Continuous Setting/Continuous Monitoring; Access By Request Command - Mitsubishi Electric LE7-40GU Instruction Manual

Continuous setting/continuous monitoring

Data specified in advance can be set and monitored continuously by setting the continuous setting execution (RY2E) and
continuous monitor execution (RY2E) in the master station to ON.
For continuous setting data, the data set for RAM writing is not stored during a power failure.
The latest data existing in LE7-40GU when the master station gives the send request can be monitored continuously.
However, regarding the update of parameters for which the monitor update cycle is specified by the setting in LE7-40GU, the
data is updated in the specified update cycle if the specified update cycle is longer than the monitor update cycle in the send
request given by the master station.
Continuous settings
1.
Data write to devices with continuous settings 1 to 16
2.
Turn on continuous settings execution
Continuous monitor
1.
Turn on continuous monitor execution
2.
Read the data of the devices of continuous monitors 1 to 16

Access by request command

For any access to data in LE7-40GU from the master station, data can be read and written by handshake between the
"request command execution (RY2F)" flag and the "request command completion (RX2F)" flag.
This access is performed using a 2-word word device of the master station.
This 2-word data is comprised of the request command, to which the upper 4 bits of the first word are assigned, and the
request code, to which the lower 2 bits are assigned, and the setting data, to which the next word is assigned.
bit 15 to 12
Request command
Setting data
There are three types of request command, Data Monitor, Writing to RAM, and Writing to RAM + ROM, according to the
selection of data reading and writing method.
Monitor
Writing data is reflected in the settings based on a
data read request from the master station but is
not stored in the case of a power failure.
In the ROM for storage against power interruption, the allowable number of times of writing is limited. Accordingly, data
cyclically written and updated by the PLC must be written only to the RAM.
Request command
H0
H1
H2
The request code is the data number (address) of the data that executes the request command. The subsequent data setting
is the data to be written to the data number, and if the request command is the monitor, the data setting data is ignored.
When double word data is written to send data in the master station, and the handshake is executed by turning ON/OFF the
request command execution flag and request command completion flag as follows, LE-70GU sends back the request
command execution request.
1.
The master station is set to request command execution ON.
2.
LE7-40GU executes processing when receiving turning ON of the request command execution by the master station.
3.
LE7-40GU turns ON the request command completion.
4.
The master station receives the request command completion ON.
5.
The master station is set to request command execution OFF.
bit 11 to 0
Request code
Writing to RAM
Writing data is reflected in the settings based on a
data write request from the master station but is
not stored in the case of a power failure.
Contents of execution
Monitor
Writing to RAM
Writing to RAM + ROM
3 CC-LINK IE FIELD NETWORK BASIC COMMUNICATION
Writing to RAM + ROM
Perform the above RAM write + data power failure
write.
Execution result
Monitored value
Writing result
Writing result
3.2 Communication Setting
3
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