Function Blocks
SEQ Sequencer Function Block
Revision 11 HC900 Hybrid Control Designer Function Block Reference Guide 335
2/07
SEQ Sequencer Function Block
Description
The SEQ label stands for Sequencer.
This block is part of the
Fast Logic categories.
Function
The HC900 controller supports up to 4 Sequencer function blocks, greatly enhancing configuration of
sequence operations.
Each sequencer supports up to 16 digital outputs that may be either on or off in each of 50 states e.g.
PURGE, FILL, HEAT, etc, per block The sequencer may have up to 64 sequential steps that activate
within the states of the process.
Steps of the sequencer may be configured to advance based on time, on digital event (2 per step), or a
manual advance. A separate jog function is also provided.
The function can also configure an analog output on a step basis. The operational sequence for the steps is
retained in a separate sequence file in the memory of the controller that may be selected on-demand
through a user interface or via a recipe.
Up to 20 sequences may be stored.
Inputs
ENA
= ON - block executes the programmed sequence
(Not connected, always enabled)
OFF - block holds its last output states and step time
NSEQ = Sequence Number. See ATTENTION below.
NSTEP = Starting Step Number. See ATTENTION below.
^SET = Pulse input to load NSEQ and NSTEP numbers. See ATTENTION below.
^JOG = Pulse input to jog to step number
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