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MELSEC-Q
9 TROUBLESHOOTING
9 TROUBLESHOOTING
The following explains the types of errors that may occur when the QD62(E/D) is used,
and how to troubleshoot them.
9.1 Error Information
The error information detected by the QD62(E/D) is listed in the following chart.
Description/cause Error information display location Action
Overflow error
1) When the linear counter
was used, an add pulse
was further input from the
current value 2147483647
2) When the linear counter
was used, a subtract pulse
was further input from the
current value -2147483648
1) Module status display on the GX Developer system
monitor window
For how to check, refer to this section (1).
No status display: No overflow detected (no error)
Module error
: Overflow being occurred
2) Overflow detection flag
The following value is stored in CH
Overflow
detection flag (Un\G8, Un\G40).
0: No overflow detected
1: Overflow being occurred
3) "Module error status bit" of the module information
read with the UNIRD instruction
00: No overflow detected (no module error)
10: Overflow being occurred (Moderate error)
Preset to clear the overflow
error.
Fuse broken detection
1) The fuse for the
coincidence signal external
output section has blown.
1) FUSE LED on the front of the module (red)
Off: No broken fuse detected
On: Broken fuse detected
2) Fuse broken detection flag (XF)
Off: No broken fuse detected
On: Broken fuse detected
3) "Broken fuse occurrence indicating bit" of the module
information read with the UNIRD instruction
Off: No broken fuse detected
On: Broken fuse detected
Please consult your local
Mitsubishi representative.
POINT
If voltage is not being supplied to the external power supply input terminal, a broken
fuse will not be detected.
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