Modbus Tables; Modbus Registers; Discrete Inputs; Coils - Mitsubishi Electric Procon A1M Installation Manual

7. Modbus tables

7.1. Modbus registers

Modbus Slave devices store data in registers. There are four register types and each type has its own register bank.
The register types are summarised below:
Register Name Register Type
Discrete Input Digital Input
Coil Digital Output
Input Register Analogue Input
Holding Register Analogue Output

7.2. Discrete Inputs

This device has no Discrete Inputs.

7.3. Coils

Coils are read using function code 01 and written to using either function code 05 or 15. Function code 05 is used when
writing to a single coil register, function code 15 is used for writing to multiple coil registers in the same command.
Register Name
Drive On/Off

7.4. Input registers

Input Registers are read using function code 04.
Register Name
Room Temperature in °C
Fault Code
Read only register used for holding status information which holds
a value of 0 or 1.
Read and write accessible register which holds a value of 0 or 1.
Read only register used for status information which holds a 16-bit
value (0-65535)
Read and write accessible register used for status information
which holds a 16-bit value (0-65535)
Coils (Digital Outputs)
Location
Length
(decimal)
0x00 = Drive off
0 1
0x01 = Drive on
Input Registers (Analogue Inputs)
Location
Length
(decimal)
Holds a temperature value in °C multiplied
0 1 by 10.
E.g. a value of 200 = 20°C
0x8000 = No error
1 1 0x6999 = Bad communication with indoor
unit
Description
Details
Details
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