Honeywell 621-9937 Description Description Honeywell Parallel I/O Module (8/16/32 Point Related products HONEYWELL 620-0090 HONEYWELL 621-3560 HONEYWELL 621-2200 HONEYWELL 621-0009 HONEYWELL DM106-0-A-00-0-R-1-00000-000-E0 HONEYWELL 621-9990
