Omron SYSMAC CPM2B-S001M-DRT Operation Manual page 60

Wiring and Connections
High-speed Counter Input Connection Examples
Leakage Current
48
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Special functions for input bits IR 00003 through IR 00005 are set in
DM 6628:
Bit
address
IR 00003
IR 00004
Differential Phase Mode
(Count frequency: 5 kHz)
E6B2-CWZ6C
Encoder
Black
(NPN open-col-
lector output)
White
Orange
Brown
Blue
24 V DC
A leakage current can cause false inputs when using 2-wire sensors (proxim-
ity switches or photoelectric switches) or limit switches with LEDs. False
inputs won't occur if the leakage current is less than 1.0 mA (2.5 mA for
IN00000 to IN00002). If the leakage current exceeds these values, insert a
bleeder resistor in the circuit to reduce the input impedance, as shown in the
following diagram.
Bits in
DM 6628
0
00 to 03 Used as normal
inputs.
04 to 07
Pulse Plus Direction Input mode
CPM2B-S
E6A2-CS5C
00000 A-phase input
Encoder
00001 B-phase input
00002 Z-phase input Sensor or
switch
COM
Sensor or
switch
Input power
supply
Bleeder
resistor
2-wire sensor, etc.
I: Device's leakage current (mA)
R: Bleeder resistance (kΩ)
W: Bleeder resistor's power rating (W)
× 5.0
L
C
R = KΩ max.
l × L − 5.0
C
The equations above were derived from the following equations:
Input voltage (24)
R ×
Input Current (l
l =
Input voltage (24)
R +
Input Current (l
Input voltage (24)
W ≥ × Input voltage (24) × tolerance (4)
R
Refer to 2-1-3 I/O Specifications for details on the values L
The input impedance, input current, and OFF voltage may vary depending
on the input being used. (IN00000 through IN00002 have different values.)
PC Setup setting (in DM 6628)
1
Used as interrupt Used as
inputs (including quick-response
counter mode). inputs.
(Count frequency: 20 kHz)
CPM2B-S
00000 Pulse input
00001 Direction input
00002 Reset input
Sensor
power
COM
24 V DC
R
CPM2B-S
L : CPM2B's input impedance (kΩ)
C
I : CPM2B's input current (mA)
C
E : CPM2B's OFF voltage (V) = 5.0 V
C
2.3
W = W min.
R
)
C ≤ OFF voltage (E
: 5.0)
C
)
C
, I , and E
C C
Section 3-5
2
.
C