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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