Unit Tests; Hardware Test - Mitsubishi QJ71MB91 User Manual

6
PRE-OPERATIONAL PROCEDURES AND SETTINGS

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.
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
Reset the programmable controller CPU.
NEU.LED ON:
Normal completion
(2) Hardware test contents
The QJ71MB91 performs the following tests once.
(a) ROM check
(b) RAM check
Start
)
H
Test execution
(approx. 2 seconds)
NEU.LED and ERR.LED ON: Error completion
Normal/Error
End
Figure 6.4 Hardware test procedure
Reads ROM data and perform a sum check.
Writes test data in RAM and read the written data to perform the check.
Section 6.6
Monitor the buffer memory and check
the error. ( This section (3))
6.4.1 Hardware test
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6.4 Unit Tests
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