Introduction to Mitsubishi PLC Modbus communication and address allocation

Create Date: 2024-8-30 12:03:23|Source: Mitsubishi Electric/Mitsubishi Electric

When using Modbus communication in Mitsubishi PLCs, it is necessary to understand the address allocation of different register types.

The following are the common types of Mitsubishi PLC Modbus addresses and their corresponding functions:

                               Introduction to Mitsubishi PLC Modbus communication and address allocation

1. Coil Register:

Address size: 0xxxx

Function: It is used to read and write logic switches, which can indicate the on/off status.

For example, 0xxxx corresponds to a Y address.

2. Discrete Input Registers:

Address size: 1xxxx

Function: Read-only logic switch for reading external input signals.

For example, 1xxxx corresponds to an X address.

3. Input Register:

Address size: 3xxxx

Function: Read-only 16-bit unsigned integer for reading analog quantity or condition information.

For example, 3xxxx corresponds to a D address.

4. Holding Register:

Address size: 4xxxx

Function: A 16-bit unsigned integer that reads and writes to store and correct data.

For example, 4xxxx corresponds to a D address.

It should be noted that the specific address size and function may vary according to different Mitsubishi PLC models and communication modules. Therefore, when using Modbus communication, it is recommended to refer to the manual of Mitsubishi PLC, or consult the relevant staff to obtain the corresponding information, in order to obtain accurate Modbus address allocation and operation guides.

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