1MRS750881-MUM
REC 523
37
Remote Monitoring and Control Unit
Technical Reference Manual
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
parameter
increases in the range 0... 2147483647. The pulse counters are updated with a period
of 500 ms.The frequency range of a digital input parametrized to operate as a pulse
counter is 0.....100 Hz.
Dipo_b
Fig. 5.4.2.3.-1 Principle of pulse counter function
Counter settings
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
All the updated values of the
Input # preset
parameters are then copied to the
corresponding
Input # counter
parameters.
Writing the value 2 to the
Counter trigger
parameter copies all the
Input #
preset
parameter values to the corresponding
Input # counter
parameters.
Writing the value 0 clears all the counters.
5.4.2.4.
Oscillation suppression
Oscillation suppression is used to reduce the load from the system when, for some
unrecognized reason, a digital input starts oscillating. A digital input is regarded as
oscillating if the number of valid status changes (= number of events after filtering)
during 1second is greater than the set value
Input osc. level
(Oscillation
level). During oscillation, the digital input is blocked (status is invalid) and an event
is generated. The state of the input does not change when it is blocked, that is, its
state depends on the condition before blocking.
Table 5.4.2.3-1 Counter setting parameters
Parameter
Values
Default
Input # preset
0..... 2147483647
0
Input # mode
1 = digital input
2 = counter
1
Counter trigger
0 = clear all counters
1 = load updated
Input # preset
values
2 = load all
Input # preset
values
Filtered
Input
Counter
