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ML1400 Solid LED Fault & Power, Blank Display

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1766-L32BXB Ser B FW 13 In Service 100% 1yr. w/Parker Automation Touchscreen/Ethernet Comm.

Note: All Rockwell Software For ML1400 Ser B and ML1400 (Default) CH-0 (8-Pin Din) DF1 RS232, PC-COM1 Cable & Settings Are Same

          When Working, Did Revisit RSLink/DF1/Auto-Config, STILL FAILS. PC Has True 9-DB Com-1, PC Device Mgr, COM-1 Set To

          ML1400 Default Baud, ect, PC No Conflicts.  In All AB Software & Comm Is Not My Problem. Rockwell Software Registered To Me.

AB Manual Ref: Hardware Failure  ( I Would Assume PLC Death/Brick) Discovered a Micrologix 1400 Backlight Life Is 50K Hrs

Verses a EL Backlight Installed Is 2K Hrs. I Can Temp/Do w/o a Display For Now, RSLink, No Comm

The PLC Power Supply Is a ACOPIAN VA24MT210, 24Vdc Regulated, DMM=23.75vdc, When Power Applied To ML1400 DMM=4.63vdc

ML1400 POWER Solid Green, FAULT Solid Red, LCD Display Remains Blank.

Can Anyone Else Confirm This PLC Current Status?

FYI, AB Knowledge Base, Answer 37814/898272 Not Public, ML1400 Red Fault, Only Related Item Not View When Searched

Thank You         Sempter-Fi

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WAQ!!

I have seen this with smaller power supplies where the inrush current(of the PLC) causes this.

Can you try a different power supply?

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Evaluation:  The Acopian Pwr Supply, Power-On/Inrush DMM VDC MAX= 23.90, Normal=23.90Vdc

                      2nd 24VDC Power Supply, SKYNET Electronics M# SNP-A129, [Parker Automation] Pwr-On/Inrush Max=23.87, Normal=23.84Vdc

                     Same PLC Fault Condition, Going To Contact Allen Bradley Tech Support Today

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AB Tech Support, Confirmed PLC Dead Possible Internal Short, Steve Stated PLC w/Current LED Status,

Should Still have a Operating LCD Display, Due To Voltage Drop On DMM When ML1400 Pwr-Up Might Explain Blank LCD.

PLC Has Seen Its Better Days/ Repair or Trash.   We Did Try Disconnecting Battery, Then Shorted Out Both Battery Leads On PLC

To Drain Internal [Memory/Program] Capacitor, 5seconds, Can Leave Battery Disconnected, Try PLC Again.

ML1400 Will Retain Program For Aprox 2 Weeks w/BAT-LO Condition.

AB Tech Support 440 646-3223...end

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