Mitsubishi 800 Series User Manual page 88

5, H W n g Component
Equipment Modules
MELEG
GOT
The st?#-test procedure
is
described below.
L
Link
con-
nector of
data link
module
for self-test
Reverse side of
data link module
Data link module LED section
/
@
Turn off the power supply to the GOT, and connect the link
cable between the link connectors of the data link module, in a
folded-back connection. For instructions on connecting a co-
axial cable, please refer to the MELSECNET and MELSECNET/
B Data Link System Reference Manuals.
A twisted-pair caMe does not need to be connected.
@
Set the
mode
change setting switch on the data link module to
"7" (this is the self-test setting).
@
Turn on the power supply to the GOT and start the self-test.
The test status and results are shown in the display section of
the data link module LED.
(Judging the test results)
0
Normal -The fobwing flash
i n
sequence:
"CRC",
"OVER",
"AB.IF, "TIME", "DATA,
Error
-
One of the above LEDs lights, and the test stops. The following should be
"UNDER".
checked as possible causes of the error:
.
A cable may be disconnected.
.
The transmission side and receiving side have not been connected with a cable.
The transmission side of the main loop is connected to the transmission side of the
auxiliary loop, and the receiving side of the main loop is connected to the receiving
side of the auxiliary loop.
There
is
a problem with the hardware of the data link module.
Reverse side
+
wDEml
of
data link module
@ If the results of the test are normal, the test procedure is con-
cluded.
Set the mode change setting switch of the data link module to
"0" or
" I " ,
and turn on the power supply to the GOT (this sets
the on-line mode).
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