Slave Station Forced Clear Function At Safety Cpu Stop - Mitsubishi Electric MELSEC QS Series User Manual

4
FUNCTIONS

4.2.10 Slave station forced clear function at safety CPU stop

This function forcibly clears the remote output (RY) to slave stations when the safety CPU
module is stopped.
The following is applied depending on the remote output (RY) refresh device setting of the
automatic refresh parameter.
The figure below shows the target buffer memory areas.
Safety CPU module
Remote input (RX)
Station No.1
Station No.2
Remote output (RY)
Station No.1
Station No.2
Remote register
(RWw)
Station No.1
Station No.2
Remote register
(RWr)
Station No.1
Station No.2
The forced clear of slave stations in case of safety CPU stop works on the remote output
(RY). It does not function on remote input (RX), remote register (RWw) and remote
register (RWr).
POINT
• When "Y" is specified, the remote output (RY) turns off regardless of the
parameter setting.
• When "any other than Y (e.g. M)" is specified, whether to clear the remote output
(RY) forcibly or not can be selected with a parameter. (The parameter setting is
effective only when the safety CPU is in TEST mode. In SAFETY mode or in the
wait-for-restart-SAFETY state, the remote output (RY) is forcibly cleared
regardless of the parameter setting.)
Safety master station
Remote input (RX)
Station No.1
Station No.2
Forced clear Remote output (RY)
0 Station No.1
0 Station No.2
Remote register
(RWw)
Station No.1
Station No.2
Remote register
(RWr)
Station No.1
Station No.2
Specifying the forced clear disables the forced output to slave stations by GX
Developer when the safety CPU module stops.
4.2 Detailed Explanation of Functions
4.2.10 Slave station forced clear function at safety CPU stop
Remote I/O station Remote device station
(Station No.1) (Station No.2)
Input
Remote input (RX)
Output
Remote output (RY)
Remote register
Remote register
Area that is forcibly cleared
(RWw)
(RWr)
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