S5-115F Manual Error Diagnostics
The following operating system programs detect errors:
Table 5-6. Error-Detecting Programs of the Operating System
Byte 1* Function of the Program Section
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2 Updating of user locations T0 to T127 and of ”long discrepancy times”
(times for 256 digital inputs)
Synchronization of user servicing of process (OB2) and time (OB13) interrupts
14 Coordination of the modes in both subunits
4
Test manager; supports time slice tests of the various hardware components
16 Comparison of the digital input images (PII) of both subunits and analysis of non-
identical signals
Read and exchange analog inputs
Comparison of the output images (PIQ) of both subunits18
17
Synchronization of SINEC L1 interfaces23
Copying of the RAM from subunit A to subunit B, since subunit B does not permit PG
operator input
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RAM comparison of both subunits
Bit test of the parallel link
Test of the non-intermittent digital I/Os
STEP address counter (SAZ) test
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Logic gating of error DBs 2 and 3 for subunit A and B31
Test of the non-intermittent analog inputs33
Edge-triggered DI matrix test32
* Byte 1 in error record
EWA 4NEB 811 6149-02
5-11
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