Siemens SIMATIC IM 151/CPU Manual page 123

4 Add to the OB1 of the S7-300 CPU as shown below:
+RZ LW ZRUNV The status of the switch connected to I1.1 of the S7-300 is queried
and temporarily stored in memory marker M13.0. The entire MB13 memory byte is
transferred to the PQB12 I/O output byte. You specified in the hardware
configuration in step 8 – Configuring the S7-300 (stage 9) – that the area from
PQW12 to PQW44 in the S7-300 CPU is to be assigned to the area from PIW128
to PIW160 in the IM 151/CPU.
In the IM program, PIB128 is transferred to the MB12 memory byte. The memory
marker M12.0 addresses output Q2.1.
This results in the following communication paths:
I1.1
Q5.0
Getting Started - ET 200S-IM 151/CPU Interface Module
A5E00058783-01
6
M13.0
MB13 PQB12
PQW12
PIW12
MB12 PIB12
M12.1
,0 &38
PIW128
PIB128 MB12
M12.0
M13.1
PQB128 MB13
PQW128
*HWWLQJ 6WDUWHG
Q2.1
I1.0
8-15