Siemens SIMATIC S5 Manual page 64

Control of the IP 265 by the CPU User Program
Load IP 265 from
memory submodule
IPs = Input parameters
QPs= Output parameters
Figure 6-1. Control System Flowchart: Control of IP 265 by the CPU User Program
6-2
POWER ON
CPU transfers RUN instruction
(OB21/OB22)
IP 265 loaded
No
Yes
IP 265 switched to
RUN state
IP 265 provides status
and AP
CPU evaluates status word
IP 265 in RUN state
Yes
IPs/QPs
No
Evaluation
Yes
CPU evaluates QPs and
sends IPs where appropriate
No
CPU evaluates error
messages and responds
accordingly
EWA 4NEB 812 6130-02a
IP 265
Load IP 265
Start IP 265
Exchange of input
and output data
between IP 265
and CPU