Mitsubishi Electric Melsec-k Instruction Manual page 71

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5. OPERATING PROCEDURE
(5) Sometimes communication data is interrupted and communication error occurs, resulting in
disconnected channel
Master channel
In the case of K3CPUP2: Abort error display
"LE
~ 3 ' ~
Number 1 slave channel
ABORT: Off
Number
5
slave channel
ABORT: Lit instantaneous1
Number 2 slave channel
ABORT: Off
Error section or instantaneous power failure
Number 4 slave channel
ABORT: Lit instantaneously
Number 3 slave channel
ABORT: Lit instantaneously
Note: Make check in order of optical fiber cable connection.
(In
this case, there is no relation to channel number.)
Fig. 5.4
?
As shown in Fig. 5.4, carefully looking a t the LED display "ABORT" of each channel in the
off, channels upstream of that channel are normal. I f there is a channel of which ABORT has
L
loop allows judgement where the error exists
iti
the loop. Carefully look a t the LED "ABORT"
in due order, beginning with that of the master channel. When ABORT of a channel is always
been lit instantaneously, the error is due to one of the following factors. (Between Number
2
and 3 channels in Fig. 5.4)
1) The optical fiber cable is connected improperly. (Between Number 2 and 3 channels in
Fig.
5.4)
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i
2) Failure of optical transmitter located upstream by 1 channel (Number
2
channel in Fig. 5.4)
3) Failure of optical receiver of its own channel (Number 3 channel in Fig. 5.4)
4) Instantaneous power failure (The power of Number 2 channel is unstable in Fig. 5.4)