Siemens SIMATIC S7-400H Manual page 86

Using I/O on the S7-400H
Table 6-2 OB 122
STL
M01:
CONT:
6-14
Explanation
// Does module A cause PZF?
L OB122_MEM_ADDR; //Logical base address affected
L W#16#8;
== I; Module A?
JCN M01; //If No, continue with M01
//PZF upon access to module A
SET;
= PZF_BIT; //Set PZF bit
JU CONT;
// Does module B cause PZF?
NOP 0;
L OB122_MEM_ADDR; //Logical baseaddress affected
L W#16#C;
== I; module B?
JCN CONT; //If No, continue with CONT
//PZF upon access to module B
SET;
= PZF_BIT; //Set PZF bit
NOP 0;
S7-400H Programmable Controller Fault-Tolerant Systems
A5E00068197-04