Toshiba V Series User Manual page 146

Chapter 3 Precautions for I/O Modules
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(3) If external lines for AC input become longer with using a multi-core cable, induced
current may flow to a open wire from charges wires due to the electrostatic capacity
of the cable, causing an erroneous ON input. In this case, install a bleeder resistor
between the input terminals to lower the input impedance. Or, you had better apply
the DC input.
(4) If the AC lines are installed in parallel with high frequency or power lines, induced
current may cause erroneous input. In this case, take necessary countermeasures
as follows.
• Change the installation route of AC input lines so that they are not parallel with
power lines and high frequency lines.
• Use twisted-pair cables as input lines.
• Use shielded cables as input lines.
• Use relays at the leading in the control panel (the relay must satisfy larger ON
current).
• Install a bleeder resistor to lower the input impedance.
(5) If the input module and an inductive load are connected in parallel, a surge voltage
generated at both-ends of the load when the contact is changed to OFF may cause
a malfunction of the model 2000. In the case, install a surge absorption element in
parallel with the load to suppress the surge voltage.
∼
Inductive load
L
Surge absorption element (snubber circuit, etc.)
model 2000 Sequence Controller S2 User's Manual -Basic Hardware-
Input module