ABB S800 I/O - Page 76

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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.
Digital and analog output signals are obtained by setting the required values from
the overlaying controller.
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Figure 2-21 shows where an input signal can be checked in an S800 I/O application.
DI modules provide a field input connector and DI channel LED’s, and AI modules
provide a field input connector.
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Controller
MTU
Input
Module
DI/AI ch.
Engineering Tool
Application
FCI
Fieldbus
Interface
Process
Process
Device