1MRS750527-MUM
REF 54_
45
Feeder Terminal
Technical Reference Manual, General
5.1.7.2. Inversion of a digital input
The parameter “Input # invert” can be used to invert a digital input:
When the digital input is inverted, the state of the input is TRUE (1) when no control
voltage is applied to its terminals. Accordingly, the input state is FALSE (0) when a
control voltage is applied to the terminals of the digital input.
5.1.7.3. Pulse counters
Some specific digital inputs (refer to Section “Digital inputs” on page 43) 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 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.
dipo2_b
Fig. 5.1.7.3.-1 Principle of pulse counter function
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.
Control voltage Input # invert State of digital input
No 0 FALSE (0)
Yes 0 TRUE (1)
No 1 TRUE (1)
Yes 1 FALSE (0)
Parameter Values Default
Input # invert 0 (not inverted) 0
1 (inverted)
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