Specifications

MELSECNET/II•B
■ AJ71AP21, AJ71AR21, AJ71AT21B
MELSECNET interface module
The MELSECNET interface module allows the host PLC CPU
to be connected on to the MELSECNET data link system.
The module allows the PLC CPU to act as a master or local
station on the network, as defined by the switch setting on
the module. There are two interface modules, one for fiber
optic cable networks and the other for coaxial cable
networks.
A maximum of one module can be used per PLC CPU.
■ AJ71AP21, AJ71AR21, AJ71AT21B specifications
AJ71AP21 AJ71AP21-S3 AJ71AP21GE AJ71AR21 AJ71AT21B
Communication speed 1.25M bps 1M - 125kbps
Communication method Half duplex bit serial
Synchronization method Frame synchronization
Topology Dual loop Bus
Distance (Overall) 10km (32808.4 ft)
0.1 - 1.25 km
(328.1 - 4101 ft)
Distance (Between PLCs) 1 km (3280 ft) 2 km (6561.7 ft) 2 km (6561.7 ft) 500 m (1640.4 ft) -
Number of connected stations Max. 65 (1 master, 64 slaves)
Max. 32
(1 master, 31 slaves)
Modulation CMI method Manchester
Transmission format Conforms to HDLC
Error control system Retry due to CRC time over
Loop back function Available None
Cable type QSI-200/250 GI-50/125 GI-62.5/125 Coaxial (75 ohm) Twisted pair
Number of B/W B:4096, W:4096 (MELSECNET II mode)
Number of I/O points 32
Current consumption (DC5V) 0.33A 0.8A 0.66A
■
AJ72T25B MELSECNET/B remote I/O interface
The module allows decentralized I/O control via the MELSECNET/B network. It can control up to 512 I/O points under a
master PLC CPU.
■
AJ72T25B specifications
Connector type Terminal block
Cable required Shielded twisted pair
Interface standard RS485
Maximum number of I/O points 512
Current consumption (5VDC) 0.3A
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