IF[N] - Digital Input Filter
Purpose:
Filters the drive digital inputs in order to overcome switch bounding. IF[N] defines a
time period in milliseconds. Input pulses of shorter duration than IF[N] are rejected.
Pulses longer than IF[N] in milliseconds are sensed.
Each index entry [1 - 10] refers to a digital input [1 - 10] respectively. The input filtering is
accomplished by the software. For this reason, in order to ensure that an input pulse is
sensed, its length must be IF[N]+2*TS, where TS is the sampling time.
Example:
If the speed sampling time is 210 microseconds and IF[1]=1, the minimum stable time
for an input change to be sensed is 1050 microseconds (210*5). A pulse must be at least
1 millisecond+2*210 microseconds =1.42 millisecond long in order to ensure that it is
captured by the digital input.
Attributes: Type: Parameter, Float
Source: Program, RS-232, CANopen
Restrictions: None
Default values: 0 (RS), Non-volatile
Range: [0…1000] msec
Index range: [1…10] … refer to the first note
Unit modes: All
Activation: Immediate
Notes:
Elmo drives supports a different number of digital inputs. Accordingly, the index
range may differ between drives. Please consult the drive’s Installation Guide for
information about its digital inputs.
If input 5 or 6 is used as Home input, the corresponding parameter — IF[5] or
IF[6]— does not apply. Parameter EF[1] or EF[2] is used instead.
The IF[N] commands can also be applied in simulation mode.
SimplIQ Command Reference Manual Alphabetical Listing
MAN-SIMCR (Ver. 4.5)
3-67
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