Hardware Diagnostics; Q24Dhccpu-V/-Vg/-Ls And Q26Dhccpu-Ls - Mitsubishi Electric MELSEC Q Series User Manual

6.5

Hardware Diagnostics

Hardware diagnostics is a test to check the hardware within the C Controller module.
Hardware diagnostics is useful in the following situations:
• Initial operation
• Troubleshooting
During hardware diagnostics, do not power OFF or reset the C Controller system.
Otherwise, the C Controller module may no longer be started up normally.
If such situation occurs, initialize the C Controller module.
 Page 62, Section 6.1
6.5.1

Q24DHCCPU-V/-VG/-LS and Q26DHCCPU-LS

(1) Diagnostics types
In the hardware diagnostics test, diagnostics on the following items are performed.
(a) Q24DHCCPU-V/-VG
Dot matrix LED
Mode
display
0 M-00
1 M-01
2 M-02
3 M-03
4 M-04
5 M-05
6 M-06
7 M-07
Diagnostic item
Diagnostic test of Mode 1 to
Conducts tests in the order from Mode 1 to Mode 6.
Mode 6
ROM diagnostic test Reads the ROM data and performs error detection.
Work RAM diagnostic test Checks test data by writing/reading/verifying them on the work RAM.
Battery backup RAM Checks test data by writing/reading/verifying them on the battery backup
diagnostic test RAM.
Ethernet diagnostic test Diagnoses the status of the Ethernet port (CH1, CH2 and S CH1).
SD memory card interface
Diagnoses the SD memory card slot status.
diagnostic test
Conducts a self-loopback test of RS-232 connector (CH3).
RS-232 diagnostic test
The wiring for self-loopback is required.
USB diagnostic test Diagnoses the status of the USB connector (USB1, USB2).
Bus diagnostic test Writes/reads/verifies the memory of the internal bus and register.
Dot matrix LED test Shows the dot matrix LED test display.
CHAPTER 6 HARDWARE OPERATIONS
Q24DHC-V Q24DHC-VG Q24DHC-LS
Description
Q26DHC-LS Q12DC-V
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