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REC 523
5.4.2.2.
5.4.2.3.
36
Remote Monitoring and Control Unit
Technical Reference Manual
t
0
Input
Filtered Input
Filter Time
Fig. 5.4.2.1.-1 Filtering of a digital input
In the figure above, the input signal is named "Input", the filter timer "Filter" and
the filtered input signal "Filtered Input". At the beginning, the input signal is at high
state, the short low state is filtered and no input status change is detected. The low
state starting from the time t
in the input status is detected and the time tag attached to the input change is t
high state starting from t
Each digital input has a filter time parameter Input # filter, where "#" is the
number of the digital input of the module in question (for example Input 1 filter).
Parameter
Input # filter
a. In the REC 523 revision F or later. In earlier revisions the value is 1...65535 ms.
Inversion of a digital input
The parameter Input # invert. can be used to invert a digital input:
Control voltage
No
Yes
No
Yes
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 state is FALSE (0)
when a control voltage is applied to the terminals of the digital input.
Parameter
Input # invert.
Pulse counters
Some specific digital inputs (refer to Section 5.4. Digital inputs) of REC 523 can be
programmed 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).
t
1
Filter Time
exceeds the filter time, which means that the change
0
is detected and the time tag t
1
Values
a
1....15000 ms
Input # invert.
Status of digital input
0
0
1
1
Values
0 (not inverted)
1 (inverted)
1MRS750881-MUM
is attached.
1
Default
5 ms
FALSE (0)
TRUE (1)
TRUE (1)
FALSE (0)
Default
0
Dipo
. The
0
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