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4. A2CCPU
- - - - - - - - - - - - - - - - - - - - MELSEC-A
No.
Name
Function
(6)
RD LED
The data receiving state indicator LED (receiving from 1/0 modules and remote
terminal modules)
• ON:
The A2C is receiving
data from an I/O module or remote terminal module
correctly.
• OFF:
The RD LED goes out in the following cases.
• The A2.C is not receiving data from an 1/0 module or terminal module.
• Cable connecting to the ADA or ROB terminal is broken or connection at the
terminal is 100s8.
• Hardware faulty of the A2C,
va
modu le, and/or remote terminal module.
(7)
Cover 1
A2CCPU
cover
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• The cover protecting the A2C PCBs, EP-ROM. battery
I
etc.
• Open 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
Note:
Before opening or closing cover 1, remove the RUN key switch and RS-422
connector.
(8)
Cover 2
RS-422 cover
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• The cover for the RS-422 connector used to connect a peripheral device to the
A2C.
(9)
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
• Chenging input voltage (100/200 VAC).
4-79

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