ABB CL Series, Applications Manual

Page: 382 / 428

Expanding the display system
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1SVC 440 795 M1100
Transfer behaviour
The input and output data of the expansion units is
transferred serially in both directions. Take into account the
modified reaction times of the inputs and outputs of the
expansion units:
Input and output reaction times of expansion units
The debounce setting has no effect on the expansion unit.
Transfer times for input and output signals:
• Local expansion
– Time for inputs R1 to R12: 30 ms + 1 cycle
– Time for outputs S1 to S6 (S8): 15 ms + 1 cycle
• Remote expansion
– Time for inputs R1 to R12: 80 ms + 1 cycle
– Time for outputs S1 to S6 (S8): 40 ms + 1 cycle
Function monitoring of expansion units
If the expansion device is not fed with power, there is no
connection between it and the display system. The
expansion inputs R1 to R12, R15, R16 are incorrectly
processed in the display system and show status 0. It cannot
be assured that the outputs S1 to S8 are transferred to the
expansion unit.
The status of the internal input I14 of the display system
indicates the status of the expansion unit:
• I14 = 0: Expansion unit is functional
• I14 = 1: Expansion unit is not functional
Warning!
Ensure the continuous monitoring of the display system
expansion devices in order to prevent switching faults in
machines or systems.