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Troubleshooting

9-7

SIMATIC 545/555/575 System Manual

The LEDs on the 575 provide CPU status as listed in Table 9-3.

NOTE: Since the CPU receives power from the base power supply module,

the power supply must be on and functioning correctly to turn the LEDs on.

If the power supply module is defective or turned off, all CPU indicators will

be off.

Table 9-3 575 CPU Indicator

Indicator Status Meaning

PCG On CPU functioning with no fatal errors; fault relay is

closed.

PCG Off System has failed; fault relay is open.

RUN On CPU (analog and discrete) is in the RUN mode.

RUN Flashing Analog (Loops, Analog alarms, and SF programs) is in

RUN mode, and discrete (I/O and RLL program) is in

PROGRAM mode.

BAT On Battery disconnected or bad.

BAT Off Battery connected and good

BAT Flashing Remote I/O annex card configuration dipswitch settings

do not match the primary 575 CPU’s remote I/O CPU

annex card dipswitch settings. The 575 system is in fatal

error mode. The board with the flashing BAT LED is

disabled.

WDG On CPU in watchdog fatal error.

MOB On CPU is the active VME bus master.

SYF On This CPU failed, or is doing power-up diagnostics. After

a CPU fails, the SYF LED remains on until the next

power-cycle or until the problem is removed.

The LEDs on the 575 power supply module are listed in Table 9-4.

Table 9-4 Power Supply LEDs

Indicator Status Meaning

POWER GOOD On Power is good

FAULT On Power supply is not regulating correctly

575 LEDs

1 2 ... 222 223 224 225 226 227 228 229 230 231 232 ... 321 322

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