Error Detection And Entry In The Error Db; Error Detection - Siemens SIMATIC S5 Manual

Error Diagnostics
5.4

Error Detection and Entry in the Error DB

The S5-115F has user-friendly methods of error detection and error handling.
5.4.1

Error Detection

The BS 115F exposes errors in all program sections caused by configuring, programming, handling
and hardware defects. In addition, it contains extensive test routines for hardware components.
These tests are carried out during a restart and during the PLC cycle, with the restart test running
independently. The test during the PLC cycle is divided into time slices lasting between 10 msec.
and, in extreme cases, 140 msec. The operating system organizes the test in such a way that the
whole test is completed after expiry of the configured test cycle time. This test cycle time must be
configured smaller than or equal to the second error entry time (specified by the licensing
authority). The longer the test cycle time, the shorter will be the average load put on the PLC cycle
by the self-test.
After they have been detected, the errors are stored in a data field (record) of eight bytes.
Byte No.
0
1
2
3 to 7
Meaning of addresses in the additional information
You will find the following locations specified in the additional information:
• Subunit
• I/O word number
• I/O byte number
• Bit number
The entries for subunit, I/O word number and I/O byte number indicate the actual error location.
This is also the case if two alternative locations are specified, such as in comparison error 16.01:
"DIs in A and B not identical, discrepancy time expired"
Either the specified I/O address in subunit A or the same address in subunit B can be the error
locations. In contrast, the bit number does not always indicate the actual I/O error location. For
example, in the case of comparison errors, only the number of the erroneous bit found first is
displayed and any further erroneous bits are not specified.
5-10
Table 5-5. Assignment of the Error Record
Error group, Type of error
Number of the program section which
detected the error
Current number within the program
section in byte 1
Additional information
S5-115F Manual
List in ...
5.5.2, Appendix B
Table 5-6., Appendix B
Appendix B
EWA 4NEB 811 6149-02