i have a problem communicating with an AB slc5/04 PLC. I want to establish communication between a laptop and this PLC using a serial link. I have Micrologix 500 English version 3.01.09. When i run auto config, it says it can not verify settings, or sometimes if want it to go online it will say processor is not a PLC one. I have failed to communicate wih 3 SLC 5/04 processors. I am thinking it could be my Micrologix application is too old. Could someone help.