Siemens SIMATIC S5 Manual page 42

Technical Description of the IP 266
Example 2
The machining program described in example 1 is started, but the "External Start
Enable" signal is removed only at certain points. The timing diagram below
shows the chronological sequence effected by the "External Start Enable" and
"External Stop" signals.
Start
"TP exec."
signal
External
Start
External
Stop
"Position
reached"
signal
Flying
change
Function
M99
Traversing
program
The next job is delayed via the External Start Enable signal
2-20
IP 266
t
t
t
t
t
EWA 4NEB 812 6057-02