User`s manual

6-7
(5) Note for external wiring to I/O module
1. Relay output module: JW-204SA, JW-214SA
Since the relay output module does not have a built-in surge absorbing circuit, do not forget to
install a surge killer, such as a varistor, in the output side. Operation without a surge killer might
give bad effects on other modules by spark noises from the relay. As for the surge killer, see
page 7-16 "Precautions for operating I/O module."
2. DC input module: JW-234N, JW-212NA/214NA
When extending the external line of the DC input module for more than 100 m, use shielding
wire. Even in case of less than 100 m extension, shielding wires should be used under certain
conditions. Do not forget to connect the shield of the shielding wire with the ground of the
JW300.
3. AC input module: JW-203N, JW-211NA
Do not use the outputs from a constant voltage transformer and an AC regulator, for the AC
power supply to the AC input module. When the constant voltage transformer and the AC
regulator are used, the module signal could be turned ON even with an input voltage less than
the rate voltage due to a high distortion rate (10 to 50%) of alternative current waves.
The power supply to the AC input module should have a distortion rate of less than 5%.
PLC
Common
Ground
Input
PLC
Common
Input
Switch
AC input
Constant voltage
transformer