Using The Troubleshooting Tools; Reading The Led Indicators; Led Indicators - Siemens SIMATIC TI525 Hardware And Installation 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.
RUN
BATTERY GOOD
PLC GOOD
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STARTUP / TROUBLESHOOTING
Table 5-1 LED Indicators
5-4
ON = PLC is in Run mode
ON = Battery is good and
battery dipswitch
is on
ON = PLC is functioning
with no fatal errors