884 SEQ and DRUM


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I have a customer upgrading a PLC from an 884 to a 984-385E. This program uses SEQ and DRUM commands. I think I can convert the SEQ to a UCTR with some ease. But I don't know what to do about the DRUM. I know there was a loadable for this, but I don't know if it will work with my 984-385E. Can someone give me any help with converting this program?