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MELSEC-
A
7 USING FRAMES WHEN EXCHANGING DATA
1) Transmission/reception data corresponding to EEH to F3H
The user registration frame section corresponding to the special
character Nos. EE
H to F3H uses the range, excluding the head frame
of the transmission/reception data (statement), to transmit/receive the
calculated sum check code as binary/ASCII data.
•
Calculation range
The calculation target is the range from the data following the
user registration frame (1 head frame worth) at the head of the
transmission/reception data to just before the sum check code is
designated.
(Example) Arrangement of data for transmission/reception
02
H
S
T
X
02
H
10
H
D
L
E
10
H
41
H
A
31
H
1(12AB
H
)
AB
H
12
H
03
H
E
T
X
03 FF
H
32
H
01
H
F1
H
0D
H
C
R
0D
H
0A
H
L
F
0A
H
User registration frame
registration code
Transmission/reception
data corresponding to
registration code
Transmission/reception
data code
User registration
frame
(Head frame)
Random data
User registration
frame (End frame)
Sum
check
code
Sum check code
calculation ran
g
e
The programmable controller CPU
side is calculated by the R2.
•
Calculating the sum check code
This is the value obtained by adding the data in the above range as
binary data.
(In case of example)
(H)(L)
41H + 31H + ABH + 12H + 03H = 0132H
•
The details (arrangement) when transmitting/receiving the
corresponding sum check code if a registration code FF
H, EEH to
F3
H is contained in the user registration frame, is shown with the
statements used in the example.
Registration code
Contents during transmission/reception
(arrangement)
FFH, EEH Transmission/reception of 01H, 32H from 32H
FFH, F0H Transmission/reception of 32H
FFH, F1H Transmission/reception of "3", "2" from "3"
FFH, F3H Transmission/reception of "2"