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Technical Reference Manual, General
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39
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The parameter “Input # invert” can be used to invert a digital input:
When the digital input is inverted, the status of the input is TRUE (1) when no
control voltage is applied to its terminals. Accordingly, the input status is FALSE
(0) when a control voltage is applied to the terminals of the digital input.
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Some specific digital inputs (refer to section “Digital inputs” on page 37) of the REF
54_ feeder terminal can be programmed either as digital inputs or as pulse counters.
This programming is done via the parameter “Input # mode” (in this parameter as
well as in others mentioned below, # denotes the input number).
When an input operates as a digital input, no counting is done but the pulse counter
value remains at the present value.
When an input operates as a pulse counter, the positive input transitions (0 -> 1) of
a filtered input are counted and the counter value of “Input # counter” increases in
the range 0... 2147483647. The pulse counters are updated with a period of 500 ms.
The frequency range of a digital input parameterized to operate as a pulse counter is
0.....100 Hz.
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The parameter “Input # preset” can be used to give a counter the start value.The start
value is loaded into the counter by:
• writing the desired start value to the parameter “Input # preset”,
• writing the value 1 to the parameter “Counter trigger”. Then all the updated
values of the “Input # preset” parameters are copied to the corresponding “Input #
counter” parameters.
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No
0
FALSE (0)
Yes
0
TRUE (1)
No
1
TRUE (1)
Yes
1
FALSE (0)
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Input # invert
0 (not inverted)
0
1 (inverted)
dipo_b
Filtered
Input
Counter
