Expanding EZD
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MN05013005E
397
Example
Power can be applied to the expansion unit later than the
basic unit. This means that the basic unit is switched to RUN
when the expansion unit is absent. The following EZD circuit
diagram detects if the expansion unit is functional or not
functional.
Figure 195: Circuit diagram for expansion testing
As long as I 14 is 1, the remaining circuit diagram is skipped.
If I 14 is 0, the circuit diagram is processed. If the expansion
unit drops out for any reason, the circuit diagram is skipped.
M 01 detects whether the circuit diagram was processed for at
least one cycle after the power supply is switched on. If the
circuit diagram is skipped, all the outputs retain their previous
state.
I 14----m 01-------------------Ä : 08
------------------------------S M 01
I 14--------------------------Ä : 08
I 01--u-I 02------------------Ä Q 01
Q 01--k