Transmission Cable Voltage Drop Detection Function - Mitsubishi Electric MELSEC-Q Series User Manual

8.4

Transmission Cable Voltage Drop Detection Function

This function detects a voltage drop in the 24VDC external power supply, enabling the master module to detect a
failure in the 24VDC external power supply or a wiring error from the upper system.
For the specifications of the 24VDC external power supply to the master module, refer to Page 26, Section 3.2.1.
(1) Transmission cable voltage drop status
When the system is in the following status, a voltage drop in the 24VDC external power supply has been
detected.
• The ALM LED flashes at 0.2 second intervals.
• Transmission cable voltage drop error (Xn3) turns on.
• Transmission cable voltage drop error (error code: 00C8
(Un\G10256) and 0FFF
• An error (error code: 00C8
of GX Works2.
• The AnyWireASLINK bit transmission stops.
*1 If multiple errors occur simultaneously, the latest error is displayed.
(2) How to recover from the transmission cable voltage drop status
How to recover from the transmission cable voltage drop status is as follows.
1.
Check the voltage of the 24VDC external power supply and replace the power supply or check the
wiring, as necessary.
When the transmission cable voltage drop is corrected, AnyWireASLINK bit transmission is resumed
automatically.
2.
Power off and on the AnyWireASLINK system or turn on and off Error flag clear command (Yn0).
The following status is resulted:
• Transmission cable voltage drop error (Xn3) turns off.
• The ALM LED turns off.
• The data in Latest error code storage area (Un\G10256) and Latest error ID storage area (Un\G10257) are
cleared.
64
is stored in Latest error ID storage area (Un\G10257).
H
) is displayed in the detailed information section on the system monitor window
H
*1
*1
) is stored in Latest error code storage area
H
*1