All, I've gotten about halfway through the messages in the board, and will continue looking for an answer, but thought I'd post all the same. It's been about 10 years since my A/B programming course, and 8 since I've actually programmed. I've set up my Micrologix 1500 with 3 additional modules, my analog module (1769-IF4) in the last position. I've used the I/O configurator in RS Logix 500 to set the INPUT RANGE to +/-10VDC and the DATA FORMAT to Engineering Units. Now, my question is HOW to read the analog I/O? I'm thinking I have to: A) Use a BCD type command (i.e. FRD from I:3/0) to move the data from the I/O point into an integer data file (N:7/0 for example) B) Then exploit the value in the N7 register each scan? Does this sound about right? Many thanks in advance for any help. Roger