EB 8331-4 EN 93
Decommissioning and disassembly
17.2.8 Excerpt from Modbus list
The electric actuator in rmware version 3.10 and higher can be tted 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 Application
1 Read Coils Read state of several digital outputs in bit format
3 Read Holding Registers Read several parameters
5 Write Single Coil Write a single digital output in bit format
6 Write Single Register Write a value into a single holding register
15 Write Multiple Coils Write several digital outputs in bit format
16 Write Multiple Registers Write a value into several holding registers
The electric actuator can issue the following Modbus error responses:
Error code Error Cause
1 Illegal function The function code is not supported.
2 Illegal data address A register address is invalid or write-protected.
3 Illegal data value A value contained in the data is not allowed or not
plausible.
4 Slave device failure An unrecoverable error occurred during an action.
6 Slave device busy The slave is busy and cannot accept the query.
Several important data points from the Modbus data point list are listed below. The entire da-
ta point list is available on request.
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