Sequencers; Overview - Honeywell 900 User Manual

Overview

The Sequencer function block controls the states of up to 16 digital outputs and one analog output. Each
combination of output states represents a "State" of the Sequencer block, such as PURGE, FILL, HEAT, or
COOL. Each function block supports up to 50 States. The user sets up these states during the configuration
of the function block.
The user-configurable program that runs within the Sequencer function block is called a "Sequence." Each
Sequence contains up to 64 "Steps"; each Step activates one of the 50 States supported by the function
block. Note that the same State can be used by more than one Step within a Sequence.
Each Step within a Sequence may be configured to advance to any other Step based on time (hours or
minutes), digital event (2 per Step), or manual advance. A separate jog function is also provided.
The controller maintains a pool of 20 user-configurable Sequences in its memory. The Sequences in the
pool can be assigned to run within any of the Sequencer function blocks. Once it has been loaded into a
Sequencer function block, a Sequence can be modified through the menus provided on this Control Station.
A modified Sequence can also be saved back to the pool for later recall, if desired.
Revision 9
May 2014

Sequencers

900 Control Station User Guide 141