Function Monitoring Of Expansion Units - ABB CL Series Applications Manual

Inside the logic relay
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Transfer times for input and output signals:
• Central expansion
Time for inputs R1 to R12:
30 ms + 1 cycle time
• Time for outputs S1 to S6 (S8):
15 ms + 1 cycle
• Remote expansion
Time for inputs R1 to R12:
80 ms + 1 cycle time
• Time for outputs S1 to S6 (S8):
40 ms + 1 cycle

Function monitoring of expansion units

If the power supply of the expansion unit is not present, no
connection can be established between it and basic unit. The
expansion inputs R1 to R12, R15, R16 are incorrectly
processed in the basic unit and show status 0. It cannot be
assured that the outputs S1 to S8 are transferred to the
expansion unit.
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Warning!
Ensure the continuous monitoring of CL expansion devices
in order to prevent switching faults in machines or
systems.
The status of the internal input I14 of the basic unit indicates
the status of the expansion unit:
• I14 = "0": expansion unit is functional
• I14 = "1": expansion unit is not functional
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When the power supply is switched on, basic units and
expansion devices may require different power up times to
reach full functionality. If the basic unit is powered up
faster, the internal monitoring input I14 will have status 1,
indicating that an expansion device is not functional.
1SVC 440 795 M0100