Mitsubishi MELSEC F FX-40DU-E Handy Manual page 18

2.
INSTALLATION, WIRING AND GENERAL SPECIFICATIONS
Specifications
/
Input Signal Voltage Input Slgnel Cutreni Circuit Insulation Input Response Time Points
I....
*
Diode in series with input contact
24V D C + l O %/-I5
%
*
Resistor in parallel with input contact
The voltage drop caused by the diode must be kept within a
maximum of 4 volts. Accordingly, when series reed switches
with LEDs are used, no more than two can be connected in
series.
Cautions o n lnput Connections
*
Setting of input equipment
The input current of the FX-40DU-E is 7 mA, 24V DC.
It is therefore necessary to use input
equipment suitable for use with this extremely small current.
Examples: Made by Omron
Microswitches:
Z, V and D2RV models
Operation switches: A3P model
Proximity switches: TL and E2M models
Photoelectric switches: E3S and E3N models
Use of switches that use large currents may lead to contact faults.
7 mAI24V D C
The resistor in parallel Rp must have a resistance of at least
15KR.
If the resistance is less than this value, a bleeder resistor Rb,
having a resistance determined by the equation below, must
be connected between the [24+] and [IN] terminals.
The current leakage I ( from two-wire proximity switches
when they are switched OFF must be kept within 1.5 mA. If
the current leakage exceeds this value, a bleeder resistor
with a resistance determined by the equation below must be
connected between the [24+] and [IN] terminals.
By photo-coupler
Approx.
4 ms
8