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Troubleshooting

9-2

SIMATIC 545/555/575 System Manual

9.1 Troubleshooting by Using Auxiliary Functions

The troubleshooting information in this chapter is generic unless a specific

CPU is stipulated.

The CPUs have self-checking and diagnostic capabilities that can be used

for troubleshooting. The diagnostics and self-checks are accessible through

the Auxiliary Function menu on your TISOFT programming device.

When you display the Auxiliary Function menu, the following functions are

available for resetting the CPU, initiating diagnostics, or displaying

diagnostic information:

• Power-up Restart — AUX 10

• Partial Restart — AUX 11

• Complete Restart — AUX 12

• Compare PLC to Disk — AUX 17

• PLC Diagnostics — AUX 20 (545/555 CPUs only)

• Display Failed I/O — AUX 25

• PLC Operational Status — AUX 29

AUX 10 (Power-up Restart), AUX 11 (Partial Restart), and AUX 12

(Complete Restart) are restart/clear functions. See Table 9-1 for AUX 10,

AUX 11, and AUX 12 restart states.

If configured to do so, a 575 that is acting as system controller asserts

SYSRESET on the VMEbus on any fault restart (i.e., AUX 11 or AUX 12

from TISOFT in FAULT mode).

If the 575 is executing in FAULT mode with a bad battery, and an AUX 11

or AUX 12 is executed from TISOFT, the 575 performs a bad-battery

powerup (all user memory is re-initialized).

Overview

Power-up Restart,

Partial Restart, and

Complete Restart

575 Fault Restarts

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