40 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 Table 10
and Table 11to 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
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