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4.A2CCPU
MELSEC·A
No.
Name
Function
(2)
Indicator LEOs
(4) *3
ERROR LED indicating error detection status by the self-diagnosis
function
Lit (ON) :
An error Is detected by the self-diagnosis function.
The LED remains OFF when an error, for which the LED should remain OFF
is set
by
the priority setting, is detected.
Unlit (OFF) :
The A2C is running correctly.
Flicker:
The ennunciator (F) is set ON
by
the sequence program.
(5) *4
SO LED indicating data sending status to I/O modules and remote
terminal modules
Lit (ON) :
The A2C is sending data to an I/O module or remote terminal module
correctly.
Unlit (OFF) :
The SO LEO goes out in the following cases.
• Data are not being sent to an I/O module or remote terminal module.
• There is an error in the initial data or in the initial program.
• The A2C hardware is faulty.
(6)
*5
RD LED indicating data receiving status from I/O modules and remote
terminal modules
Lit (ON) :
The A2C is receiving data from an I/O module or remote terminal module
correctly.
Unlit (OFF) :
The RD LED goes out in the following cases.
• Data are not being received from an 110 module or remote terminal
module.
• Cable connecting to the RDA or ROB terminal Is broken or connection
at the terminal is loose.
• Faulty hardware of A2C, I/O module, and/or remote terminal module.
4-86
I

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