Omron CPM2C, Operation Manual

Page: 76 / 163

3-4 Section
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Special functions for input bits IR 00003 through IR 00006 are set in DM 6628:
Bit
dd
Bits in
DM 6628
PC Setup setting (in DM 6628)
address DM 6628
0 1 2
IR 00003 00 to 03
Used as normal
i Used as interrupt
i
(i l di
Used as
i k
IR 00004 04 to 07
inputs. inputs (including
counter mode) quick-response
inputs
IR 00005 08 to 11*
counter mode). inputs.
IR 00006 12 to 15*
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
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
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. 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.
R
CPM2C
Input power
supply
Bleeder
resistor
2-wire sensor, etc.
I: Device’s leakage current (mA)
R: Bleeder resistance (k
Ω
)
W: Bleeder resistor’s power rating (W)
The equations above were derived from the following equations:
L
C
: CPM2C’s input impedance (k
Ω
)
I
C
: CPM2C’s input current (mA)
E
C
: CPM2C’s OFF voltage (V) = 5.0 V
R
L
C
5.0
I L
C
–5.0
k max.
W
2.3
R
W min.
I
R
Input voltage (24)
Input current (I
C
)
R
Input voltage (24)
Input current (I
C
)
OFF voltage (E
C
: 5.0)
W
Input voltage (24)
R
Input voltage (24) tolerance (4)
Refer to 2-2-3 I/O Specifications for details on the values L
C
, I
C
, and E
C
.
The input impedance, input current, and OFF voltage may vary depending on the
input being used. (IN00000 through IN00002 have different values.)
Leakage Current