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4.
LINKING TO THE AnACPU (WITH DEDICATED INSTRUCTIONS)
AND THE AJ71 PT32-S3
MELSEC-A
4.1.3
Precautions when constructing the system
Twisted-wire-pair cables are used for connection between the
AJ71 PT32-S3 (master module) and the A64RDC.
The maximum communicating distance between stations varies with
cable size when twisted-wire-pair cables are used.
0.2 mm2 to smaller than
0.5
mm2
............
50
m
0.5 mm or larger
100 m
2
......................................
The A64RDC requires external supply
of 24 VDC power
for internal
power supply. Use
the A66PC power supply module
or a general-pur-
pose stabilized power supply (24 VDC). If one power supply is con-
nected to two or more A64RDC or remote I/O modules, select proper
cables and wiring route considering voltage drop due to cables.
Refer to Section 3.1.3 (3) for calculation of voltage drop.
The AJ71PT32-S3 (master module)
of which software version
is 6 or
later can be connected to the A64RDC. The modules of which software
version is A or not specified on the front side cannot be used.
Hardware version
R
Software version
---+=a
IMPORTANT!
Use the AJ71PT32-S3 (master module) in the EXTENSION mode (48
occupied points). Be sure to mount the initial data
ROM storing the total
number
of
remote stations and remote terminal data (set station numbers
of remote terminal modules and corresponding remote terminal numbers)
to the master module.
4 - 3
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