While there can be many challenges to an I/O upgrade, they are inevitable and worth the trouble, especially with older systems. With proper planning and attention to detail, upgrades can go smoothly with minimal interruption to your facility.

David McCarthy, President and CEO of TriCore, Inc. explains the details in Control Engineering at: http://www.controleng.com/industry-news/more-news/single-article/io-module-replacement-what-you-need-to-know/d2735b1ec6.html