62
Wiring and Connections
Section 3-5
Special functions for input bits IR 00003 through IR 00006 are set in
DM 6628:
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 (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.
Bit
address
Bits in
DM 6628
PLC Setup setting (in DM 6628)
0
1
2
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)
24 V DC
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 V DC
00000 Pulse input
00001 Direction input
COM
00002 Reset input
Sensor or
switch
CPM2B
CPM2B
Sensor or
switch
Sensor
power
Black
White
Orange
Brown
Blue
E6B2-CWZ6C
Encoder
(NPN open-col-
lector output)
R
CPM2B
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
: CPM2B's input impedance (k
Ω
)
I
C
: CPM2B's input current (mA)
E
C
: CPM2B's OFF voltage (V) = 5.0 V
R =
L
C
×
5.0
I
×
L
C
−
5.0
k
Ω
max.
W =
R
2.3 W min.
Input voltage (24)
Input Current (I
C
)
R
×
Input voltage (24)
Input Current (I
C
)
R +
I
×
≤
OFF voltasge (E
C
: 5.0)
Input voltage (24)
R
W
≥
×
Input voltage (24)
×
tolerance (4)
Refer to2-1-3 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.)
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