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Honeywell 621-9928R module for switching between multiple serial communication channels (RS-232/RS-485), connecting PLCs, HMIs and sensors to a central control system. 24 VDC; up to 256 kbps; 2000 VDC isolation.
Honeywell 621-9930 parallel I/O module (PIOM) for Honeywell 620/621 control systems, linking the processor rack with I/O racks. Manages address decoding and card-select signals between the CPM and installed I/O modules.
Honeywell 621-9932 power supply unit delivering regulated 24 VDC to Honeywell I/O racks in TDC 2000/3000 systems. Input 120/240 VAC; hot-swappable; supports redundant configurations.
Honeywell 621-9933C rack-mounted power supply module for IPC 620 and ISSC 600 series control systems. Selectable 115/230 VAC input, 47-63 Hz; +5 VDC / +/-15 VDC outputs; IP20.