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• A1SJ71AR21
Product name
A1SJ71AR21 data link module
(3) The following table lists PLC CPUs applicable to the A1SJ71AP21/
AR21 and numbers of mountable modules.
Applicable PLC CPU
A1SCPU, A1SJCPU-S3, A2SCPU, A1SHCPU,
A1SJHCPU, A2SHCPU
A2ASCPU(S1), A2USHCPU-S1, Q2ASCPU(S1),
Q2ASHCPU(S1)
2. Specification
Item
Model
A1SJ71AP21
Max. number
Input (X)
of link points
used per
Output (Y)
station
Max.
B
number of
link points
W
MELSECNET
per system
Mode
Max. number
Y(points)+B(points)
of link points
per station
Max.
B
number of
link points
W
per system
MELSECNET
first half:
II Mode
Y(points)+B(points)
Max. number
of link points
per station
second half:
Max.
B
number of
link points
W
per system
MELSECNET
first half:
II Composite
Y(points)+B(points)
Mode
Max. number
of link points
per station
second half:
Internal current consumption
(5V DC)
Weight
No. of occupied I/O points
System's allowable
momentary power failure time
Communication speed
Communications method
Synchronous method
Transmission path method
Max. 10km
Overall loop distance
(1km (3281 ft)
station intervals)
Number of connectable
stations
Demodulation method
Transmission format
Error control system
The loopback function checks error detection and
RAS function
cable breakage.
The diagnostic function checks the self link line
2-core optical connector plug
Connector
SI optical fiber
Cable used
H-PCF optical
fiber cable
Transmission loss
Max. 12dB/km
-17 to -11 dBm
Sending level
(peak value)
-32 to -11 dBm
Receiving level
(peak value)
*1: Specialised skill and specific tools are required to connect the connector to the
opticalfiber cable; the connector itself is a custom product. Please contact your
nearest Mitsubishi Electric System & Service Corporation when purchasing these
products.
REMARK
1) The overall loop distance refers to the distance from
the master station sending port to the master station
receiving port via slave stations.
For both the fiber optic cables and coaxial cables,
The overall loop distance is a maximum of 10km
(32810ft.).
2) For general specifications of the date link system,
refer to the user's manual for the PLC CPU module
that is to be used.
Quantity
1
No. of Mountable Modules
1
2
Coaxial Cable
Fiber-Optic Cable Data Link
Data Link
A1SJ71AP21-S3
A1SJ71AR21
Up to the max. I/O points for the CPU used
1024points (128bytes)
1024points (2048bytes)
+ 2 W(points) 1024bytes
8
4096points (512bytes)
4096points (8192bytes)
+ 2 W(points) 1024bytes
8
B(points)
+ 2 W(points) 1024bytes
8
4096points (512bytes)
4096points (8192bytes)
+ 2 W(points) 1024bytes
8
B(points)
+ 2 W(points) 1024bytes
8
0.33A
0.30kg
32points
Within 20ms
1.25Mbps
Half-duplex bit serial
Frame synchronous
Duplex loop
Max. 10km
Max. 10km
(32810ft)
(32810ft)
(2km (6562ft)
(500m (1640.5ft)
station intervals)
station intervals)
Max. 65 stations/loop (1 master station, 64
local/remote I/O stations)
CMI
Conforms to HDLC (frame method)
Retry due to CRC (generating polynomial X
12
5
+ X
+ X
+ 1) and time over
*1
(Arranged by user
)
cable
GI optical fiber
3C-2V, 5C-2V
cable
equivalent
Max. 3dB/km
-17 to -10 dBm
(peak value)
-29 to -10 dBm
(peak value)
M
L6
R5
R4
Overall distance
3. Names and Settings of Each Part
No. Name
1) LED
2) Station number setting
switches
0.80A
0.33kg
3) Mode setting switch
(32810ft)
16
4)
Connector
---
Forward loop
Reverse loop
receiving
---
5)
Connector
---
---
OUT R-RD
Reverse loop
receiving
Forward loop
POIN
L1
For details on the settings and the operating method in test mode, refer to the type
R2
MELSECNET, MELSECNET/B Data Link System Reference Manual.
L3
A1SJ71AP21(-S3)
1)
2)
3)
4)
Description
RUN
ON when data link is normal
SD
ON during data transmission
RD
ON during data reception
F.LOOP • ON while data are received from the
forward loop side
• OFF while data are received from the
reverse loop side
CPU
ON during communication with PLC CPU
CRC
ON during code check of received data
OVER
ON indicating an error when receive data
processing is delayed
AB.IF
ON indicating an error when too many
consecutive 1s are received or when the
length of received data is too short
TIME
ON indicating an error when the data link
monitoring timer is activated
DATA
ON indicating an error when erroneous data
of 2k bytes or more are received
UNDER ON indicating an error when the internal
processing of send data is not done at the
fixed intervals
F.LOOP Turns ON by a reception error on the forward
loop side
R.LOOP Turns ON by a reception error on the reverse
loop side
Set a station number within a range from 00 to 64.
(factory set: 00)
• master station
local station
X10
STATION
X10
NO.
X1
X1
Select a mode from the following. (factory set: 00)
No.
Mode
0
On-line
MODE
1
On-line
2
Off-line
3
Forward
0:ONLINE(A.R.)
1:ONLINE(U.R.)
loop test
2:OFFLINE
3:TEST 1(F.L.)
4
Reverse
4:TEST 2(R.L.)
5:TEST 3(B.M.)
loop test
6:TEST 4(B.S.)
7:TEST 5(S.R.)
5,6 Station-to-
station test
7
Self-
loopback
test
8 to F
---
For A1SJ71AP21(-S3)
Optical fiber cable connector
OUT
IN
Reverse loop
sending
sending
Forward loop
receiving
For A1SJ71AR21
Coaxial cable connector
IN R-SD
Reverse loop
sending
OUT F-SD
IN F-RD
Forward loop
sending
receiving
T
A1SJ71AR21
1)
2)
3)
5)
00
01 to 64
Set a tens digit.
Set a units digit.
Description
Data link with automatic return
Data link without automatic return
Puts this station into cut-off status.
Checks the forward loop in the
entire data link system.
Checks the reverse loop in the
entire data link system.
Checks a line between 2 adjacent
stations.
Checks hardware of the data link
module, including sending/
receiving circuits in the
communication system.
Use prohibited
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