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MELSEC-Q
4 SETUP AND PROCEDURES BEFORE OPERATION
4.4 Hardware Test
The hardware test checks whether or not the standalone module operates normally. It
performs a ROM check, RAM check, self-loop test, etc.
Be sure to perform the hardware test before configuring a system.
For more details on the test related to DeviceNet communication, perform a test by
referring to Section 4.6, "Communication Test" after wiring is complete.
Execute the hardware test in the following sequence:
Start
Set mode 9 and turn ON the power.
Error occurred?
Perform RAM check.
(Displays "2" at buffer memory 062E
H
.)
Yes
No
End
Calculates ROM's sum check.
(Displays "1" at buffer memory 062E
H
.)
Abnormal completion
(Illuminates the ERR. LED and stores
the error code at buffer memory 062F
H
.)
Error occurred?
Perform microcomputer check.
(Displays "3" at buffer memory 062E
H
.)
Yes
No
Error occurred?
Normal completion
(Illuminates the MS LED in green and
stores "FFFF" at buffer memory 062E
H
.)
Yes
No
Perform wiring of the network power
supply, and turn ON the power.
Perform CAN controller check.
(Displays "4" at buffer memory 062E
H
.)
Error occurred?
Yes
No
Abnormal completion
(Illuminates the ERR. LED and stores
the error code at buffer memory 062F
H
.)
Abnormal completion
(Illuminates the ERR. LED and stores
the error code at buffer memory 062F
H
.)
Abnormal completion
(Illuminates the ERR. LED and stores
the error code at buffer memory 062F
H
.)
[LED display]
QJ71DN91
RUN
MS
NS
ERR.
QJ71DN91
RUN MS
NS
ERR.
QJ71DN91
RUN MS
NS
ERR.
Performing hardware
test
Normal completion
Abnormal completion
Flashes the
MS LED.
Turns OFF the MS LED.
Turns ON the ERR. LED.
Illuminates the MS LED in green.
Turns OFF the ERR. LED.