Modbus Master Mode; Supported Modbus Functions; Io Memory Size - ICP DAS USA I-7530A-MR-FD User Manual

6. Modbus Master Mode

To compare with the chapter 5, this section will introduce the Modbus
master mode of the I-7530A-MR-FD. Via this function, the I-7530A-MR-FD can
act as a Modbus master to CAN module. Following, this sector will illustrate
how to configure and how to operate the function in detail.

6.1 Supported Modbus Functions

The Modbus Master function supports Modbus function code: 0x01, 0x02,
0x03, 0x04, 0x05, 0x06, 0x0F, and 0x10. The following table will describe in
detail.
Modbus
command
1 (01 Hex)
2 (02 Hex)
Modbus
Read
command 3 (03 Hex)
4 (04 Hex)
5 (05 Hex)
6 (06 Hex)
Modbus
Write
command 15 (0F Hex)
16 (10 Hex)

6.2 IO Memory Size

I-7530A-MR-FD Modbus RTU to CAN Converter User's Manual (Version 1.0, 08/2022) ------------- 95
Table 6-1: Supported Modbus Function Codes
Function Function Name
Code
Read Coil Status
Read Input Status
Read AO Holding
Read AI Registers
Write Single Coil
Write Multiple Coil
Write Multiple
Registers
Write Signal
Register
Registers
Description
Read Coil Status from slave
device.
Read Input Status from slave
device.
Read AO Holding Registers
from slave device.
Read AI Registers from slave
device.
Write Single Coil from slave
device.
Write Single Register from
slave device.
Write Multiple Coil from slave
device.
Write Multiple Registers from
slave device.