D-41
FX Series PLC User's Manual - Data Communication Edition
Computer Link
6 Control Procedures and Setting Methods
6.4 Basic Formats of Dedicated Protocol
A
Common Items
B
N:N Network
C
Parallel Link
D
Computer Link
E
Inverter
Communication
F
Non-Protocol
Communication
(RS/RS2 Instruction)
G
Non-Protocol
Communication
(FX
2N
-232IF)
H
Programming
Communication
I
Remote
Maintenance
Apx.
Discontinued
models
6.4.2 Control procedure format 4
The table below shows the control procedure for format 4.
Description Control procedure (protocol)
When
computer
reads data
from PLC
When
computer
writes data to
PLC
Remarks
1) The sum check code is added only when "sum check code provided" is selected.
The sum check code is not added when "sum check code not provided" is selected.
2) When "sum check code provided" is selected, the sum check is executed only to the character
areas marked with "*" in the figure above.
3) The contents of "Character area A", "Character area B" and "Character area C" vary depending
on the contents of transfer, but do not vary depending on the control procedure format.
→ For details on character contents, refer to "7. Commands".
Computer side
PLC side
E
N
Q
S
T
X
E
T
X
or
or
*
*
N
A
K
N
A
K
A
C
K
L
F
C
R
L
F
C
R
L
F
C
R
L
F
C
R
L
F
C
R
Transfer order
Station
No.
PLC No.
Command
Message
wait time
Character
area A
Sum check
code
Character
area B
Sum check
code
Station
No.
PLC No.
Error
code
Station
No.
PLC No.
Station
No.
PLC No.
Station
No.
PLC No.
Computer side
PLC side
E
N
Q
A
C
K
or
*
N
A
K
L
F
C
R
L
F
C
R
L
F
C
R
Transfer order
Station
No.
PLC No.
Command
Message
wait time
Character
area C
Sum check
code
Error
code
Station
No.
PLC No.
Station
No.
PLC No.
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