SMC Networks Reed Switch Solid State Switches - Manual (Page 11)

Most sensitive position
Auto Switch Internal Circuit
D-A79W
Auto Switch Specifications
Weight
Dimensions
Grommet
Indicator light/Display method
Auto switch model
0.5
3
5
11
53
—
D-A79W
Lead wire length
(m)
Note 1) Operating load is an induction load.
Note 2) Wiring to the load is 5 m or longer.
Use the contact protection box in any of the
above listed situations. The contact point life
may decrease. (Refer to page 12-13-5 for
contact protection box.)
D-A79W (With indicator light)
PLC: Abbreviation of Programmable Logic Controller
Auto switch model
Applicable load
Load voltage
Load current range (3)
Contact protection circuit
Internal voltage drop
Indicator light
D-A79W
Relay, PLC
24 VDC
5 to 40 mA
None
4 V or less
Reed switch
LED
OUT ( + )
Brown
OUT ( – )
Blue
• Lead wire — Oil resistant vinyl heavy-duty cord, ø3.4, 0.2 mm 2 , 2 cores (Brown, Blue), 0.5 m
Note 1) Regarding the common specifications of the reed switches, refer to page 12-13-5.
Note 2) Regarding the lead wire length, refer to page 12-13-5.
Note 3) Under 5 mA, the strength of the indicator light is poor. In some cases, visibility of the
indicator light will not be possible where the output signal is less than 2.5 mA. However,
there is no problem in terms of contact output, when an output signal exceeds 1 mA or
more.
The optimum operating position
can be determined by the color
of the light.
(Red
→ Green ← Red)
Operating range
Indication
Green Red Red
Optimum operating position
(g)
Main circuit
of switch
2-color Indication Type Reed Switch
Rail Mounting Style
D-A79W
Operating position······Red LED lights when ON.
Optimum operating position······Green LED lights when ON.
Reverse flow
prevent diode
For details about certified products
conforming to international standards,
visit us at www.smcworld.com.
12-13-11
1st
MHZ
MHF
MHL
MHR
MHK
MHS
MHC
MHT
MHY
MHW
MRHQ
Misc.
D-
20-
12_13_D-.qxd 04.7.6 18:02 Page 13-11
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