Honeywell 621-9937 Description Description Honeywell Parallel I/O Module (8/16/32 Point Related products HONEYWELL C7027A1031 HONEYWELL AX51-061-001 HONEYWELL 621-3552RC HONEYWELL STD924-A1A-00000-MB.3H+XXXX HONEYWELL 620-0053 HONEYWELL 621-9990
