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The SYSMAC CQM1 is a compact package that includes a high-speed Programmable Controller (PC) for advanced control operations in systems with 16 to 256 I/O points for every Personal computer. Omron Electronics designed and manufactured it. It is a programmable logic controller (PLC) package for industrial use. CQM1 CPUs, CQM1 bus units, CQM1-I, and CQM1-O input/output units are all part of the SYSMAC CQM1 Series. It also works with power supplies, dedicated I/O(s), and other components. Aside from that, network communications such as SYSMAC LINK, SYSMAC NET, and Ethernet networks are included. It is worth noting that the SYSMAC CPU units have an RS-232C port feature, Which helps users connect directly to a host computer, another CQM1, or other serial devices. The CMQ1 PLCs are mountable on a DIN rail. Furthermore, when it comes to compatible programming consoles, the SYSMAC CQM1 package is compatible with two consoles. Besides that, the CQM1 has many advanced features that can improve usability goals, save time, and reduce cost. For example, its CPU units have 16 input terminals built in. And users can easily add I/O units to increase I/O capacity. In addition, the SYSMAC CMQ1 SYS QM1 is roughly 20 times faster than P-type PCs. Also, it includes built-in high-speed timers and counters. Hence, outputs are processed (direct outputs) when instructions are executed. In summary, the SYSMAC CMQ1 is an improved package that supports PLCs and other programmable controllers used in factory automation.

Collage of images depicting SYSMAC CQM1 units


CQM1 is a programmable controller series with a built-in CPU, power supply, inputs, and outputs for various logic configurations. The products from this series have various features, which include an RS-232C port for communication with a computer.

This guide discusses all the features of the CQM1 series, which will help users to retrieve all the information and display the required information. From this information, users can easily observe the parameters of the controller and the output of sensors and actuators based on the given input.

Salient Features Associated with CQM1 Controllers

This section discusses all the features of CQM1 controllers to inform new users about these controllers and help them pick the model that best suits their requirements.

Some of its features are listed below.

  • The CPU has 16 input terminals. The terminals are built-in, so there is no need to attach an external system to access the terminals, which is the case in 8051 and other PICs.
  • External shields can be used to increase the number of input and output terminals.
  • The processing speed of the CQM1 controller is 20 times faster than a conventional P-type PC.
  • The built-in timers and counters have higher resolutions compared to other controllers.
  • It has direct outputs. In other words, the outputs are processed when the commands are executed. 

Each model of the CQM1 series has its pros and cons. In the following sections, a detailed discussion on each feature has been carried out.

Interrupt Support

An interrupt service routine (ISR) is a property of a controller with the help of which the user can terminate the program during the execution phase. When an interrupt executes, it runs the function of interrupt and stops the already running code. Interrupts are the most important criteria to consider when it comes to the selection of a controller for a project. CQM1 controllers have multiple interrupt protocols, as discussed below.

  • Input Interrupts: These interrupts can be used when the controller must process the signal coming in from an external device, and its time must be shorter than the program execution time.
  • Interval interrupts: These interrupts are also known as scheduled interrupts. Interval interrupts are suitable in situations where high speed is required.  
  • Counter interrupts: These interrupts are called high-speed counter interrupts. They work primarily on the frequency of the system. They are mostly used as encoders for motors where each small pulse must be considered.

All models of the CQM1 series are equipped with interrupt service routines. There are two models of the CQM1 series that can work up to 50kHz frequency, one is the CQM1-CPU-43-EV1, and the other one is CQM1-CPU44-EV1. These two models can be applied where speed is essential.

Communication Protocols

This section will give the user a better understanding of how communication protocols work in the CQM1 series. They are important for the selection of the controller. Based on the prior knowledge of communication protocol, one can select a controller depending on the task at hand. All the models of the CQM1 series have an RS-232 communication port through which they can communicate with other external devices. There are different methods involved with RS-232 communication, which are briefly discussed below.

  • All the CQM1 models can communicate with the host computer using host link commands. The user can provide inputs and outputs in the form of code to the controller and relevant actions can be performed by the controller accordingly.
  • The RS-232C port can read the data from any sensor and transfer it to the controller. This way, the output can be supplied to the actuator or the external device.
  • One-to-one link is another method used in the CQM1 series. In this method, the system can communicate with multiple PCs that are connected over the same link, and all commands can be executed in a synchronized manner.

The communication protocols give an upper hand to the CQM1 series over other controllers because they make the CQM1 models more versatile for implementation.

Only the CQM1-CPU11-E model has an RS-232C built-in interface, while all the other models have an RS-232C port in them.

