Morning
It was finally time to decipher the old SLC 150 program from the welders. I spent some time on the hunt for good drawings of the vacuum system, which took longer than one might hope it would. I found that there are a range of drawings for EBW2 and 3 if you know where to look. I ran through the program, marking which systems came on when and for what reason. There was only one real snag, which was the small blower on the tank. It had some funky logic with two timers that took a little time to figure out.
Afternoon
With a better understanding of the program itself, it was time to look at the upgrade PLC. The MicroLogix 1100 has the ethernet capability that we need, but it may be limiting on the I/O expansion. It doesn't look like that unit will work. After that, I started looking at the Compact Logix that were put in the EBW4 upgrade. Those units are more expensive, but they have more functionality as well.
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