ABB S800 I/O - Page 77

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A digital input signal can be checked as shown in Figure 2-21. Use the
following procedure as a guide:
– Simulate the digital input signal as close to the process transducer as
possible or activate the transducer itself.
– Check that the corresponding yellow LED on the input module concerned
illuminates and that the change is shown accordingly in the overlaying
controller
– Change the input signal to a low level. Check that the yellow LED on the
input board extinguishes and that the display value has changed.
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Figure 2-21 shows where an analog input signal of an input channel can be
checked. Proceed as follows to check an analog input channel:
– Simulate the analog input signal as close to the process
transmitter/transducer as possible.
– Check that the simulated signal is available at the screw terminal of the
corresponding connection.
– Check that the value shown on the display screen corresponds to the
simulated value set in the field. Check the complete signal range.
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Figure 2-22 shows where an output signal can be checked in an S800 I/O
application.
DO Modules provide a field output connector and DO channel LED’s.
AO Modules provide a field output connector.