D-85
FX Series PLC User's Manual - Data Communication Edition
Computer Link
9 Related Data
9.2 Details of Related Devices
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
• Contents of D8420
2. Cautions on use
Do not use both the parameters and communication format setting devices (D8120 or D8420) at the same
time. If the communication format is set using both methods at the same time, priority is given to the setting
using parameters.
When setting the communication format device (D8120) in an FX
0N PLC, set the communication setting
latched (battery backed) device (M8120) to ON.
When using computer link, make sure to set the header (b8) and terminator (b9) to "not provided". And set the
protocol (b14) to "used".
If the communication format is set using the special data register, the setting becomes valid when the power
is turned ON after the setting is written to the special data register.
9.2.10 Station number settings [D8121 and D8421]
These devices set the station number in computer link.
1. Detailed contents
Set the station number of each PLC used in computer link. The applicable setting range is from 0 to 15 (from
H00 to H0F).
In FX
1S
, FX1N, FX2N, FX3U, FX1NC, FX2NC and FX3UC PLCs, the contents set using parameters are stored
when the power is turned ON.
In FX
0N, FX2(FX), and FX2C PLCs, set the station number using a sequence program, and then turn ON the
power.
In all PLCs except FX
3U and FX3UC PLCs and in FX3U and FX3UC PLCs using communication port ch1, use
D8121.
Set the station number using parameters when using the communication port ch2 in FX
3U and FX3UC PLCs.
Use D8421 for confirmation.
2. Cautions on use
Do not use both the parameters and station number settings device (D8121 or D8421) at the same time. If the
station number is set using both methods at the same time, priority is given to the setting using a parameter.
When setting the station number settings device (D8121) in an FX
0N PLC, set the communication setting
latched (battery backed) device (M8120) to ON.
Bit No. Name
Contents
0 (bit = OFF) 1 (bit = ON)
b0 Data length 7-bit 8-bit
b1
b2
Parity
b2, b1
(0, 0): Not provided
(0, 1): Odd
(1, 1): Even
b3 Stop bit 1-bit 2-bit
b4
b5
b6
b7
Baud rate
(bps)
b7, b6, b5, b4 b7, b6, b5, b4
(0, 0, 1, 1): 300 (0, 1, 1, 1): 4800
(0, 1, 0, 0): 600 (1, 0, 0, 0): 9600
(0, 1, 0, 1): 1200 (1, 0, 0, 1): 19200
(0, 1, 1, 0): 2400
b8 Header Not provided Provided
b9 Terminator Not provided Provided
b10
b11
b12
Control line
Com-
puter
link
b12, b11, b10
(0, 0, 0): RS-485/RS-422 interface
(0, 1, 0): RS-232C interface
b13 Sum check Not added Added
b14 Protocol Not used Used
b15
Control
procedure
Format 1 Format 4
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