Omron CPM2C User Manual

115
Wiring and Connections Section 3-4
Special functions for input bits IR 00003 through IR 00006 are set in
DM 6628:
Note *These inputs must be set as normal inputs (setting: 0) when a CPU Unit with
10 I/O points is being used.
High-speed Counter Input Connection Examples
Leakage Current 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. 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.
Bit
address
Bits in
DM 6628
PC Setup setting (in DM 6628)
012
IR 00003 00 to 03 Used as normal
inputs.
Used as interrupt
inputs (including
counter mode).
Used as quick-
response inputs.
IR 00004 04 to 07
IR 00005 08 to 11*
IR 00006 12 to 15*
Differential Phase Mode
(Count frequency: 5 kHz)
E6B2-CWZ6C
Encoder
(NPN open-col-
lector output)
24 VDC
00000 A-phase input
00001 B-phase input
COM
00002 Z-phase input
Pulse Plus Direction Input mode
(Count frequency: 20 kHz)
E6A2-CS5C
Encoder
24 VDC
00000 Pulse input
00001 Direction input
COM
00002 Reset input
Sensor or
switch
CPM2C CPM2C
Sensor or
switch
Sensor
power
Black
White
Orange
Brown
Blue
R CPM2C
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)
The equations above were derived from the following equations:
L
C
: CPM2C's input impedance (kΩ)
I
C
: CPM2C's input current (mA)
E
C
: CPM2C's OFF voltage (V) = 5.0 V
The input impedance, input current, and OFF voltage may vary depending on the i
n
put being used. (IN00000 through IN00002 have different values.)
W =
R =
W min.
kΩ max.
L
C
× 5.0
I × L
C
− 5.0
× Input voltage (24) × tolerance (4)W ≥
Input voltage (24)
R
I ×
≤ OFF voltage (E
C
: 5.0)
R ×
Input voltage (24)
Input current (I
C
)
R +
Input voltage (24)
Input current (I
C
)
2.3
R
Refer to 2-1-3 I/O Specifications for details on the values L
C
, I
C
, and E
C
.

Omron CPM2C Specifications

General

Brand	Omron
Model	CPM2C
Category	Controller
Language	English