General Precautions When Wiring the Input/Output Signal Wires
WARNING
• To prevent the possibility of electric shock when wiring, confirm that the power
supply source and signal source are turned OFF. After making the connections,
secure the terminal cover and do not touch the terminals with your hands.
• For signal wires on which voltage exceeding 30 VAC/60 VDC is applied relative
to the ground potential or between signals, use reinforced (double) insulation
wires. For all other signal wires, use basic insulation wires. For the withstand
voltage of insulation wires, see the table below.
Applied Voltage (Vrms or VDC) Basic Insulation Double (Reinforced) Insulation
30(60 VDC)-100 620 V rms 1000 V rms
101-150 840 V rms 1400 V rms
151-300 1390 V rms 2300 V rms
301-600 2210 V rms 3700 V rms
• To avoid electric shock when removing the terminal block and terminal plate for
wiring, be sure to attach the terminal block and terminal plate to the input/output
module before inputting or outputting signals. Electric shock or fire can result if
signals are applied to the terminals when the terminal block is removed from the
input/output modules.
• When wiring to the screw terminal block, use round insulation-coated crimp-on
lugs (for 4 mm screws) for the terminals. Also, to prevent fire, use signal wires
of the following temperature rating or better.
Module Type Temp. Rating
Screw terminal 75°
C
Analog output module, PWM output module signal wires 85°C
Universal input modules, digital input modules, 80°C
digital output modules,
four-wire RTD resistance input modules,
and strain input modules
CAUTION
• If a large pulling force is applied to the input/output signal wires connected to the
MX100, the terminal or signal wire may break. To prevent this from happening,
fix all the wiring cables to the installation panel.
• Wiring of the Strain Input Module (-NDI)
When connecting a bridge head, in order that the empty weight of the cable
does not exceed 5 kg, ensure that the cable does not hang down more than 1.5
m (the distance to the floor). If it does, secure the cable to the installation panel
or some other location.
• Do not apply a voltage exceeding the value indicated below to the input
terminals of the universal input modules. Doing so can damage the modules.
• Maximum input voltage
Voltage range less than or equal to 1 VDC, TC, RTD, and DI:
±10 VDC Other
voltage ranges: ±120 VDC
• Maximum common mode voltage: 600 VACrms (50/60 Hz)
2.4 Connecting the Signal Wires
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