offers a powerful yet cost-effective CPU solution for small to medium automation projects. Its built-in power supply, high processing speed, and expansion flexibility make it a reliable choice for OEMs and system integrators.

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