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5. Communication Between the Master Station and ME96NSR
5.1 Communication Guideline
There are three communication statuses (Initial Communication, Normal Communication, Error
Communication) between the Master station and ME96NSR.
The following can be performed at normal communication.
・ Monitoring of the measurement values such as the current, voltage and energy, etc.
・ Monitoring of the bit data of the alarm state and the digital input state.
・ Setting the set data of the time constant for current demand.
ME96NSR has a special-purpose command for each measurement items and each setting items. It
becomes possible to monitor measurement value or to set the setting value by writing the command into
the remote register RWw of the master station.
Overview of the Command Communication to ME96NSR
Master station
Command/Data
Remote register(RWw)
①
Bit device(Ex:Y)
Command
③
Command
Automatic refresh
Bit device(Ex:X)
Command/Data
Remote output(RY)
Command
execution request
execution request
⑥
Remote register (RWw)
②
Remote input(RX)
Command
execution request
Remote input(RX)
⑤
Command
Command/Data
Remote output(RY)
④
Link scan
Word device(Ex:W)
ME96NSR
Command
execute
PLC CPU
Command
completion reply
completion reply
completion reply
Word device(Ex:W)
Remote register(RWr)
Remote register(RWr)
Reply data to
command
①
②
③
④
⑤
⑥
⑦
⑧
⑧
Reply data to
command
⑦
Reply data to
command
By automatic refresh, command and data stored in the word device of PLC CPU are stored in the “remote
register RWw” of the master station.
By link scan, command and data stored in the “remote register RWw” of the master station are sent to
ME96NSR, and is stored in the “remote register RWw” of the ME96NSR.
By automatic refresh, command execution request stored in the bit device of PLC CPU is stored in the “remote
output RY” of the master station.
By link scan, command execution request stored in the “remote output RY” of the master station is sent to
ME96NSR, and is stored in the “remote output RY” of the ME96NSR. And then ME96NSR executes the
command and data.
By link scan, command completion reply stored in the “remote input RX” of the ME96NSR is sent to the master
station, and is stored in the “remote input RX” of the master station.
By automatic refresh, command completion reply stored in the “remote input RX” of the master station is stored
in the bit device of the PLC CPU.
By link scan, reply data to command stored in the “remote register RWr” of the ME96NSR is sent to the master
station, and is stored in the “remote register RWr” of the master station.
By automatic refresh, reply data to command stored in the “remote register RWr” of the master station is stored
in the word device of the PLC CPU.
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