Excerpt From Modbus List - Samson 3374-10 Mounting And Operating Instructions

17.2.8 Excerpt from Modbus list

The electric actuator in firmware version 3.10 and higher can be fitted with an RS-485 mod-
ule to use the Modbus-RTU protocol. This protocol is a master/slave protocol. In this case, a
control station is the master and the electric actuator the slave, for example.
The following Modbus functions are supported:
Code Modbus function
1 Read Coils
3 Read Holding Registers
5 Write Single Coil
6 Write Single Register
15 Write Multiple Coils
16 Write Multiple Registers
The electric actuator can issue the following Modbus error responses:
Error code Error
1 Illegal function
2 Illegal data address
3 Illegal data value
4 Slave device failure
6 Slave device busy
Several important data points from the Modbus data point list are listed below. The entire da-
ta point list is available on request.
EB 8331-4 EN
Decommissioning and disassembly
Application
Read state of several digital outputs in bit format
Read several parameters
Write a single digital output in bit format
Write a value into a single holding register
Write several digital outputs in bit format
Write a value into several holding registers
Cause
The function code is not supported.
A register address is invalid or write-protected.
A value contained in the data is not allowed or not
plausible.
An unrecoverable error occurred during an action.
The slave is busy and cannot accept the query.
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