 Please design protection circuit at the external of Contrller for entire system to operate safely because
an abnormal output or a malfunction may cause accident when any error of external power or malfunction
of Controller.
(1) It should be installed at the external side of Controller to emergency stop circuit, protection circuit,
interlock circuit of opposition action such as forward /reverse operation and interlock circuit for
protecting machine damage such as upper/lower limit of positioning.
(2) If Controller detects the following error, all operation stops and all output is off.
(Available to hold output according to parameter setting)
(a) When over current protection equipment or over voltage protection operates
(b) When self diagnosis function error such as WDT error in Controller occurs
 When error about IO control part that is not detected by Controller, all output is off.
Design Fail Safe circuit at the external of Controller for machine to operate safely. Refer to 4.1.1 Fail
Safe circuit.
(1) Because of error of output device, Relay, TR, etc., output may not be normal. About output signal that
may cause the heavy accident, design supervisory circuit to external.
When load current is more than rating or over current by load short flows continuously, danger of heat,
fire may occur so design safety circuit to external such as fuse.
Design for external power supply to be done first after Controller power supply is done. If external power
supply is done first, it may cause accident by misoutput, misoperation.
In case communication error occurs, for operation status of each station, refer to each communication
manual.
In case of controlling the Controller while peripheral is connected to Controller, configure the interlock
circuit for system to operate safely. During operation, in case of executing program change, operation
status change, familiarize the manual and check the safety status. Especially, in case of controlling long
distance Controller, user may not response to error of Controller promptly because of communication
error or etc.
Limit how to take action in case of data communication error between Controller and external device
adding installing interlock circuit at the Controller program.
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