Toshiba SX 2000 User Manual
Page 133
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Chapt.3 Precautions for I/O Modules
(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 S2T. In the case, install a surge
absorption element in parallel with the load to suppress the surge voltage.
Input module
Surge absorption element (snubber circuit, etc.)
1 1 6
Sequence Controller S2T