STARTUP / TROUBLESHOOTING
5-4
Hardware and Installation User Manual
5.2
USING THE TROUBLESHOOTING TOOLS
This section offers information and guidelines for troubleshooting TI525/TI535
PLCs. If you cannot locate the source of the problem, contact your Siemens
Industrial Automation distributor or sales office. If you need assistance in
contacting your U.S. sales office, call 1–800–964–4114.
5.2.1
Reading the LED Indicators
The three LEDs on the PLC are labeled RUN, BATTERY GOOD, and PLC
GOOD. When the LEDs are on, they indicate status as shown in Table 5-1 and
can aid in locating the source of a problem. The PLC LEDs are meaningful only
when the DC POWER GOOD LED on the power supply is turned on.
Table 5-1
LED Indicators
RUN
BATTERY GOOD
PLC GOOD
ON = Battery is good and
battery dipswitch
is on
ON = PLC is functioning
with no fatal errors
ON = PLC is in Run mode
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