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MELSEC-
A
7 USING FRAMES WHEN EXCHANGING DATA
3) Details of RX/RY/RW reference special characters
Special character
code
Details
C0H
During frame transmission, the ON/OFF state of the remote input (RX)/remote output (RY) is
referred. Depending on whether the designated RX/RY is ON or OFF, the designated registration
frame's registration data is transmitted.
FF
H
C0
H
RX/RY designation
Registration frame No. at ON Registration frame No. at OFF
*
1
(Example) To transmit designated data with RX1 ON/OFF
At RX1 ON : Transmit registration frame No. 3E8
H registration data
At RX1 OFF : Transmit registration frame No. 3E9
H registration data
FF
H
C0
H
0101 3E8
H
3E9
H
C1H
During frame transmission, the remote register (RW) value is referred to, and the designated
registration frame registration data is transmitted according to the results of the comparison with
the designated value. If the RW value referred to is 8000
H, the contents of the transmission area
are transmitted.
FF
H
C1
H
RW
designation
Compari-
son value
Registration frame No.
(RW = comparison value)
Registration frame No.
(RW > comparison value)
Registration frame No.
(RW < comparison value)
*
1
(Example) To refer to the RW123 value, and transmit the designated registration frame data at
the following conditions.
When RW = comparison value: Transmit registration frame No. 3E8
H registration
data
When RW
>
comparison value: Transmit registration frame No. 3E9H registration
data
When RW
<
comparison value: Transmit registration frame No. 3EAH registration
data
FF
H
C1
H
123
H
3E8
H
53E9
H
3EA
H
C2H to CFH Use prohibited
D0H
During frame transmission, the remote register (RW) value is referred to, and depending on the
value, the registration frame registration data or the contents of the transmission area are
transmitted. The designated RW value is interpreted as the registration frame No. If the RW value
is 8000
H, the contents of the transmission are transmitted.
FF
H
D0
H
RW
designation
*
1
(Example) When RW value referred to is 102H
LF
0A
H
CR
0D
H
Transmission
Registration frame No. 102
H
data
D1H to D7H Use prohibited
D8H
During frame transmission, the remote register (RW) value is referred to. The value is interpreted
as an unsigned value (0 to 65535), is converted into a 5-digit decimal ASCII code, and is then
transmitted.
If the RW value referred to has less than 4 digits, the data will be converted into a "space string" +
value ASCII code and transmitted.
FF
H
D8
H
RW
designation
*
1
(Example) When designated RW value is 1234
4
34
H
3
33
H
2
32
H
20
H
1
31
H
"1234" is transmitted as ASCII code
Transmission
*1 Refer to section 2) for details on designating RX/RY/RW.