Siemens SIMATIC TI525 - AUX Function 25 (Display Failed I;O); AUX Function 20 (Run PLC Diagnostics); AUX Function 11 (Partial Restart); AUX Function 12 (Complete Restart)

STAR TUP / TROUBLESHOOTING
5-6
Hardware and Installation User Manual
5.2.2.2 AUX Function 25 (Display Failed I/O)
AUX Function 25 displays the locations of any failed I/O modules which are
capable of diagnosing and indicating failure. Some modules, such as word and
analog
modules, report that they have failed if the user -supplied voltage is not
correct.
AUX Function 25 also displays I/O mismatch(es), indicating that one or more
installed module(s) do not agree with the I/O configuration. Verify that the
configuration data for listed modules is correct before considering that the
module
may actually be malfunctioning.
5.2.2.3 AUX Function 20 (Run PLC Diagnostics)
AUX Function 20 initiates the PLC self-checks. The PLC must be in PROGRAM
mode in order to execute self-tests. The PLC executes the equivalent of an AUX
Function 20 at every power -up. If any area fails, a message detailing the failure
is displayed. AUX Function 20 makes the following tests:
 V alid RAM locations are verified.
 Pre-coded ROM checksum values are checked.
 The hardware force function is checked.
 Internal timer operation is verified.
 Operating system ROM cyclic redundancy check code is checked.
5.2.2.4 AUX Function 11 (Partial Restart)
AUX Function 1 1 clears the discrete and control relay image registers, but does
not affect forced elements, retentive control relays, preset values, and word
image registers. AUX Function 11 puts the PLC in PROGRAM mode only if a
fatal error is present or the previous mode was PROGRAM.
5.2.2.5 AUX Function 12 (Complete Restart)
AUX Function 12 clears the discrete, control relay, and word image registers
and the retentive control relays, but does not affect forced elements and word
registers. All preset values are downloaded at restart. AUX Function 12 puts
the
PLC in PROGRAM mode only if a fatal error is present or the previous mode
was PROGRAM.
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