Table 13- 7 Example Of Redundant I/O, Ob 122 Part - Siemens SIMATIC S7-400H System Manual

Table 13- 7 Example of redundant I/O, OB 122 part
STL
L OB122_MEM_ADDR;
L W#16#8;
== I;
JCN M01;
SET;
= IOAE_BIT;
JU CONT;
M01: NOP 0;
L OB122_MEM_ADDR;
L W#16#C;
== I;
JCN CONT;
SET;
= IOAE_BIT;
CONT: NOP 0;
S7-400H
System Manual, 03/2012, A5E00267695-11
13.5 Other options for connecting redundant I/Os
Description
// Does module A cause IOAE?
//Relevant logical base address
//Module A?
//If not, continue with M01
//IOAE during access to module A
//Set IOAE bit
// Does module B cause an IOAE?
//Relevant logical start address
//Module B?
//If not, continue with CONT
//IOAE during access to module B
//Set IOAE bit
Using I/Os in S7–400H
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