I need to moniter some pressures for spikes and what state the machine is in when it happens. I am putting additional pressure transducers on the machine that are higher rated than the ones used in the process to catch the spike. I have programmed a micrologix 1200 for the tranducers and to capture the event. The machine itself has two stations each with a PLC-5. All that I need from the two PLC-5's is the state each one is in in the program when a pressure spike happens. The state is stored in R6:0 on both PLC-5's. I am using the micrologix because I have to be as minimally invasive as I can to the machine because any code change, even for testing, requires a mountain of paperwork wich can take months to get all the signatures required. So after all this rambling my question is can I get the micrologix to communicate with the PLC-5's and do it without doing any program changes to the 5's. The PLc-5's have the 5/11 CPU and do not have ethernet cards in the rack. I was hoping to use the Rs232 communications. If this will not work what could I do instead. I also have the parts to put together another PLC-5 instaed of using the microlgix but I have never programmed PLC-5. Thank you for any advice and solutions.