7.9 Redundant bus connection AUMA Modbus devices can be connected with a second (redundant)
Modbus cable. If the bus on channel 1 fails, e. g. through cable break, the
slave automatically switches to channel 2 after a waiting time.
Thus, the change-over is realised with a time delay (see parameter 5
“Time for channel changing in 0.1s”, page 35).
Additionally, the communication cannot be carried out on both channels
simultaneously.
If the redundancy is activated (see parameter 4 “Redundancy”, page 34),
the AUMA MATIC transmits its data using both channels but receives the
data only using the active channel.
This cable redundancy may only be applied after previous
integration test using the desired process control system!
.
For versions with AUMA plug/ socket connector (subclause 7.2):
Connect redundant bus cable to channel 2 in the same way as channel 1
(figure C-2).
.
For Ex-version with plug/ socket connector / terminal board (KP)
(subclause 7.7):
Connect cable B to terminal 6, cable A to terminal 7.
The termination resistor for channel 2 is connected through linking the
terminals 5 – 6 and 7 – 8.
.
For Ex-version with plug-in terminal connection (KES)
(subclause 7.8):
Connect cable B to terminal 6, cable A to terminal 7 (figure E-2).
The termination resistor for channel 2 is connected through linking the
terminals 5 – 6 and 7 – 8.
The setting of the redundant bus connection is realised via the parameters
4 and 5 (refert to pages 34, 35).
18
Actuator controls AUMA MATIC AM/ AMExB/ AMExC
Modbus Operation instructions
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