Siemens SIMATIC ET 200AL, System Manual

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Setting and determining system diagnostics
4.2 Options for displaying system diagnostics
Diagnostics
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4.2.2 Diagnostics information in STEP 7
4.2.2.1 Explanation of diagnostics symbols
Diagnostics symbols for modules and devices
When the online connection to a device is established in STEP 7, the diagnostics status of
the device and its lower-level components and, if applicable, the device operating mode are
also determined. The following table shows the possible symbols and their meaning.
Table 4- 2 Diagnostics symbols for modules and devices
Symbol Meaning
The connection with a CPU is being established.
The CPU is not reachable at the set address.
The configured CPU and the CPU actually present are of incompatible types.
Example: An existing CPU 315-2 DP is incompatible with a configured CPU 1516-
3 PN/DP.
On establishment of the online connection to a protected CPU, the password dia-
log was terminated without specification of the correct password.
No fault
Maintenance required
Maintenance demanded
Error
The module or device is deactivated.
The module or the device cannot be reached from the CPU (valid for modules and
devices below a CPU).
Diagnostics data is not available because the current online configuration data
differ from the offline configuration data.
The configured module or device and the module or device actually present are
incompatible (valid for modules or devices under a CPU).
The configured module does not support display of the diagnostics status (valid for
modules under a CPU).
The connection is established, but the module status has not yet been determined
or is unknown.
Hardware error in lower-level component: A hardware fault has occurred in at least
one lower-level hardware component (occurs as a separate symbol only in the
project tree).