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Troubleshooting

9-4

SIMATIC 545/555/575 System Manual

Troubleshooting by Using Auxiliary Functions (continued)

AUX 17 (Compare PLC to Disk) compares the selected program on disk to

data in the CPU.

AUX 20 (PLC Diagnostics), available only for 545/555 CPUs, initiates the

CPU self-checks. The CPU must be in PROGRAM mode in order to execute

self-tests. For 545/555s, the CPU executes the equivalent of an AUX 20 at

every powerup. If any area fails, a message detailing the failure is

displayed. AUX 20 makes the following tests.

• Valid RAM locations are verified.

• Pre-coded ROM checksum values are checked.

• The hardware force function is checked.

• Internal timer operation is verified.

AUX 25 (Display Failed I/O) displays the locations of any failed I/O modules

that are capable of diagnosing and indicating failure. Some modules, such

as word and analog modules, report that they have failed if the

user-supplied voltage is not correct.

AUX 25 also displays I/O mismatch(es), indicating that one or more

installed module(s) do not agree with the I/O configuration. Verify that the

configuration data for listed modules is correct before considering that the

module may actually be malfunctioning.

AUX 29 (PLC Operational Status) checks the operational status of the CPU

and displays the results. The display provides the information illustrated in

Figure 9-1. Field descriptions are listed below.

• Application ID (575 only) Identifies the CPU currently selected.

• Communications Identifies port or network in use.

If you are using a communications port, the port is identified, followed

by a space and the protocol: e.g., P1 TBP, or P2 NITP. The current baud

rate is displayed in a field to the right.

If you are using a network, the network is identified: e.g., TIWAY

NETWORK, or H1 NETWORK. In the case of H1, the network

connection name is displayed, in quotation marks, in a field to the

right.

• Scan Scan time reported by AUX 29; it is the highest scan time

recorded since the last CPU reset, PROGRAM–RUN mode transition,

or user peak resets. Status Word 10 (STW10) contains a continuously

updated report of the scan time.

Compare PLC

to Disk

Run 545/555 PLC

Diagnostics

Display Failed I/O

PLC Operational

Status

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