For sale is a Allen Bradley Catalog No.1785-L20B/E, PLC-5/20 Processor Module. Revision NO1. Key operated switch to enable / disable programming. There is NO data tape with this processor. NOTE: This is NOT the type of item I have the ability to test. It appears to be in absolutely mint condition, and will ship with the OEM packaging and a pair of correct access keys. I could not find evidence of use.