D-51
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
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
3. PLC number
The PLC number is used to identify a PLC to be accessed when computer link is combined with the
MELSECNET (II) or MELSECNET/B in A Series PLCs. The PLC number of each FX Series PLC is fixed to
"FFH", and converted into two-digit ASCII code.
When the on-demand function is used, however, the PLC number is automatically changed to "FEH" by the
PLC.
For the PLC number of an A Series PLC used together with the MELSECNET (II) or MELSECNET/B, refer to
the respective A Series PLC manual.
4. Command
A command specifies the contents of access executed by the computer to a PLC.
A command is converted into a two-digit ASCII code.
For an explanation of commands, refer to Chapter 7.
5. Message waiting time
The message waiting time should be specified because some computers require more time before receiving
additional data. Set the waiting time according to the specifications of each computer.
Set the waiting time within the range from 0 to 150 ms in 10-ms
units
. 10 ms is handled as "1H", and a value
ranging from "0H (0)" to "FH (15)" is converted into a one-digit ASCII code.
When executing communication using the 485PC-IF in a 1-to-N system adopting the one-pair wiring, make
sure to set the message waiting time to 70 ms (7) or more. When the scan time of a PLC in the system
exceeds 70 ms, set the message waiting time to the maximum scan time or higher.
Example: When the message waiting time is set to 100 ms
PLC
Interval times
FX
3U
,
FX
3UC
300
s
FX
2N
,
FX
2NC
,
FX
3S
,
FX
3G
,
FX
3GC
100
s
FX
2
(FX), FX
2C
, FX
0N
, FX
1S
, FX
1N
, FX
1NC
two scan times
Computer side
PLC side
Sending is started 100 ms or later.
The waiting time should be the interval
times in the following table or more.
"A"
Message waiting time (100 ms)
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 ...
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