Mitsubishi QJ71MB91, User Manual

Page: 143 / 372

6
PRE-OPERATIONAL PROCEDURES AND SETTINGS
6.4 Unit Tests
6.4.1 Hardware test
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6.4 Unit Tests
This section explains the unit tests performed before operating the QJ71MB91.
6.4.1 Hardware test
The hardware test is a test for checking the RAM and ROM of QJ71MB91.
(1) Hardware test procedure
Perform the hardware test according to the following procedure.
(2) Hardware test contents
The QJ71MB91 performs the following tests once.
(a) ROM check
Reads ROM data and perform a sum check.
(b) RAM check
Writes test data in RAM and read the written data to perform the check.
Figure 6.4 Hardware test procedure
Start
STOP the programmable controller CPU.
Disconnect the communication cable connected to
the target device.
Set it to the hardware test mode.
(switch 1, 3 = 000D
H
)
Reset the programmable controller CPU.
Test execution
(approx. 2 seconds)
Normal/Error
NEU.LED ON:
Normal completion
NEU.LED and ERR.LED ON: Error completion
Monitor the buffer memory and check
the error.
End
Section 6.6
( This section (3))