Fault Elimination; Failure And Exchange Of Redundant Addfems During Operation - Siemens Add 7 AddFEM Manual

AddFEM
5.7

Fault Elimination

5.7.1 Failure and Exchange of Redundant AddFEMs during
Operation
Exchanging modules during operation is decisive for non–interrupted operation of the
AddFEMs at module redundancies.
Initial Situation
•
One AddFEM fails
Prerequisites for Replacing
The exchange described below is only possible if the "new" AddFEM
•
has the same version as the one which has failed and
•
any existing preprocessing functions (FEF) have the same firmware version.
Procedure
Step
1
2
3
4
5
6
AddFEM
C79000–G8076–C900–03
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Failure
The partner module takes over the master function
What is to be done?
Turn the key–operated switch at the cor-
responding module from RUN to STOP
Remove the optical–fiber cable for the
1)
redundancy connection
Disconnect the power supply
Loosen the process signal cables and
remove the module
•
Install the new module
•
Connect the process signal cables
•
Turn the key–operated switch to the
2)
STOP position
•
Plug the optical–fiber cable for the
redundancy connection
•
Apply the supply voltage
Turn the key–operated switch from
STOP to RUN
Commissioning / Operation / Maintenance
How do the AddFEMs react?
How do the AddFEMs react?
The partner module takes over the
master function and changes to the
state LINK–UP (LED RES flashes)
The two AddFEMs signal an error at
the redundancy coupling (LED RED
is on).
The AddFEM carries out automatic a
LINK–UP. The new installed module
takes over the reserve function.
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