Festo 03 - Page 134

Input/output modules
There are one or two LEDs (status displays)
next to the relevant connections on the input/out-
put modules. The colours of these LEDs are:
• green (status display of the digital inputs)
• yellow (status display of the digital outputs)
• red (error display of the digital outputs)
The current signal at each input/output is shown
by means of the yellow and green LEDs. The
red LEDs of the outputs indicate short circuit or
overload of the relevant output.
Red LEDs
(short circuit/overload
display for outputs)
Yellow LEDs
(switching status
display for outputs)
Green LEDs
(switching status
display for inputs)
I8
I8
I4
O4
Fig. 5/6: LED display of input/output modules
LED Status
Yellow out
or
green out
Logic 0
(no signal)
Yellow alight
or
green alight
Logic 1
(signal present)
Red out Output without short circuit/overload
Red alight Short circuit/overload at relevant output
VIFB6 - 03/05 5. Diagnosis/Error Treatment
9809c 5-9