D-81
FX Series PLC User's Manual - Data Communication Edition
Computer Link
7 Commands
7.13 On-demand Function
A
Comm
on I
te
ms
B
N:
N N
etwo
rk
C
Paral
le
l Li
nk
D
Com
puter Li
nk
E
In
verter
C
omm
uni
cation
F
N
on-Proto
col
C
ommunicati
on
(R
S/RS
2 Instru
ction
)
G
No
n-
Protoc
ol
Co
mmuni
ca
tion
(FX
2N
-2
32IF)
H
Programm
ing
Comm
uni
cation
I
Re
mo
te
Ma
intenance
Apx.A
D
isco
nti
nued
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
Summary of Contents for FX-485ADP
Page 2: ......
Page 120: ...B 2 FX Series PLC User s Manual Data Communication Edition N N Network ...
Page 188: ...C 2 FX Series PLC User s Manual Data Communication Edition Parallel Link ...
Page 244: ...D 2 FX Series PLC User s Manual Data Communication Edition Computer Link ...
Page 344: ...E 2 FX Series PLC User s Manual Data Communication Edition Inverter Communication ...
Page 700: ...H 2 FX Series PLC User s Manual Data Communication Edition Programming Communication ...
Page 752: ...I 2 FX Series PLC User s Manual Data Communication Edition Remote Maintenance ...
Page 817: ......