Interfaces, Networks and Data Communication for the S7-400
5-14
Automation System S7-400 Configuration and Use
A5E0044271 1-02
SFB Description
SFB 19 START This triggers a restart or complete restart for a CPU when it is in the STOP
state.
SFB 20 STOP Brings a CPU to STOP when it is in the RUN, HALT or starting state.
SFB 21 RESUME This triggers a warm restart for an S7-400 CPU when it is in the STOP state.
Monitoring functions
Using these SFBs, you can obtain information about the operating status of a
communication partner.
SFB Description
SFB 22 STATUS Provides the operating s tatus of a communication partner in response to a
request.
SFB 23 USTATUS Receives the operating status of an S7-400-CPU when the operating s tatus
changes
Query functions
With this function you can obtain information about the internal status of the local
communication SFBs and the corresponding connection in the program.
SFC Description
SFC 62 CONTROL Queries the status of a connection
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