Transmission Cable Voltage Drop Detection Function - Mitsubishi Electric MELSEC iQ-R AnyWireASLINK User Manual

1.8
Transmission Cable Voltage Drop Detection
Function
This function detects a voltage drop in the 24VDC external power supply, enabling the RJ51AW12AL 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 RJ51AW12AL, refer to the following.
 MELSEC iQ-R AnyWireASLINK Master Module User's Manual (Startup)
How to check the transmission cable voltage drop status
When the AnyWireASLINK system is in the following status, a voltage drop in the 24VDC external power supply has been
detected.
• The ALM LED flashes at 0.4-second intervals.
• 'Transmission cable voltage drop error' (X3) turns on.
• Transmission cable voltage drop error (error code: 0CC8H) is stored in 'Latest error code storage area' (Un\G10256) and
0FFFH is stored in 'Latest error ID storage area' (Un\G10257).
• An error (error code: 0CC8H) is displayed on an engineering tool. ( Page 75 Checking with the "Module Diagnostics"
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window)
• The AnyWireASLINK transmission stops.
*1 If multiple errors occur simultaneously, the latest error is displayed.
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, the AnyWireASLINK transmission resumes automatically.
2.
Power off and on the AnyWireASLINK system or turn on and off 'Error flag clear command' (Y0).
The following status is resulted:
• 'Transmission cable voltage drop error' (X3) 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.
1 FUNCTIONS
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1.8 Transmission Cable Voltage Drop Detection Function

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