OMRON CQM1H series modular PLC

Product positioning and core advantages

positioning

Omron CQM1H is a compact modular PLC used for single machine and distributed device control.

Compared to CQM1, I/O, program, and DM capacity have doubled, and speed has increased by 25%.

Core strengths

No bottom plate side insertion structure, flexible installation, space saving

CPU 51/61 supports 2 internal boards with highly integrated functions

High speed processing: basic instruction 0.375 μ s, special instruction 17.7 μ s

Powerful networks: Controller Link, DeviceNet, Profibus DP

Protocol macro: One click docking with serial devices such as barcodes and thermostats

Fully compatible with CQM1 modules and programs, upgrading smoothly

CPU Model and Specifications (Core Table)

Model Maximum I/O Program Capacity DM/EM Built in Input Internal Board Controller Link

CPU 11 256 3.2K 3K/-16 points not supported Not supported

CPU 21 256 3.2K 3K/-16 points not supported Not supported

CPU 51 512 7.2K 6K/-16 points support 2 blocks support

CPU61 512 15.2K 6K/6K 16 point support 2 blocks support

System configuration rules

Connection method: Side bus connector splicing, without bottom plate

Maximum number of units: 11 (I/O+dedicated units)

Expansion configuration: Expand in two groups through IC101+II101

Power supply: 5V bus ≤ 30W, total current ≤ 3.0A

Power supply unit

Model Input/Output 5V 24V Auxiliary

PA203 100~240VAC 3.6A —

PA206/216 100~240VAC 6A 0.5A

PD026 24VDC 6A —

6 types of CPU internal boards (only supported by CPU 51/61)

CQM1H-CTB41 high-speed counting board

4-channel, 500kHz, linear/circular counting

CQM1H-PLB21 Pulse I/O Board

2-channel input 50kHz, 2-channel output 50kHz

CQM1H-ABB21 Absolute Value Encoder Board

2 channels, Gray code, 4kHz

CQM1H-AVB41 Analog Quantity Setting Board

4-channel potentiometer setting, 0~200

CQM1H-MAB42 Analog I/O Board

4 inputs and 2 outputs, ± 10V~0~20mA

CQM1H-SCB41 serial communication board

RS232 + RS422/485， Protocol Macro

I/O and dedicated unit system

1. Basic I/O unit

Input: DC12/24V (8/16/32 points); AC100/200V (8 o’clock)

Output: Relay (2A), transistor (0.1~2A), thyristor (0.4A)

2. Specialized Unit

Analog quantity: AD042 (4 inputs), DA022 (2 outputs)

Temperature: TC001~TC304, thermocouple/platinum resistance, 2/4 loop PID

Motion: LSE01/02 linear sensor interface

Safety: SF200 safety relay unit

Remote I/O: B7A interface unit, up to 500m away

3. Communication unit

CQM1H-CLK21：Controller Link，2Mbps/500m， 32 nodes

CQM1-DRT21: DeviceNet slave, 16 in 16 out

CQM1-PRT21: Profibus DP Slave, 12Mbps

CQM1-SRM21-V1: CompoBus/S main station, up to 128 points

CQM1-ARM21: AS Interface master station, up to 31 slave stations

Instructions and Functions

Instructions: 162, 14 basic+148 specialized

Floating point operations, trigonometric functions, exponential logarithms, protocol macros (PMCR)

Interrupt: 4-channel input interrupt, 3-channel interval timer, high-speed counting interrupt

Data retention: HR, DM, TC power-off retention

Environment and Certification

Working temperature: 0~55 ℃, storage: -20~75 ℃

Humidity: 10%~90% RH (no condensation)

Certification: UL, CSA, CE, NK, LR

Installation: DIN rail

Key issues

Question 1: What are the core differences among the four CPUs of CQM1H? How should the project be selected?

answer

CPU 11/21: Economy type, 256 point I/O, does not support internal board and Controller Link, suitable for small single machines.

CP51: Standard type, 512 point I/O, supports internal board and network, suitable for most devices.

CPU61: High end model, 512 point I/O, 15.2K program+6K EM, suitable for complex logic and multi axis motion.

Simple rule: Choose 21 for small systems, 51 for regular systems, and 61 for complex systems.

Question 2: What is the use of CQM1H’s Protocol Macro? What devices can be connected to?

answer

Function: Directly execute custom serial port protocols through PMCR instructions, without the need for complex programming.

Dockable: devices with RS232/485 such as temperature controllers, barcode readers, instruments, frequency converters, weighing instruments, etc.

Advantage: Significantly simplifies development, completing sending and receiving parsing with one instruction.

Question 3: What is the maximum high-speed count of CQM1H? Which module is applied to? What modes are supported?

answer

Maximum frequency: 500kHz, using CQM1H-CTB41 high-speed counting inner board.

Support modes: phase difference, addition/subtraction, pulse+direction, supporting 1 ×/2 ×/4 × multiplication.

Application: Encoder speed measurement, positioning, length counting, supports interruption of target value and interval comparison.