Internet PLC Forum

General => Technical support => Topic started by: raan on November 30, 2007, 11:18:12 PM

Title: Hooked up power to the wrong connector
Post by: raan on November 30, 2007, 11:18:12 PM

I inadvertently hooked up +24vdc to the rs485 terminals on a t100md. Needless to say the plc no longer communicates (tried *IR no response) and the PLC is no longer running the program it was loaded with. Can  I replace some ICs and/or components to resurrect it or is it permanently damaged?
 :'(

Title: Re:Hooked up power to the wrong connector
Post by: support on December 01, 2007, 03:19:18 PM

YOu can replace the 8-pin IC 75HVD3082 (an easier to find replacement part is 75176) and it should work.

If you are not using the RS485 then you can simply remove the 75HVD3082 and the PLC should work again if there is no other damages.

Title: Re:Hooked up power to the wrong connector
Post by: raan on December 02, 2007, 06:18:17 AM

Thanks. I tried removing the 8pin dip but it still did not work. I am going to replace the 74hc595 and see if this fixes the problem

Title: Re:Hooked up power to the wrong connector
Post by: raan on December 03, 2007, 01:28:17 AM

Changing out the 74hc595 ic did not correct the problem. Do you have any type of board repair or exchange?

Title: Re:Hooked up power to the wrong connector
Post by: support on December 03, 2007, 09:39:23 PM

Please email to support@tri-plc.com for an RMA request.