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Inside EZD
MN05013005E
396
Transfer behavior
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
• Decentralized 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 power supply of the expansion unit is not present, no
connection can be established between it and the 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.
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.
Warning!
Continuously monitor the functionality of the EZD
expansion in order to prevent switching errors in the
machine or plant.