Memory Cassettes

In some instances, the user may require more storage capacity than the available internal memory of the CQM1 model. For this purpose, the manufacturer has provided different models/extensions which can help increase the memory. These memory cassettes have different specifications depending on the model being used. The following list shows the specifications of different memory cassettes, which can help users decide which memory cassette is best suited for their project.

  • CQM1-MP08R
    • Clock Function: Available
    • Memory: EPROM
    • Programming Requirements: A PROM writer is required for programming
  • CQM1-MP08K
    • Clock Function: Not Available
    • Memory: EPROM
    • Programming Requirements: A PROM writer is required for programming
  • CQM1-ME08R
    • Clock Function: Available
    • Memory: EEPROM
    • Programming Requirements: A programming console is required for Programming (8k words)
  • CQM1-ME08K
    • Clock Function: Not Available
    • Memory: EEPROM
    • Programming Requirements: A programming console is required for Programming (8k words)
  • CQM1-MP04R
    • Clock Function: Available
    • Memory: EEPROM
    • Programming Requirements: A programming console is required for Programming (4k words)
  • CQM1-MP04K
    • Clock Function: Not Available
    • Memory: EEPROM
    • Programming Requirements: A programming console is required for Programming (4k words)

Analog Setting Functions

Product number CQM1-CPU42-EV1 in the CQM1 series can adjust the functions with the help of four control knobs. A mini screwdriver can be used to set the values. Clockwise rotation refers to an increase in the value, and counterclockwise rotation of the knob refers to a decrease in the value. This controller is useful when the user must change the input within a given range. The change in values is according to the binary coded decimal (BCD).

ABS Interface Function

Suppose a user is working on a project where encoders are involved, and the user needs to find the absolute number of pulses generated by the encoder. This function is supported by the CQM1-CPU44-EV1 model of the CQM1 series. The model has an ABS interface which allows the user to control the encoders. This model has two designated pins: “CN1” and “CN2” for receiving absolute values from the encoder in the form of gray code. The controller then passes the data to the user. This data can be used by the user to apply algorithms to them and take useful work from them. Therefore, if the task involves the use of encoders and the manipulation of the data from the encoders, then this model is the best option in the CQM1 series.

Power Supply Units

The main issue with the controllers is always the power supply distribution and their corresponding current consumption. In the CQM1 series, there are four different types of power supplies. Three of them are alternating current (AC) power supplies, and one of them is a direct current (DC) power supply. The user can select the power supply depending on the application and the power consumption of the whole system. The name and the specification of each power supply available in the CQM1 series are given in the list below.

  • CQM1-PD026
    • DC
    • Specifications: 5 Volts, 6 Amperes, 30 Watts
  • CQM1-PA216
    • AC
    • Specifications: 5 Volts, 6 Amperes, 24 Volts DC, 0.5 Amperes, 30 Watts
  • CQM1-PA206
    • AC
    • Specifications: 5 Volts, 6 Amperes, 24 Volts DC, 0.5 Amperes, 30 Watts
  • CQM1-PA203
    • AC
    • Specifications: 5 Volts, 3.6 Amperes, 18 Watts

I/O Points and Units in the CQM1 Models

I/O units can be connected to a controller, whereas points can be controlled using a specific controller. I/O units and points are important, and the decision to use a certain number of points and units is entirely dependent on the application. If the user has multiple sensors and actuators embedded in a system, then the user must select a controller with many I/O points.

Moreover, if the user has a task that requires a small number of actuators, end effectors, and sensors, then the user must select a controller with fewer I/O points. In this way, the energy consumption and complexity of the system can be reduced, and it can perform in optimal conditions.

The CQM1-CPUXX-EV1 model has a maximum of 256 I/O points and 11 I/O units, the CQM1-CPUXX-E has a maximum of 192 I/O points and 11 I/O units, and the CQM1-CPU11/21-E has a maximum of 128 points and 7 units of I/O. With the help of the specifications provided in this section, users can choose the relevant model based on the requirement of I/O units and points.

Other Features

Apart from all the above features discussed earlier, there are some other features as well, with the help of which the user can select a model from different models of CMQ1 as well.

These features are as follows.

  • The CQM1-CPU43-EV1 model of the CQM1 series can generate a high output pulse. This model can generate a pulse of up to 50 kHz from two designated outputs, whereas all the other models of CQM1 can generate up to 1 kHz pulse at the output.
  • When talking about analog setting function, the CQM1-CPU42-EV1 model has 4 channels with the help of which analog settings can be adjusted.
  • Different programming consoles are available for these CQM1 controllers, with the help of which the user can set interrupts, inputs, and other functions. The buttons on these consoles act as inputs or interrupts. The most common type of programming consoles is the CQM1-PRO01-E and the CQM1-PRO27-E.

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