ABB S800 I/O User Manual page 78

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When checking analog output signals, use a multimeter to test for an output signal
over the complete signal range.
68
Controller
Application
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Typical digital output channels and where the signals can be tested are shown
in Figure 2-22. Digital output signals in a specific plant are shown in the
terminal diagrams for the plant.
Proceed as follows to check digital channels:
– Check that the corresponding output shows that it is set to on. Then check
the value on the screw terminal block of the corresponding MTU, and if
practical, at the process device also.
– Check that the corresponding yellow LED on the digital output module
illuminates.
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Typical analog output channels and where the signals can be tested are shown
in Figure 2-22. Analog output signals in a specific plant are shown in the
connection diagrams for the plant.
Engineering Tool
MTU
FCI
Fieldbus
Output
Interface
Module
DO/AO ch.
Process
Process
Device
3BSE 020 923R101