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BasicController CR0403
4.4.2 Configure inputs
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Content
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Valid operating modes → chapter Possible operating modes inputs/outputs
Safety instructions about Reed relays
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For use of non-electronic switches please note the following:
Contacts of Reed relays may be clogged (reversibly) if connected to the device inputs without series resistor.
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► Remedy: Install a series resistor for the Reed relay:
Series resistor = max. input voltage / permissible current in the Reed relay
Example: 32 V / 500 mA = 64 Ohm
► The series resistor must not exceed 5 % of the input resistance RE of the device input → data sheet). Otherwise, the signal will not be detected as TRUE.
Example:
RE = 3 000 Ohm
max. series resistor = 150 Ohm
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Analogue inputs: configuration and diagnosis
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Configuration of each input is made via the application program:
• FB INPUT
► If the analogue inputs are configured for current measurement, the device switches to the safe voltage measurement range (0...32 V DC) and the output RESULT is set accordingly in the function block INPUT when the final value (23 mA for > 40 ms) is exceeded. After about one second the input automatically switches back to the current measuring range.
As an alternative, an analogue channel can also be evaluated binarily.
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In = pin multifunction input n
(CR) = device
(1) = input filter
(2) = analogue current measuring
(3a) = binary-input plus switching
(3b) = binary-input minus switching
(4a) = analogue voltage measuring 0...10 V
(4b) = analogue voltage measuring 0...32 V
(5) = voltage
(6) = reference voltage
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Figure: principle block diagram multifunction input
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BasicController CR0403
Configure the software filters of the inputs
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Via the input FILTER in the FB INPUT
(→ p. 171 ) a software filter can be configured which filters the
measured input voltage at the analogue inputs.
The filter behaves like a low-pass filter; the filter frequency is set with the value entered in FILTER. For
FILTER, values from 0...8 are permitted.
Table: limit frequency software low-pass filter at the analogue input
FILTER
0
Filter frequency [Hz]
Filter deactivated
0…70 %
Step response [ms] for ...
0…90 % 0…99 %
Remarks
6
7
4
5
1
2
3
120
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22
10
5
2.5
1.2
2
5
10
19
38
77
154
8 0.7 308 589
The following statements of the step response are relevant:
• Input analogue: 0...90 % and 0...99 %
• Input binary: 0...70 %
4
9
18
36
73
147
294
7
17
35
72
146
293
588
1177 recommended
Figure: course of time binary signal at the input upon switch-on / switch-off
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