Siemens SIMATIC S5 Equipment Manual page 52

R 02/92
Operating Instructions
9) Setting up a cyclic program in OB1
– Cyclic program depending on programmable controller and task
10) Setting up the interrupt program
– Save scratchpad flags
– Evaluate interrupts with FB 157 (BEF = KB)
Scan and evaluate interrupt bit
In case of interrupt jump to your specific interrupt program
– Reload scratchpad flags
see sections to 2.3 to 2.8
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