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AddFEM
Mode of Operation
3-19
AddFEM
C79000–G8076–C900–03
Signals for Controlling The Redundancy Logic
Signals for controlling the redundancy logic are exchanged via the PROFIBUS DP
user data messages. A driver block with implemented redundancy logic is available
for SIMATIC S7.
Note:
The redundancy logic has to be configured for operation with other Hosts.
Host
Driver with redundancy logic
AddFEM
Redundancy logic
MRS
FG
KFG
ZRV MRV
LZ
ZRV MRV
LZ
LDA
MRS
FG
KFG
LDA
PROFIBUS
Figure 3-10 Signals for controlling the redundancy logic
Signals from the AddFEM to the Host
Signal name
Meaning
Value
FG
Error weighting
For structure refer to Chapter 4
KFG
Channel error
weighting
Number of faulty I/O channels
LDA
Sign of life + active
PROFIBUS DP
channel
Bit 0 – 3:
Return SoL to Host
Bit 4 – 6: Reserve
Bit 7:
0 = DP channel A is active
1 = DP channel B is active
MRS
Master/Reserve
status
0 = Reserve; 1 = Master
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