IDEC MICRO3 User Manual

4: SPECIAL FUNCTIONS
USER’S MANUAL 4-5
Example: Receiving Minimum Pulse Width of 150 µsec
When input I0 is required to receive short pulses of 150 µsec minimum using the catch input function, the preset value N
for the hard filter is calculated as follows. From Equation A on page 4-4,
150 = 2.4N + 4
N = 60.8
Set the hard filter preset value N to 60 or less to catch short input ON pulses of 150 µsec.
Example: Eliminating Input Signals of 150 µsec
When input I0 is required to eliminate noise signals of 150 µsec or less using the catch input function, the preset value N
for the hard filter is calculated as follows. From Equation B on page 4-4,
150 = 0.8N – 1
N = 188.75
Set the hard filter preset value N to 189 or more to eliminate input pulses of 150 µsec. When N is set to 189, the minimum
input signal width that can be received is calculated as follows. From Equation A on page 4-4,
2.4 × 189 + 4 = 457.6 µsec
Soft Filter
The soft filter can be set to 0 msec, 3 msec, 7 msec, or 10 msec for normal inputs I0 through I7 in four groups, using FUN7
on the program loader. See page 5-6.
When the soft filter is set to 0 msec, the filtering function depends on the hard filter.
When the soft filter is set to 3 msec, 7 msec, or 10 msec, the soft filter is enabled to filter input signals. The input accept or
reject areas for each setting are shown below.
Normal inputs require pulse widths of the above value plus 1 scan time to read the input signal.
The soft filter can be set in four groups of inputs.
Pulse Output Function
MICRO
3
features a pulse output function which can be used for illumination control and pulse-driven machines such as
machine tools and conveyors. For details, see the PULS (pulse output) instruction on page 16-1 and PWM (pulse width
modulation) instruction on page 16-3.
High-speed Counter Function
MICRO
3
features high-speed counter functions which can be used for position control by counting high-speed pulses or for
simple motor control in combination with the pulse output. For details, see page 17-1.
Soft Group Input Number
G1 I0
G2 I1
G3 I2, I3
G4 I4, I5, I6, I7
Indefinite
1 msec 3 msec
Reject Input Accept Area
3 msec
IndefiniteInput Reject Area Input Accept Area
5 msec 7 msec
7 msec
Input Accept AreaIndefiniteInput Reject Area
8 msec 10 msec
10 msec
On the 10-I/O type MICRO
3
base unit, only inputs I4 and I5 are
available for group G4.

IDEC MICRO3 Specifications

General

Brand	IDEC
Model	MICRO3
Category	Controller
Language	English