Omron CQM1H-CPU51 CQM1H Series CPU Unit

SKU CQM1H-CPU51

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12-month warranty
Free returns within 30 days

Manufacturer: Omron
Product No.: CQM1H-CPU51
Country of origin:Japan
Product Type: PLC CPU Modules
Payment: T/T, Western Union
Weight: 7000g
Dimensions: 110 mm x 107 mm x 130 mm
Shipping port: Xiamen
Warranty: 12 months

Description

Designed for decentralized machine control and standalone automation architectures, the Omron CQM1H-CPU51 serves as a reliable central processing unit within the legacy CQM1H PLC family. This controller integrates processing capabilities with modular expandability, supporting up to 512 I/O points and hosting two slots for optional inner boards. Standard communication interfaces include an onboard RS-232C port and a dedicated peripheral port, facilitating direct PC-based ladder logic programming and human-machine interface (HMI) integration.

Features

7.2K-word program memory capacity and 6K-word data memory (DM) allocation.
Two inner board slots for expanding serial communications, high-speed counters, or analog I/O capabilities.
Integrated RS-232C (9-pin) and peripheral communications ports.
Support for up to 512 external I/O points via modular expansion blocks.
DIN-rail mountable form factor matching standard industrial control enclosures.

Applications

Packaging and labeling machinery.
Material handling and conveyor control systems.
Small-to-medium scale assembly automation lines.
Legacy control panel retrofits and system migrations.

Technical Specifications

Parameter	Specification
Manufacturer	Omron
Model Number	CQM1H-CPU51
Series	CQM1H Series
Program Capacity	7.2K words
Data Memory (DM)	6K words
Onboard Communications	1x RS-232C (D-Sub 9-pin), 1x Peripheral Port
Inner Board Slots	2 Slots
Max I/O Points	512 Points
Internal Current Consumption	950 mA at 5 VDC
Mounting Type	35mm DIN Rail
Operating Temperature	0 to 55 degC
Shipping Weight (Calculated)	0.65 kg
Package Dimensions (Calculated)	110 mm x 107 mm x 130 mm

Connections and Interfaces

Connector Pin / Terminal	Function / Circuit Assignment
RS-232C Pin 1	FG (Frame Ground)
RS-232C Pin 2	SD (Send Data / TXD)
RS-232C Pin 3	RD (Receive Data / RXD)
RS-232C Pin 4	RS (Request to Send / RTS)
RS-232C Pin 5	CS (Clear to Send / CTS)
RS-232C Pin 9	SG (Signal Ground)

Empirical Engineering Insights

Alternative Models & Compatibility

The CQM1H-CPU51 can serve as a direct replacement or upgrade path for older CQM1-CPU41 or CQM1-CPU45 modules. However, note that while base I/O modules remain physically compatible, user programs must be recompiled in CX-Programmer due to minor architecture differences in memory allocation and standard system instruction structures.

Application Pitfalls & Engineering Notes

When utilizing both inner board slots, thermal dissipation requirements in enclosed control panels scale up significantly. Maintain at least 20mm of clearance above and below the PLC assembly to prevent localized overheating, which can degrade the service life of internal backup batteries or lead to intermittent memory faults.

Commissioning & Wiring Tips

For connection to modern programming PCs without legacy DB9 serial ports, utilize a high-quality USB-to-Serial converter (such as the CS1W-CIF31) connected directly to the CQM1-CIF02 cable. Verify the DIP switch settings on the front panel of the CPU (specifically SW5) to ensure it is configured to receive Host Link communications before attempting online verification.

Installation Guidelines

CRITICAL WARNING

Always completely isolate the system power supply before inserting or removing the CPU unit, inner boards, or expansion modules. Failing to do so can result in electrostatic discharge damage to internal ASIC processors or corruption of the CPU's EEPROM data block.

1

Securely mount the CPU onto the 35mm DIN rail, ensuring that the heavy-duty yellow slide locks fully engage and secure the module to the track.

2

Install the adjacent power supply unit (e.g., CQM1-PA203) and align the side connector pins perfectly with the CPU before locking the unit slides.

3

Verify the front panel DIP switch configuration settings against your target Host Link or Peripheral communication parameters prior to system initialization.

4

Ensure the functional ground (FG) terminal on the connected power supply is terminated to a low-impedance earth ground to prevent field noise issues.

FAQ

Can I use standard CQM1 expansion I/O units with the CQM1H-CPU51?

Yes. The CQM1H-CPU51 is backward-compatible with legacy CQM1-series expansion I/O modules, allowing you to scale up to its 512-point maximum limit.

What is the function of the two inner board slots on this CPU module?

The slots allow you to install specialized functional modules, such as serial communication boards (e.g., CQM1H-SCB41) or high-speed counter boards, directly into the CPU housing.

How do I resolve a blinking 'ERR/ALM' indicator on the faceplate?

A blinking error LED typically indicates a non-fatal error, such as a low backup battery or a minor program mismatch. Connect using CX-Programmer to read the specific system error log code.

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Global Express Shipping

Standard Delivery: 4-6 Business Days via DHL, FedEx, and UPS.
Express Dispatch: Same-day dispatch for in-stock orders placed before 2:00 PM (GMT+8).
Worldwide Coverage: Serving over 150 countries, including rapid delivery to Saudi Arabia and UAE.

Returns & Warranty

30-Day Guarantee: Returns accepted for in-stock products in original, factory-sealed packaging.
12-Month Warranty: Every industrial component is backed by our professional technical warranty.

Orders are processed and delivered Monday-Friday (excluding public holidays).

For full eligibility, restocking fees, and international return details, please view our official Refund & Return Policy .

TECHNICAL SPECIFICATIONS

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