Omron SYSMAC CPM2B Operation Manual page 60

Wiring and Connections
High-speed Counter Input Connection Examples
Differential Phase Mode
(Count frequency: 5 kHz)
E6B2-CWZ6C
Encoder
Black
(NPN open-col-
lector output)
White
Orange
Brown
Blue
Leakage Current
Inductive Loads
1, 2, 3...
48
Special functions for input bits IR 00003 through IR 00006 are set in DM 6628:
Bit Bits in
address DM 6628
IR 00003 00 to 03
IR 00004 04 to 07
IR 00005 08 to 11
IR 00006 12 to 15
CPM2B
00000 A-phase input
00001 B-phase input
00002 Z-phase input
COM
24 V DC
A leakage current can cause false inputs when using 2-wire sensors (proximity
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.
2-wire sensor, etc.
I: Device's leakage current (mA)
R: Bleeder resistance (kΩ)
W: Bleeder resistor's power rating (W)
The equations above were derived from the following equations:
I
W y
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.)
When connecting an inductive load to an input, connect a diode in parallel with
the load. The diode should satisfy the following requirements:
1. Peak reverse-breakdown voltage must be at least 3 times the load voltage.
PC Setup setting (in DM 6628)
0
Used as normal Used as interrupt
inputs. inputs (including
counter mode).
Pulse Plus Direction Input mode
(Count frequency: 20 kHz)
E6A2-CS5C
Encoder
Sensor or
switch
Sensor or
switch
Input power
supply
R
Bleeder
resistor
L
I
C
E
L 5.0
C
R +
kW max.
I L –5.0
C
Input voltage (24)
R
Input Current (I )
C
x OFF voltage (E
Input voltage (24)
R )
Input Current (I )
C
Input voltage (24)
Input voltage (24)
R
Section
1
Used as
quick-response
inputs.
CPM2B
00000 Pulse input
00001 Direction input
00002 Reset input
Sensor
power
COM
24 V DC
CPM2B
: CPM2B's input impedance (kΩ)
C
: CPM2B's input current (mA)
: CPM2B's OFF voltage (V) = 5.0 V
C
W + 2.3
W min.
R
: 5.0)
C
tolerance (4)
, I , and E .
C C C
3-5
2