OMRON CQM1 Modules — CQM1-CPU43-V1

Technical Dossier

Product Details And Specifications

OMRON CQM1 Series: Comprehensive Module Range and Technical Overview

The OMRON CQM1 is a compact, modular programmable logic controller series that has established a significant installed base across global heavy industry sectors including petrochemical plants, pharmaceutical manufacturing, food processing lines, nuclear facility auxiliary systems, and refinery control infrastructure. Introduced in the early 1990s as a successor to the C200H family for mid-range applications, the CQM1 series offered a self-contained rack architecture with a fixed backplane, supporting up to 32 I/O modules per CPU unit depending on configuration. Its deterministic scan cycle, ladder-diagram programming via SYSMAC-CPT and CX-Programmer, and robust DIN-rail mounting made it a standard selection for OEM machine builders and process automation integrators throughout the 1990s and 2000s. Despite reaching end-of-life status, the CQM1 remains operational in thousands of legacy installations worldwide, creating sustained demand for spare parts, replacement CPUs, and I/O expansion modules.

The Evolution of CQM1 Architecture

The CQM1 series was designed around a single-rack, fixed-backplane architecture where the CPU unit integrates the power supply, processor, and I/O bus controller into one housing. Early CPU variants such as the CQM1-CPU11-E and CQM1-CPU21-E provided limited program memory (4K–8K steps) and basic I/O capacity, targeting simple machine control. The V1 revision series — including the CQM1-CPU43-V1 and CQM1-CPU45-V1 — introduced expanded program memory (up to 32K steps), extended data memory (DM), and enhanced instruction sets including floating-point arithmetic and PID control, positioning the CQM1 for more complex process applications.

Communication architecture evolved from RS-232C host link (SYSMAC WAY) in early units to peripheral port + RS-232C dual-port configurations in later CPUs, enabling simultaneous programming terminal connection and host computer supervision. The addition of dedicated communication adapter modules (e.g., CQM1-SCB41-V1) extended the platform to DeviceNet and CompoBus/S fieldbus networks, aligning the CQM1 with distributed I/O architectures prevalent in the late 1990s. The CQM1H series subsequently replaced the CQM1 with an enhanced inner board slot for function expansion, though the CQM1 backplane and I/O modules are not cross-compatible with CQM1H inner board accessories. Facilities migrating from CQM1 to current OMRON NX/NJ or CP2E platforms must account for full I/O rewiring and program conversion, as no direct migration path exists.

CQM1 Full Catalog & Functionalities (SKU List)

CPU Units

• CQM1-CPU11-E: 4K-step CPU, 512 I/O points, RS-232C host link port
• CQM1-CPU21-E: 8K-step CPU, 512 I/O points, peripheral + RS-232C ports
• CQM1-CPU41-EV1: 16K-step CPU, expanded DM, dual serial ports
• CQM1-CPU43-V1: 32K-step CPU, 6K-word DM, floating-point, PID, dual ports
• CQM1-CPU45-V1: 32K-step CPU, 6K-word DM, high-speed counter, pulse output

Digital Input Modules

• CQM1-ID211: 16-point DC 24V input module, NPN sink type
• CQM1-ID212: 16-point DC 24V input module, PNP source type
• CQM1-ID213: 32-point DC 24V input, high-density connector
• CQM1-IA121: 8-point AC 100–120V input module
• CQM1-IA221: 8-point AC 200–240V input module

Digital Output Modules

• CQM1-OD211: 16-point transistor output, NPN sink, 0.5A per point
• CQM1-OD212: 16-point transistor output, PNP source, 0.5A per point
• CQM1-OD213: 32-point transistor output, high-density, NPN
• CQM1-OA221: 8-point triac AC output, 2A per point
• CQM1-OC221: 8-point relay output, 2A per point, 250V AC

Analog & Special Function Modules

• CQM1-AD041: 4-channel analog input, 0–10V / 4–20mA, 12-bit resolution
• CQM1-DA021: 2-channel analog output, 0–10V / 4–20mA, 12-bit
• CQM1-TC001: 2-channel thermocouple input, K/J/T/E types, PID capable
• CQM1-TC101: 2-channel Pt100 RTD input, temperature control module

Communication & Adapter Modules

• CQM1-SCB41-V1: Serial communication board, RS-232C + RS-422/485 dual port
• CQM1-DRT21: DeviceNet slave adapter for CQM1 I/O expansion

Sourcing Hard-to-Find & Obsolete CQM1 Parts

OMRON officially discontinued the CQM1 series, and new production units are no longer available through authorized distribution channels. DriveKNMS maintains a dedicated inventory of tested, refurbished, and new-surplus CQM1 modules to support facilities that cannot justify a full platform migration. Our sourcing network spans manufacturer-certified refurbishers, decommissioned plant asset liquidations, and bonded warehouse stock across Asia, Europe, and North America.

For CPU units such as the CQM1-CPU43-V1, DriveKNMS provides battery replacement, firmware verification, and full functional test prior to shipment. For I/O modules, each unit undergoes point-by-point channel verification. Lead times for common SKUs are typically 3–10 business days; rare variants may require 2–4 weeks sourcing. Long-term maintenance contracts covering annual spare allocation are available for facilities with multi-unit CQM1 installations.

Quality Control for the CQM1 Range

The CQM1 backplane bus operates at 5V DC internal logic with a proprietary parallel I/O bus protocol. Quality verification for CQM1 modules at DriveKNMS follows a structured test protocol:

• CPU Units: Power-on self-test (POST) verification, program memory read/write cycle test, DM integrity check, serial port loopback test (both peripheral and RS-232C ports), RUN/STOP mode switching, and battery-backed memory retention test over 72-hour hold period.
• Digital I/O Modules: Each input point tested with calibrated 24V DC signal source; each output point loaded to 50% rated current and verified for switching response time within specification.
• Analog Modules: Full-scale linearity sweep across all channels; offset and gain calibration verified against NIST-traceable reference; channel isolation resistance measured at 500V DC.
• Communication Modules: Protocol handshake verification at all supported baud rates; bus termination resistance check; connector pin continuity and insulation resistance test.

All units ship with a test report and 12-month warranty against defects in materials and workmanship under normal operating conditions.