Siemens SIMATIC S5 Equipment Manual page 188

9.6.3.1 Interrupt Processing
Starting with firmware status R08, the interrupt behavior of the module can be modified by writing
the block address +4 as follows:
– Interrupt identifier bits deleted after reading byte 7
KH = El
– Interrupt identifier bits not deleted after reading byte 7
KH = E2
– Bit 4 is set by byte 7 during the read access
Interrupt line IR is always reset however.
Point in time of the write access for:
KH = El – Interrupt program (otherwise no further interrupt possible)
KH = E2 – Startup OB
For use be standard function blocks after calling FB 156
(Call performs reset of the module.)
Example for module address 144:
o
156
BE
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Programming Instructions
JU FB 157
LKBO
TPY 148
BE
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