13
7.1.1 Error with faulty population
If a double channel device is connected as channel 16/17, the control unit will receive the information that a
device is available at channel 16.
When reading out the Cominfo of the circuit protector, received the message that the circuit protector has wrong
parameters.
The channels cannot be operated (cannot be switched on).
7.1.2 Error device addressing
Due to mechanical problems, there may be addressing errors.
The LED on EM12D is permanently lighted orange.
Possible causes are deformed or missing contacts in the connector arm.
For putting the device into service again, the faulty circuit protector has to be removed and the supply voltage
has to be switched off and on again.
7.2 Physical interface
The physical interface used is RS485. Protocol used is the Modbus RTU protocol. It is unsusceptible to EMC
disturbances and allows artless implementation of the bus communication.
7.3 Setting the communication parameters
The parameters for the communication to the Modbus server are realised by means of the switches on the
device side.
x10 x1
busaddress
1
0
baudrate
parity
fig. 12: Potentiometers for the communication parameters
The address of the device is fixed in the bus structure by means of the potentiometers. The left rotary switch
fixes the power of ten, the right one fixes the power of one.
x10 x1
busaddress
fig. 13: Potentiometers for the communication parameters
Bus address of the device in this example is 41.
Summary of Contents for EM12D-TMB Series
Page 1: ...Instruction manual Controller EM12D TMB ...
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