D-A73H SMC Corporation, D-A73H Datasheet - Page 5
![no-image](/images/no-image-200.jpg)
D-A73H
Manufacturer Part Number
D-A73H
Description
Sensor, reed switch, rail mount, grommet connection, for CQ2/NCQ2 cylinders
Manufacturer
SMC Corporation
Type
Hall Effectr
Datasheet
1.D-A93.pdf
(95 pages)
Specifications of D-A73H
Function
Proximity
Primary Type
Proximity
Technology
Reed
- Current page: 5 of 95
- Download datasheet (5Mb)
Basic Wiring
Example of Connection with PLC (Programmable Logic Controller)
Example of AND (Series) and OR (Parallel) Connection
Solid state 3-wire, NPN
• Sink input specifications
6-16-8
• 3-wire
• 2-wire
(Power supply for switch and load are separate)
2-wire
3-wire, NPN
2-wire with 2-switch AND connection
Example: Power supply is 24 VDC
AND connection for NPN output
(Using relays)
Switch
Switch
Load voltage at ON = Power supply voltage – Residual voltage x 2 pcs.
Main
curcuit
of switch
Main
curcuit
of switch
Switch 1
Switch 2
Switch 1
Switch 2
Internal voltage drop in switch is 4 V.
Black
Brown
Blue
Brown
Blue
Brown
Black
Blue
Brown
Black
Blue
Brown
Blue
Brown
Blue
= 24 V – 4 V x 2 pcs.
= 16 V
Before Operation
Auto Switches Connection and Example
Brown
Black
Blue
Brown
Black
Blue
Relay
Relay
COM
COM
Input
Input
Load
Load
Load
PLC internal circuit
PLC internal circuit
When two switches are
connected in series, a load
may malfunction because
the load voltage will decline
when in the ON state.
The indicator lights will light
up when both of the
switches are in the ON
state.
Solid state 3-wire, PNP
Main
curcuit
of switch
Relay
contact
Load
• Source input specifications
Brown
Black
Blue
3-wire, PNP
2-wire
Switch
Switch
Load
AND connection for NPN output
(Performed with switches only)
The indicator lights will light up when
both switches are turned ON.
Load voltage at OFF = Leakage current x 2 pcs. x Load impedance
Example: Load impedance is 3 kΩ.
2-wire with 2-switch OR connection
Switch 1
Switch 2
Switch 1
Switch 2
Black
Brown
Blue
Blue
Brown
Leakage current from switch is 1 mA.
Solid state 2-wire
Brown
Black
Blue
Brown
Black
Blue
Main
curcuit
of switch
Main
curcuit
of switch
Brown
Blue
Brown
Blue
COM
COM
= 1 mA x 2 pcs. x 3 kΩ
= 6 V
Input
Input
Load
Load
PLC internal circuit
PLC internal circuit
Brown
Blue
Brown
Blue
(Solid state switch)
When two switches are
connected in parallel,
malfunction may occur
because the load voltage
will increase when in the
OFF state.
Load
Load
OR connection for NPN output
Connect according to the applicable PLC
input specifications, as the connection
method will vary depending on the PLC
input specifications.
Switch 1
Switch 2
Reed switch 2-wire
Indicator
protection
circuit,
etc.
Indicator
protection
circuit,
etc.
Brown
Black
Blue
Brown
Black
Blue
(Reed switch)
Because
current leakage, the load
voltage will not increase
when
However, depending
the number of switches in
the
indicator
sometimes grow dim or
not light up, due to the
dispersion and reduction
of the current flowing to
the switches.
Blue
Brown
Brown
ON
Blue
turned
Load
there
Load
Load
lights
state,
is
OFF.
may
the
no
on
~
~
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