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I
4. A2CCPU
- - - - - - - - - - - - - - - - - - - - MELSEC-A
No.
Name
Function
(3)
Cover 1
A2C CPU cover
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• The cover protecting the A2CCPUP21/R21 PCBs, EP-ROM, battery, etc.
• Open the cover 1 to carry out following operations:
• Installing and removing an EP-ROM.
• Setting for used memory (IC-RAM/EP-ROM)
• Connecting battery connector
• Changing battery
(4)
Cover 2
RS-422 connector cover
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The cover for the RS-422 connector used to connect a peripheral device to the
A2C.
(5)
Terminal block
Terminal block for connecting external devices to the A2C
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• The terminals used to connect the following devices:
.100/200 VAC power supply
• I/O modules and remote terminal modules
• Grounding cable
• Changing tap configuration meeting available input voltages
(6)
Connector
Fiber-optic cable connector
I
1
• Connect the cable as illustrated below.
It=
Cff?
=rr
'T
'<,
IN
OUT
Forward
Forward
loop send
loop send
Reverse
Reverse
Master station
Station 1
Station 2
loop receive
loop receive
(equipment No.1)
(equipment No.2)
(7)
Connector
Coaxial cable connector
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• Connect the cable as illustrated below.
r-;
~
IN
OUT
IN
~1,
IN
F·RD
F-RD
F-RD
OUT
J
"'
1
R·RO
R·RO
IN
OUT
IN
I
R·SO
F·SO
1
IN
I
OUT
1
OUT
1
IN·R·SO
OUT·R-RO
R-SO
F-SO
R-SO
F·SO
Reverse
Reverse
loop
loop
receive
send
IN-F·RO
OUT·F-SD
Forward
Forward
loop
loop
send
receive
Master station
Station 1
Station 2
(equipment No.1)
(equipment No.2)
4-87

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