Siemens S5-100U - 5.4 I;O Faults; 5.5 System Parameters

Diagnostics and Troubleshooting S5-100U
5.4 I/O Faults
Figure 5-8. Analyzing the Cause of a Fault in the I/Os
no
no
no
no
no
no
Module with fault
indication
(red LED)
Red LED lights.
Short circuit at
the outputs?
Defective fuse
Replace fuse.
Check
supply
leads.
Eliminate
short
circuit.
Defective
module
yes
yes
yes
yes
yes
no
Check supply
leads.
- Check module
(exchange).
- Check program.
yes
Replace bus unit.
Replaced module
is defective.
yes
no
yes
Power supply ok?
no
Module addressable via
the process input image
(PII) and
the process out-
put image (PIQ) (STA-
TUS VAR, FORCE VAR)
Bus connection ok?
Replace module with
simulator module.
Is a check with STATUS
VAR or FORCE VAR
possible?
Check connections of
other bus units and
interface modules.
yes
Fault
Module power
supply ok?
5.5 System Parameters
The “SYSPAR” programmer function makes it possible to read out the system parameters (e.g.,
CPU software version) of the programmable controller (see programmer manual).
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