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4 FUNCTIONS
MELSEC-QnA
[Data link startup]
1
Turn on the refresh instruction (Yn0) and make the remote output (RY) data valid.
When the refresh instruction (Yn0) is off, all the remote output (RY) data is treated
as 0 (off).
2
Turn on the data link startup by the E
2
PROM parameters (Yn8) and start the data
link.
However, the parameters must be set in the E
2
PROM beforehand.
When the data link is started normally, the host data link status (Xn1) turns on.
POINT
The data link can also be started from the parameters written in the "parameter data area" in
the buffer memory. (Refer to chapter 6.)
[On/off data from local station
master and other local stations]
3
With the TO instruction, write the on/off data to be sent to the master and other local
stations to the local station's "remote output (RY)" in the buffer memory.
4
The data in local station's "remote output (RY)" in the buffer memory is
automatically (for each link scan) stored in the master station's "remote input (RX)"
in the buffer memory and other local station's "remote output (RY)" in the buffer
memory.
5
The input status stored in the "remote input (RX)" in the buffer memory is received
to the programmable controller CPU with the FROM instruction.
6
The input status stored in the "remote output (RY)" in the buffer memory is received
to the programmable controller CPU with the FROM instruction.
FROM
RX0F to RX00
RX1D to RX10
RX2F to RX20
RX3F to RX30
RX4F to RX40
RX5F to RX50
RX6F to RX60
RX7F to RX70
RX8F to RX80
RX9D to RX90
RXAF to RXA0
to
RX7FF to RX7F0
RY0F to RY00
RY1D to RY10
RY2F to RY20
RY3F to RY30
RY4F to RY40
RY5F to RY50
RY6F to RY60
RY7F to RY70
RY8F to RY80
RY9D to RY90
RYAF to RYA0
to
RY7FF to RY7F0
Programmable controller
CPU
Master station
Remote input (RX) Remote output (RY)
Remote output (RY)
RY0F to RY00
RY1D to RY10
RY2F to RY20
RY3F to RY30
RY4F to RY40
RY5F to RY50
RY6F to RY60
RY7F to RY70
RY8F to RY80
RY9D to RY90
RYAF to RYA0
to
RY7FF to RY7F0
...The last 2 bits cannot be used when the master station and the local station are communicating.
Local station
(station No. 1:
occupies 1 station)
Local station
(station No. 2:
occupies 4 stations)