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MELSEC-
A
5 PRELIMINARY INFORMATION
(b) Transmission area (
R2
14H to 17H,
R2
18H to 1BH)
This area is used to store the data transmitted to the external device from
the master station to the R2.
When using a reading dedicated device, such as a barcode reader, the
data does not need to be transmitted, so the transmission size (
R2
14H,
R2
18H) can be set to "0".
The default transmission size is 200
H, so the transmission side can be
reduced by setting it according to the No. of words being used.
1) Update timing (Update direction: Master station to R2)
The master station data is stored in the R2 buffer memory at the
following timing.
•
Just after the R2 detects that the transmission request signal
(RYn0) has turned from OFF to ON.
R2
External device such as ID controller
1) Transmission
request ON!
2) Transmission request
ON confirmed!
3) Transmission
data
Master station
Transmit after R2
detects transmis-
sion request ON!
3) Transmission
data
(c) Reception area (
R2
1CH to 1FH)
This area is used to store the data received by the R2 from an external
device to the master station.
When writing with an ID controller, etc., and there is no need to receive
data, the transmission size (
R2
1CH ) can be set to "0".
The default transmission size is 200
H, so the transmission side can be
reduced by setting it according to the No. of words being used.
1) Update timing (Update direction: R2 to Master station)
The master station data is stored in the R2 buffer memory at the
following timing.
•
Just before the R2 turns ON the reception normal read request
signal (RXn2)/reception error read request signal (RXn3).
R2
External device such
as ID controller or
barcode reader
2) Reception data
Master station
3) Reception normal (error)
read request ON!
Transmit just before reception
normal (error) read turns ON!
1) Reception data