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Rockwell Automation Publication 5069-UM003B-EN-P - January 2020
Chapter 3
Compact 5000 I/O Serial Module Features
Modbus Slave Functions
Table 12 - Modbus Slave Configuration Parameters
Parameter
Definition
Available Options
Modbus Format
Selecting communication method of Modbus of each channel.
• 0 = RTU (default)
• 1 = ASCII
– Intervals of up to one second may elapse between characters within the
message. Unless the user has configured a longer timeout, an interval greater
than 1 second means that an error has occurred.
Node Address
Numbers to identify all modules that are connected to each
channel. You must set a number not equal to 0.
• 1…247 (default = 1)
Inter-frame Timeout
Maximum delay time to receive Data of each channel
• 0 is not a valid value. Use
and
to determine the minimum value.
Table 13 - Modbus Slave Supported Commands
Function Code as a Slave(in hex)
Function Name
0x01
Read Coil
0x02
Read Discrete Inputs
0x03
Read Holding Registers
0x04
Read Input Register
0x05
Write Single Coil
0x06
Write Single Register
0x16
Mask Write Register
0x17
Read/Write Multiple Registers
0x0F
Write Multiple Coil
0x10
Write Multiple Registers