This chapter describes the performance specifications of the MELSECNET or MELSECNET/B data link system and the local module.
For the general specifications, refer to the QCPU User's Manual (Hardware Design, Maintenance and Inspection).
(1) Performance specifications of MELSECNET data link system and A1SJ71AP23Q
Table 2.1 Performance specifications of MELSECNET data link system and A1SJ71AP23Q
Item
Specifications MELSECNET data link system MELSECNET
mode MELSECNET II
mode MELSECNET II
composite mode Maximum
applicable link points per station
Input (X) Up to the maximum number of I/O points for the CPU module used in the master station is applicable.
(The total number of link points for slave station is equal to the number of link using points for the master station)
Output (Y)
Maximum link points in a system
B 1024 points
(128 byte) 4096 points (512 byte)
W 1024 points
(2048 byte) 4096 points (8192 byte)
Maximum link points per station
Master
station 1024 byte 1024 byte (First half of link parameters) 1024 byte (Latter half of link parameters) Local station
Remote I/O station
512 byte Number of I/O points: 512 points
-512 byte Number of I/O points: 512 points Communication speed 1.25Mbps
Communication method Half duplex bit serial method Synchronization method Frame synchronization method Transmission path Duplex loop
Overall cable distance Up to 10km (Station-to-station 1km) Number of connected
stations
Up to 65 (Master station: 1, The total number of local stations and remote I/O stations: 64)
Modulation method CMI method
Transmission format Conforming to HDLC (Frame format)
Error control system Retries due to CRC (generating polynomial X16+X12+X5+1) and time out
RAS function
• Loopback function due to error detection and cable break
• Diagnostic function including link line check of host station etc.
Connector 2-core optical connector plug (User prepared*1) Applicable cable Optical fiber cable (User prepared*1) Number of I/O occupied
points 32 points (Intelli: 32 points)
*1 Connecting an optical fiber cable with a connector requires professional skills and special tools. Also, a connector dedicated to an optical fiber cable is required.
For purchase, contact your local Mitsubishi Electric System Service or representative.
Internal current consumption
(5VDC) 0.33A
Weight 0.30kg
Table 2.1 Performance specifications of MELSECNET data link system and A1SJ71AP23Q(Continued)
Item
Specifications MELSECNET data link system MELSECNET
mode
MELSECNET II mode
MELSECNET II composite mode
(2) Performance specifications of MELSECNET data link system and A1SJ71AR23Q
Table 2.2 Performance specifications of MELSECNET data link system and A1SJ71AR23Q
Item
Specifications MELSECNET data link system MELSECNET
mode MELSECNET II
mode MELSECNET II
composite mode Maximum
applicable link points per station
Input (X) Up to the maximum number of I/O points for the CPU module used in the master station is applicable.
(The total number of link points for slave station is equal to the number of link using points for the master station)
Output (Y)
Maximum link points in a system
B 1024 points
(128 byte) 4096 points (512 byte)
W 1024 points
(2048 byte) 4096 points (8192 byte)
Maximum link points per station
Master
station 1024 byte 1024 byte (First half of link parameters) 1024 byte (Latter half of link parameters) Local station
Remote I/O station
512 byte Number of I/O points: 512 points
-512 byte Number of I/O points: 512 points Communication speed 1.25Mbps
Communication method Half duplex bit serial method Synchronization method Frame synchronization method Transmission path Duplex loop
Overall cable distance Up to 10km (Station-to-station 500m) Number of connected
stations
Up to 65 (Master station: 1, The total number of local stations and remote I/O stations: 64)
Modulation method CMI method
Transmission format Conforming to HDLC (Frame format)
Error control system Retries due to CRC (generating polynomial X16+X12+X5+1) and time out
RAS function
• Loopback function due to error detection and cable break
• Diagnostic function including link line check of host station etc.
Connector
Connector plug for 3C-2V (User prepared):
• BNC-P-3-NiCAu-CF (DDK Ltd.) Connector plug for 5C-2V (User prepared):
• BNC-P-5-NiCAu-CF (DDK Ltd.)
• BNC-P-5DV SA(41) (HIROSE ELECTRIC CO., LTD.) Applicable cable Cables equivalent to 3C-2V or 5C-2V (User prepared) Number of I/O occupied
points 32 points (Intelli: 32 points) Internal current consumption
(5VDC) 0.80A
Weight 0.33kg
(3) Performance specifications of MELSECNET/B data link system and A1SJ71AT23BQ
Table 2.3 Performance specifications of MELSECNET/B data link system and A1SJ71AT23BQ
Item
Specifications MELSECNET/B data link system MELSECNET
mode MELSECNET II
mode MELSECNET II
composite mode Maximum
applicable link points per station
Input (X) Up to the maximum number of I/O points for the CPU module used in the master station is applicable.
(The total number of link points for slave station is equal to the number of link using points for the master station)
Output (Y)
Maximum link points in a system
B 1024 points
(128 byte) 4096 points (512 byte)
W 1024 points
(2048 byte) 4096 points (8192 byte)
Maximum link points per station
Master
station 1024 byte 1024 byte (First half of link parameters) 1024 byte (Latter half of link parameters) Local station
Remte I/O station
512 byte Number of I/O points: 512 points
-512 byte Number of I/O points: 512 points Communication speed 125kbps/250kbps/500kbps/1Mbps
Communication method Half duplex bit serial method Synchronization method Frame synchronization method Transmission path Bus method
Overall cable distance
Changed due to communication speed
(125kbps: 1200m, 250kbps: 600m, 500kbps: 400m, 1Mbps:
200m) Number of connected
stations
Up to 32 (Master station: 1, The total number of local stations and remote I/O stations: 31)
Modulation method NRZI method
Transmission format Conforming to HDLC (Frame format)
Error control system Retries due to CRC (generating polynomial X16+X12+X5+1) and time out
RAS function Diagnostic function including link line check of host station etc.
Connector Terminal block
Applicable cable Shielded twisted pair cable (User prepared) Number of I/O occupied
points 32 points (Intelli: 32 points) Internal current consumption
(5VDC) 0.66A
Weight 0.22kg
Remarks
Overall cable distance
(1) MELSECNET data link system
The overall cable distance refers to a distance from OUT of the master station to IN of the master station via a slave station.
(2) MELSECNET/B data link system
The overall cable distance refers to a distance between stations at both ends.
The overall cable distance of the MELSECNET/B data link system is determined depending on communication speed.
The communiation speed is set by the communication speed setting switch of each link module.
Figure 2.1 Overall cable distance of MELSECNET
Table 2.4 Communication speed and overall cable distance Communication speed Overall cable distance
125kbps 1200m
250kbps 600m
500kbps 400m
1Mbps 200m
Figure 2.2 Overall cable distance of MELSECNET/B
L3 R4 R5 L6
M L1
R2 MELSECNET
Overall cable distance of MELSECNET
Overall cable distance of MELSECNET/B
L3
M L1 L2