Testing/Commissioning/
Diagnostics
66
04/99 AWB 27-1184 GB
Diagnostics Status information is scanned hierarchically using
the diagnostics status word and the station’s
diagnostics byte as well as the diagnostics bytes of
any local expansion modules which are connected to
it.
Diagnostics status word
The diagnostics status word provides an overview of
the various error messages. It consists of 16 bits. The
diagnostics bits are subdivided into two categories:
Category D (diagnostics): bits 0 - 7
Category E (error): bits 8 - 15
The diagnostics bits in category D have an indication
function. They can become set while the PLC is still
in the “Run” or “Ready” status.
The diagnostics bits in category E cause the PLC to
be switched to the “Not Ready” status.
The diagnostics bits are displayed in the System
Diagnostics window of Sucosoft S 40 (see manual
“Sucosoft S 40” User Interface AWB2700-1305GB,
chapter 8).
The diagnostics bits can also be displayed on the
controller’s input LEDs. For this proceed as follows:
왘 Set the operating mode selector switch to “Halt”
and refer to the following tables to interpret the
controller’s operating state. Press the “Reset”
button if you want to acknowledge the error
signals.
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