Mitsubishi Electronics AJ61BT11 Benutzerhandbuch
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2 SYSTEM CONFIGURATION
MELSEC-QnA
2.2.2 Precautions when configuring a system
Design the system with the following considerations to prevent mis-input from the
remote I/O module:
remote I/O module:
(1) During power on and power off
Start the data link after turning on the power for the remote I/O module.
Turn off power for the remote I/O module after stopping the data link.
Turn off power for the remote I/O module after stopping the data link.
During stop
During
operation
operation
ON
OFF
Master module
(Data-link status)
(Data-link status)
Remote I/O module
(Power supply status)
(Power supply status)
Data link start
Data link stop
(2) During momentary power failure of the remote I/O module
When momentary power failure occurs with the power (24VDC) supplied to the
remote I/O module, mis-input may occur.
remote I/O module, mis-input may occur.
(a) Cause for mis-input due to a momentary power failure
The remote I/O module hardware uses the power after internally converting
the module power (24VDC) in to 5VDC.
When momentary power failure occurs with the remote I/O module, the
following condition occurs:
(Time for the 5VDC in the internal remote I/O module to turn off) > (input
module on off response time)
Therefore, mis-input is caused when a refresh is performed within the time
indicated by
the module power (24VDC) in to 5VDC.
When momentary power failure occurs with the remote I/O module, the
following condition occurs:
(Time for the 5VDC in the internal remote I/O module to turn off) > (input
module on off response time)
Therefore, mis-input is caused when a refresh is performed within the time
indicated by
1
) in the diagram below.
Remote I/O module
(Module power supply
and input external-power
supply)
(Module power supply
and input external-power
supply)
Remote I/O module
(Internal 5VDC)
(Internal 5VDC)
Input (Xn)
Because the input external-power supply is turned off,
the input (Xn) turns off after the response time of input
module is turned off.
the input (Xn) turns off after the response time of input
module is turned off.
1