OMRON CQM1-CPU41 – Compact PLC CPU Unit | CQM1 Series Platform
Engineering Background
The OMRON CQM1 Series represents OMRON’s proven compact programmable controller platform, engineered for discrete manufacturing and process control applications. Introduced as a high-reliability mid-range PLC, the CQM1 family has accumulated decades of field deployment across automotive assembly, food & beverage processing, semiconductor handling, and general factory automation worldwide.
Product Positioning
The CQM1-CPU41 is the CPU module at the heart of the CQM1 rack-based control system. It provides the processing core, program memory, and I/O bus management for the entire CQM1 backplane. Procurement engineers specifying a replacement or expansion CPU for an existing CQM1 installation will find the CQM1-CPU41 a direct, drop-in compatible solution with no re-engineering of the I/O rack or wiring infrastructure.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Model Number | CQM1-CPU41 |
| Manufacturer | OMRON Corporation |
| Series / Platform | CQM1 Series |
| Module Type | CPU Unit (Central Processing Unit) |
| Program Capacity | 3.2K words |
| Data Memory | 6K words (DM area) |
| I/O Points (Max) | 256 points (with expansion I/O units) |
| Execution Speed | 0.5 µs / basic instruction |
| Communication Port | RS-232C peripheral port (programming console / host link) |
| Power Supply | Supplied via CQM1 Power Supply Unit (e.g. CQM1-PA206) |
| Operating Voltage | 5 VDC (internal bus, from PSU) |
| Operating Temperature | 0 °C to 55 °C |
| Storage Temperature | -20 °C to 75 °C |
| Humidity | 10% to 90% RH (non-condensing) |
| Vibration Resistance | 10 to 57 Hz, 0.075 mm amplitude; 57 to 150 Hz, 9.8 m/s² |
| Shock Resistance | 147 m/s² (3 times each in X, Y, Z axes) |
| Degree of Protection | IP20 (panel-mount installation) |
| Weight | Approx. 260 g |
| Applicable Standards | CE, UL, cUL |
| Country of Origin | Japan |
Proven Application Environments
- Automotive Manufacturing: Body welding line sequencing, conveyor indexing, and robotic cell interlocking where deterministic scan times are critical.
- Food & Beverage Processing: Filling, capping, and labeling machine control with hygienic panel enclosures; CQM1-CPU41 operates reliably in washdown-adjacent environments when properly enclosed.
- Semiconductor & Electronics Assembly: Pick-and-place machine coordination, wafer handling, and SMT line control requiring high-speed I/O response.
- Packaging Machinery: Form-fill-seal, cartoning, and palletizing systems where compact footprint and fast instruction execution reduce machine cycle time.
- Building Automation & HVAC: Legacy BAS panels using CQM1 for chiller sequencing, AHU control, and energy management.
- MRO / Spare Parts: Direct replacement for failed CQM1-CPU41 units in installed base equipment, eliminating costly machine redesign.
Engineering Advantages
- Compact Rack Architecture: Modular backplane design allows flexible I/O expansion without rewiring; CPU slot is standardized across CQM1 rack sizes.
- High-Speed Execution: 0.5 µs per basic instruction enables tight control loops for motion-adjacent and high-frequency discrete applications.
- Extensive Instruction Set: Supports arithmetic, data transfer, comparison, PID, and communication instructions natively — reducing need for external co-processors.
- RS-232C Peripheral Port: Direct connection to OMRON Programming Console (CQM1-PRO01-E) or PC via CX-Programmer for online monitoring and program upload/download.
- Battery-Backed Memory: Program and data memory retained during power loss via onboard lithium battery (user-replaceable).
- Proven Long-Term Availability: CQM1 platform has extensive installed base; Konmask maintains verified stock of new and refurbished units to support MRO procurement cycles.
System Architecture & Signal Flow
The CQM1-CPU41 occupies the CPU slot (leftmost position) of the CQM1 backplane. The internal 5 VDC bus distributes power from the Power Supply Unit (PSU) to the CPU and all I/O modules. The CPU executes the user ladder program cyclically: Input Refresh → Program Execution → Output Refresh → Peripheral Service. I/O data is exchanged with discrete and analog I/O units via the backplane bus. Host-link or peripheral-port communications are serviced during the peripheral service phase, enabling real-time SCADA/HMI data exchange without impacting scan time determinism.
Compatible expansion units include digital I/O (CQM1-ID/OD/MD series), analog I/O (CQM1-AD/DA series), and communication units (CQM1-CLK/SCU series), all managed by the CQM1-CPU41 through the unified I/O bus.
Sourcing & Quality Verification
- Source Traceability: Units sourced directly from authorized OMRON distributors or verified industrial surplus channels with documented chain of custody.
- Incoming Inspection: Each CQM1-CPU41 undergoes visual inspection (connector integrity, label authenticity, housing condition) and functional power-on verification prior to listing.
- Counterfeit Mitigation: Konmask applies OMRON’s published authentication guidelines — label font, hologram placement, and PCB markings — to screen all incoming stock.
- Condition Grading: Units are graded as New (factory-sealed), Refurbished (tested, cleaned, warranted), or Used-Tested (functional, cosmetic wear). Grade is stated explicitly on the order confirmation.
- Warranty: 12-month functional warranty on all Konmask-verified units; DOA replacement within 7 business days.
Procurement Process
- Confirm Compatibility: Verify your existing CQM1 rack model and PSU capacity before ordering. Contact our engineering team if unsure — we will cross-reference your BOM.
- Request a Quote: For orders of 3+ units or urgent MRO requirements, email [email protected] for volume pricing and lead-time confirmation.
- Place Order: Add to cart and complete checkout. We accept T/T bank transfer, PayPal, and major credit cards. Net-30 terms available for approved corporate accounts.
- Shipping: In-stock units ship within 1–2 business days. International orders dispatched via DHL Express or FedEx International Priority with full tracking and commercial invoice.
- Customs & Documentation: We provide HS code declaration, commercial invoice, and packing list. Certificate of Origin available on request for import duty optimization.
Technical FAQ
Q: Is the CQM1-CPU41 compatible with CX-Programmer?
A: Yes. CX-Programmer (v9.x and later) supports the CQM1 series. Select “CQM1” as the device type when creating a new project. Connection via USB-Serial adapter to the RS-232C peripheral port is required.
Q: Can I replace a CQM1-CPU11 or CQM1-CPU21 with a CQM1-CPU41?
A: Yes, the CQM1-CPU41 is physically and electrically compatible with all CQM1 backplanes. The CPU41 offers larger program memory (3.2K words vs. 1K/2K on CPU11/CPU21), so existing programs will load without modification. Verify battery replacement if the unit has been in storage.
Q: What is the battery part number for the CQM1-CPU41?
A: The onboard battery is a 3.6 V lithium battery, OMRON part number CPM2A-BAT01 (or equivalent CR14250SE). Battery life is approximately 5 years at 25 °C ambient.
Q: Does Konmask provide programming or commissioning support?
A: We provide basic technical guidance (datasheet, wiring diagrams, CX-Programmer project templates) at no charge. For on-site commissioning or ladder program development, we can refer you to certified OMRON system integrators in your region.
Q: What is the lead time for out-of-stock units?
A: Typical lead time for sourced units is 5–15 business days depending on regional availability. Contact us to join the waitlist and receive priority allocation.
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