Mitsubishi Electric MELSEC Q Series User Manual page 78

(b) Q24DHCCPU-LS and Q26DHCCPU-LS
Dot matrix LED
Mode
display
0 M-00
1 M-01
2 M-02
5 M-05
6 M-06
7 M-07
(2) Operating procedure
(a) Preparation
Before performing the hardware diagnostics test on the Q24DHCCPU-V/-VG/-LS and Q26DHCCPU-LS, take
the steps listed below:
1.
Install the module.
Install the power supply module and the Q24DHCCPU-V/-VG/-LS and Q26DHCCPU-LS to the base unit.
Insert the Q24DHCCPU-V/-VG/-LS and Q26DHCCPU-LS into the CPU slot.
Do not install any module other than a power supply module and the Q24DHCCPU-V/-VG/-LS and
Q26DHCCPU-LS.
● For C Controller modules listed below, the hardware diagnostics can be performed even when the module is mounted on
the slot other than the CPU slot.
To perform the hardware diagnostics with the module mounted on the slot other than the CPU slot, mount another CPU
module on the CPU slot.
Although an error may be detected on the CPU module mounted on the CPU slot, the hardware diagnostics can be
performed.
• Q24DHCCPU-V with a serial number whose first five digits are "15042"
• Q24DHCCPU-VG
2.
Check the wiring.
Check that the power supply wiring is property arranged.
Do not connect any cable other than power supply cables.
3.
Prepare for respective diagnostics as necessary. ( Page 77, (2)(b) in this section)
4.
Power on.
Check that the power supply voltage is within the specified range.
Check that the RUN/STOP/MODE switch is positioned in STOP.
76
Diagnostic item
Diagnostic test of Mode 1 to
Mode 6
Battery backup RAM
diagnostic test
Ethernet diagnostic test
USB diagnostic test
Bus diagnostic test
Dot matrix LED test
Diagnoses in order of Mode 1  Mode 2  Mode 5  Mode 6.
Checks test data by writing/reading/verifying them on the battery backup
RAM.
Diagnoses the status of the Ethernet port (S CH1).
Diagnoses the status of the USB connector (USB2).
Writes/reads/verifies the memory of the internal bus and register.
Shows the dot matrix LED test display.
Description