FX Series Positioning Controllers Wiring 3
3-7
Selecting DC input device
Example: Following products manufactured by OMRON
Micro switch: Z, V, D2RV Proximity switch: TL, E2M
Operation switch: A3P Photoelectric switch:E3S, E3N
Imperfect contact may occur when a switch for large current is used.
Input device with diodes connected in series
Make sure that the voltage drop of the diodes connected in series is approximately 4 V or less.
Accordingly, in the case of a lead switch with LEDs connected in series, two or less LEDs can
be connected in series.
Input device with resistors connected in parallel or two-wired proximity switches.
Make sure that the parallel resistance Rp is 15 k
Ω
or more.
When Rp is less than 15 k
Ω
, connect a bleeder resistor Rb satisfying the following formula
between the [24+] and [IN] terminals.
Make sure that the leak current I is 1.5 mA or less when the two-wired proximity switch is
turned OFF.
When I exceeds 1.5 mA, connect a bleeder resistor Rb satisfying the following formula in the
same way.
LED
IN
COM
+24V
LED
IN
Bleeder
resistor
Rb
Rp
COM
15k
W
or
more
Rb
≤
15-Rp
(k
Ω
)
4Rp
Rb
≤
I - 1.5
(k
Ω
)
6
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