Table of Contents
Advertisement
OB 38/OB 39 call
Initial status: RUN
POWER DOWN/POWER UP
Communication
Communication
processed once
AUTOMATIC
WARM RESTART
Fig. 4-3
Program execution after POWER UP
Fig. 4-4
Program execution after a cycle interruption
CPU 948 Programming Guide
C79000-G8576-C848-04
Figures 4-3 and 4-4 illustrate the principle of the OB 38 and OB 39
calls.
OB 38
start-up
OB 39
OB 22
RUN
OB 1
OB 39
Cyclic processing
of communication
Initial status: SOFT STOP
POWER DOWN/POWER UP
OB 38
Communication
start-up
OB 39
Cyclic processing
of communication
Interruption e.g.
by STS operation
STOP Mode
4 - 11
Advertisement
Table of Contents
