Which points belong on a control drawing?
By Bassirou Thiam, building automation engineer · Updated
Show the physical points installed under the project, plus the network points that the sequence of operations actually uses. A BAS integrates a lot of third-party equipment; drawing every point every device exposes makes the drawing unreadable and adds nothing the sequence needs.
Physical points
Every sensor, actuator, relay and contact wired to a controller terminal under this contract appears, with its point type. They are what the technician checks point to point.
Network points
From integrated equipment (a chiller, a VFD, a meter), show only the values read or written by the sequence or required for monitoring by the owner. The full device map stays in the manufacturer's documentation.
Sources
Related
GuidesWhat goes in a BAS points listThe columns a BAS points list needs, the BACnet point types, and a method to build it from the control schematic. Free Excel template included.
QuestionsShould the engineer include a points list in the design documents?Engineers worry a points list invites change orders. Controls contractors say the opposite: why a points list in the design reduces RFIs and extra costs.
GlossaryWhat is an I/O point in building automation?Definition of an I/O point in building automation: a physical input or output wired to a controller terminal, as counted in the points list.