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2-7

SIMATIC 545/555/575 System Manual

Pre-installation Guidelines

Power-up Reset

Power-off

AUX 11 or

AUX 12

restart

Non-fault

575 CPU

initialization

Fault Detected

Fault

Detected

FAULT

mode

Power-off

(open)

FAULT

IDLE

(open)

(closed)

NORMAL

Figure 2-4 Software State Diagram

Fault State

The fault relay opens whenever the 575 CPU enters the FAULT mode or

loses power. To close the fault relay after entering FAULT mode, transition

the 575 CPU to PROGRAM mode either by executing an AUX 11 or AUX 12

from TISOFT, or by performing a bad-battery power cycle.

NOTE: If a hardware watchdog timeout sends the CPU into FAULT mode

(WDG LED is illuminated) when the 575 is configured as

USER-CONFIGURED

and DO NOT ASSERT/WAIT FOR SYSRESET* (in other words, SW5 on the I/O

annex card is set to the Off position), the following procedure must be

followed to re-enable the fault relay:

• Execute a power cycle. After the power cycle, the 575 system is still in

FAULT mode and the fault relay on each of the 575–2104 CPUs in the

system is open.

• Execute AUX 11 or AUX 12 from TISOFT. The 575 CPUs are now in

PROGRAM mode and the fault relay on each of the 575 CPUs in the

system is closed.

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