Siemens SIMATIC S5 Manual page 309

IP 266
FB 4: Follow-up mode
The only entry made in this FB is the mode number. In the sample program, this
mode cannot be selected via switches. It is invoked only to respond to error
messages.
START
Enter mode
number in QB 64
END
FB 5: Approach/Set reference point
When this operating mode has been selected, a "0" in QB 66 sets the
"APPROACH" submode.
START
Enter mode
number and
select
"APPROACH"
END
EWA 4NEB 812 6057-02
FB 4 - NAME:MO4
Mode 4 (follow-up mode) is invoked in the
sample program only to respond to a position
control loop error or an error in the position
control direction.
L
T
BE
FB 5 - NAME:MO5
The reference point approach is invoked via
the "Set" parameter:
L
T
L
T
BE
STEP 5 Programming
KB 4
QB 64
KB 5 MODE 5
QB 64
KB 0 0 = Set
QB 66
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