IDEC SMARTRELAY User Manual page 43

Take into account the quiescent current of any two-wire proximity switches that you use. The
level of the quiescent current of some two-wire proximity switches is high enough to trigger a
logical "1" signal at the IDEC SmartRelay input. You should therefore compare the quiescent
current of the proximity switches with the Technical data (Page 283).
Remedy
To suppress this response, use an X1/X2-type capacitor rated at 100 nF and 275 VAC. In a
destructive situation, this type of capacitor safely disconnects. You must choose the voltage
level for which the capacitor is rated such that it is not destroyed in the case of overvoltage!
At 230 VAC, the voltage between N and an input I(n) must not be greater than 40 V to
guarantee a "0" signal. You can connect approximately ten glow lamps to the capacitor.
Restrictions
Signal status transitions 0 → 1/1 → 0
After a 0 to 1 or 1 to 0 transition, the signal must remain constant at the input at least for the
duration of one program cycle, so that IDEC SmartRelay can detect the new signal status.
The size of the circuit program determines the program execution time. The appendix
"Determining the cycle time (Page 303)" contains a benchmark test routine that you can use
to determine the current scan cycle time.
Special features of FL1F-H12RCE/B12RCE and FL1F-H12SCD
Fast digital inputs: I3, I4, I5 and I6
These modules include fast digital inputs (up/down counters, frequency triggers). The
restrictions mentioned earlier do not apply to these fast digital inputs.
Note
Expansion modules do not have fast digital inputs.
Analog inputs: I1 and I2, I7 and I8
You can use the inputs I1, I2, I7 and I8 of IDEC SmartRelay versions FL1F-H12RCE/B12RCE
and FL1F-H12SCD as either digital inputs or analog inputs. The IDEC SmartRelay circuit
program defines the input mode (digital or analog).
The inputs I1, I2, I7 and I8 provide digital inputs, and the inputs AI3, AI4, AI1 and AI2 provide
analog inputs, as described in the topic "Constants and connectors (Page 111)". AI3
corresponds to the input terminal I1; AI4 corresponds to I2; AI1 corresponds to I7; AI2
corresponds to I8. The use of AI3 and AI4 is optional. You configure your IDEC SmartRelay to
use either two or four analog inputs as the topic "Setting the number of AIs in IDEC
SmartRelay (Page 264)" describes.
When using inputs I1, I2, I7 and I8 as analog inputs, only the range from 0 to 10 VDC is
available.
IDEC SmartRelay Manual
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IDEC SmartRelay installation and wiring
2.3 Wiring IDEC SmartRelay
31