kamalakar Member K Join Date Oct 2005 Location hyderabad Posts 1 Oct 31, 2005 #1 we are using siemens s-7 plc ie cpu 416-2dp. our analog input cards are frequently failing can any body suggest for remedy
we are using siemens s-7 plc ie cpu 416-2dp. our analog input cards are frequently failing can any body suggest for remedy
SimonGoldsworthy Member Join Date Mar 2005 Location England Posts 1,078 Oct 31, 2005 #2 What is the failure mode ? Card produces diagnostic interrupt ? Card gives a fixed value for varying voltages ? How long between failures ? What equipment is the card connected to ? Can you post a schematic ?
What is the failure mode ? Card produces diagnostic interrupt ? Card gives a fixed value for varying voltages ? How long between failures ? What equipment is the card connected to ? Can you post a schematic ?
Doug_Adam Member D Join Date Sep 2002 Location Perth Posts 948 Oct 31, 2005 #3 Have you worked out what is causing it? We have been using S7-400 cards since 1997, with few failures. What is your application?
Have you worked out what is causing it? We have been using S7-400 cards since 1997, with few failures. What is your application?
RMA Member Join Date Sep 2004 Location North of Hamburg, Germany Posts 2,052 Oct 31, 2005 #4 Given the lack of detailed information, this is a wild guess, but incorrect earthing can often cause problems with Siemens I/O cards (at least with the 300 Series).
Given the lack of detailed information, this is a wild guess, but incorrect earthing can often cause problems with Siemens I/O cards (at least with the 300 Series).