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The code of the last fault detected is given in this word. The
following error codes cause the PLC to
stop if %S78 is set to 1. %S15, %S18 and %S20 are activated
independently of %S78:
16#0002: PCMCIA signature not verified
16#2258: execution of HALT instruction
16#2302: call to a not supported system function in a user function
block
16#9690: error of application CRC detected in background
16#DE87: calculation error on floating-point numbers (%S18, these
errors are listed in the
word %SW17)
16#DEB0: watchdog overflow (%S11)
16#DEF1: character string transfer error (%S15)
16#DEF2: arithmetic or division by 0 error (%S18)
16#DEF3: index overflow (%S20)
Note: The codes 16#8xxx and 16#7xxx do not mstop the application
and indicate an error on
function blocks. In case of a SIL3 related error, the PLC stops.
After power off and restart of the PLC, %SW 125 contains the code
of the cause of the error:
0x5AF1: sequence check error (unpredictableexecution in CPU)
0x5AF2: error in memory (corrupt address)
0x5AF3: comparison error (execution results of Intel and
application processor differ)
0x5AF4: real-time clock error
0x5AF5: error initializing double codeexecution
0x5AF6: watchdog activation error
0x5AF7: error during memory check (takes more than 8 hours)
0x5AF8: error in memory check (corrupt RAM)
Note: %SW125 is only reset after init orcomplete download or
restart (it always contains the last fault detected).
