User`s manual

3-19
3-4 Precautions for system design
If an error occurs in the PLC, the whole system will report a fault.
In order to create a fail-safe system, we recommend preparing independent external protective circuits
for following functions, which may cause a breakdown of machine or injury to workers:
• Emergency stop circuit,
• Protection circuit,
• Operating circuit of high voltage device.
Also, be aware of the operation response time, as a PLC operates using cyclic processing.
To prevent mis-operation due to output signal of the output module soon after switching on power to the
JW300, connect in series the halt output for the JW300 in the following operation stand-by circuit.
(1) In case of using AC power supply
- Connecting the input module and output
module for lighting lamps in front of
emergency stop circuit makes it possible
to grasp the stop condition of devices.
- When the JW300 stops its operation, all
the output module indicate ON/OFF
condition just before stopping.
Note: When setting an output holding
address in the system memory,
all the output after the setting
address is retained and you can
reset the previously set address.
(only available when power is
supplied to the JW300.)
- Halt output
JW-301PU Relay output: 100/200 VAC,
30 VDC, 1A
JW-31PU Relay output: 100 VAC, 30
VDC, 1A
- Interlock circuit
Prepare external interlock circuit to
prevent reverse operation, damage of
machines and injury of workers.
Note: When DC output module is used
as a output module, use AC relay
and install its contact in the
emergency stop circuit.
85 to 264 VAC (JW-301PU)
85 to 132 VAC (JW-31PU)
85 to 264 VAC (JW-301PU)
85 to 132 VAC (JW-31PU)
JW300
JW300
halt output
MC
MC
MS1
MS2
MS1
MS2
Input module
Output module
Emergency
stop
Operation
preparation
Output module
Thermal
switch