Mitsubishi Electric MELSEC iQ-F Series, User Manual

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6 WIRING
6.5 Input Wiring
93
6
Precautions for connecting input devices
■
In the case of no-voltage contact
Use input devices appropriate for low electric current.
If no-voltage contacts for high current (switches) are used, contact failure may occur.
■ In the case of input device with built-in series diode
The voltage drop of the series diode should be the following value or less.
Also make sure that the input current is over the input-sensing level while the switches are on.
■
In the case of input device with built-in parallel resistance
Use a device having a parallel resistance Rp (k Ω ) of the following value or more.
If the resistance is less than the above parallel resistance Rp (k
Ω
), connect a bleeder resistance Rb (k
Ω
) obtained by the
following formula as shown in the following figure.
Item Specifications
Voltage drop CPU module X0, X1, X3, X4 3.9 V
X2, X5, X6, X7 4.1 V
X10 and subsequent 2.4 V
Input module, Input/output modules, Powered input/output module
Item Specifications
Parallel resistance Rp (k Ω ) CPU module X0, X1, X3, X4 14
X2, X5, X6, X7 15
X10 and subsequent 13
Input module, Input/output modules, Powered input/output module
Item Specifications
Bleeder resistance Rb (k Ω ) CPU module X0, X1, X3, X4 5 Rp / (14-Rp) or less
X2, X5, X6, X7 4 Rp / (15-Rp) or less
X10 and subsequent 6 Rp / (13-Rp) or less
Input module, Input/output modules, Powered input/output module
X
24V
Rp
Rb
X
0V
Rp
Rb
24V
S/S S/S
0V
PLC
(sink input)
PLC
(source input)
Bleeder
resistance
Bleeder
resistance