ABB S800 I/O User Manual page 76

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Digital and analog output signals are obtained by setting the required values from
the overlaying controller.
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Figure 2-21
DI modules provide a field input connector and DI channel LED's, and AI modules
provide a field input connector.
66
transducer as possible to test the process wiring as far as possible. Manual
operation of transducers, for example, limit switches can also give the required
change for the input signals.
Analog input signals: Use a signal generator for analog signals. A simple test
coupling can be used as a voltage source. This can consist of a potentiometer
across a suitable voltage source which gives +/- voltage. A current source,
which can give sufficient current, for example, 20 mA, is required for current
signals. Analog input test signals should be entered as close to the
transmitter/transducer as possible to test the process wiring.
shows where an input signal can be checked in an S800 I/O application.
Process
Process
Device
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Engineering Tool
MTU
FCI
Fieldbus
Input
Interface
Module
DI/AI ch.
Controller
Application
3BSE 020 923R101