Siemens SIMATIC S7-400 Configuration And Use Manual page 78

Interfaces, Networks and Data Communication for the S7-400
SFB
SFB 19 START
SFB 20 STOP
SFB 21 RESUME
Monitoring functions
Using these SFBs, you can obtain information about the operating status of a
communication partner.
SFB
SFB 22 STATUS
SFB 23 USTATUS
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
SFC 62 CONTROL
5-14
This triggers a restart or complete restart for a CPU when it is in the STOP
state.
Brings a CPU to STOP when it is in the RUN, HALT or starting state.
This triggers a warm restart for an S7-400 CPU when it is in the STOP state.
Provides the operating status of a communication partner in response to a
request.
Receives the operating status of an S7-400-CPU when the operating status
changes
Queries the status of a connection
Description
Description
Description
Automation System S7-400 Configuration and Use
A5E00442711-02