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Troubleshooting

9-6

SIMATIC 545/555/575 System Manual

9.2 Troubleshooting by Reading LEDs

The LEDs on the 545/555 CPUs are labeled CPU GOOD, RUN, and BATT

GOOD. These LEDs provide CPU status as shown in Table 9-2.

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 base power supply module is defective or turned off, all CPU

indicators will be off.

Table 9-2 CPU Indicators

Indicator Status Meaning

CPU GOOD On CPU functioning with no fatal errors.

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

RUN

Flashing

Analog (Loops, Analog Alarms, and SF programs) is

in the RUN mode and discrete (RLL program) is in

the PROG mode.

On Battery is good and switch 9 is set to the On position.

BATT GOOD

Flashing

Battery is marginal and switch 9 is set to the On

position.

Off

Battery is discharged or Switch 9 is set to the Off

position.

Data in the CPU is backed up by a lithium battery. Status of the battery

LED is determined as follows:

• When the battery dipswitch is set to the On position, a battery test is

initiated within one second. The battery status LED is updated with

the test result.

• While the battery dipswitch is in the On position, the battery is

retested whenever the hour byte of the time-of-day clock changes value.

The battery status is reflected by the results of the last completed test.

• When the battery dipswitch is set to the Off position, battery-low status

is indicated within approximately one second.

545/555 LEDs

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