Model Explanation51109919-10051109919: Basic model (I/O terminal board type)-100 ...

Model Explanation51109881-100: Honeywell standard part number, where51109881: Ba ...

Model Explanation51109818: Honeywell TDC3000 Power Family100: Hardware Version ( ...

Model Number Explanation51109701: Honeywell TDC3000 floppy disk drive family100: ...

Model Number Explanation51109693: Honeywell UCN/TDC3000 Grounding Components Fam ...

Model Number Explanation51109456: Honeywell TDC 3000 PM/APM power supply family2 ...