D-71
FX Series PLC User's Manual - Data Communication Edition
Computer Link
7 Commands
7.13 On-demand Function
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
2) Control procedure in the computer
3) Time chart when the on-demand function is requested
While the computer is sending data
[1] As soon as an on-demand request is given, the on-demand send processing signal M8127 turns ON.
[2] After receiving of command data (ENQ ~) from the computer is completed, the PLC sends on-demand
data.
[3] After the sending of on-demand data is complete, the PLC sends response data (STX ~) to the
command data (ENQ ~).
While the computer is receiving data
[1] As soon as an on-demand request is given, the on-demand send processing signal M8127 turns ON.
[2] After the sending of response data (STX ~) to the command data (ENQ ~) from the computer is
completed, the PLC sends on-demand data.
[3] After the receiving of on-demand data is complete, the computer sends response data (ACK ~) to the
sending of the response data (STX ~) from the PLC.
Judges whether receive data is
on-demand data or data given
by command execution.
Receiving of on-demand data
Data processing
Completion of receiving
To the on-demand data, the PLC adds "FE" as the PLC
number. Only when the PLC number of the received data is
"FE", the received data should be processed as on-demand
data.
........
E
N
Q
S
T
X
A
C
K
On-demand send processing
M8127
Writes data to be sent and
amount of data to be sent.
[2] On-demand data
[1]
[3]
PLC
Computer side
PLC side
Writes data to be sent and
amount of data to be sent.
E
N
Q
S
T
X
A
C
K
On-demand data
[1]
[3]
[2]
On-demand send processing
M8127
PLC
Computer side
PLC side
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