Siemens SIMATIC S7 F Manual page 105

Programming
Configuring Messages
The same module diagnostic blocks are used for the F-I/Os as for the standard
modules. The following MOD, SUBNET and RACK blocks are inserted
automatically when you choose the Options > Charts > Generate Module
Drivers menu command:
Per Fail-safe signal module
SM 326F DI 8xNAMUR
SM 326F DI 24xDC24V
SM 336F AI 6x13Bit
SM 326F DO 10xDC24V/2A
Per DP master system
Per rack
In contrast to the standard drivers, the F-driver blocks are not interconnected with
the PCS 7 blocks.
Note
Messages about the following are issued from the MOD, SUBNET and RACK
blocks: parameter assignment errors, module removed, module errors, channel
errors, rack failures and DP master system failures. I/O access errors cannot be
detected and reported by the diagnostic blocks.
Fail-Safe Systems
A5E00085588-03
Block
MOD_D1
MOD_D2
MOD_D1
MOD_D1
SUBNET
RACK
No.
FB 93
FB 93
FB 93
FB 93
FB 106
FB 107
5-23