Instruction Manual

Chapter
12
12-1
Sequencers
This describes the three types of sequence instructions:
sequencer input
sequencer output
sequencer load
These instructions either transfer information from the data table to output
word addresses, compare I/O word information with information stored in
tables, or transfer I/O word information into the data table.
Sequencer instructions can transfer information from the data table to
output word addresses for the control of sequential machine operation
(sequencer output); compare I/O word information stored in tables so that
machine operation conditions can be examined for control and diagnostic
purposes (sequencer input); and transfer I/O word information into the
sequencer file (sequencer load).
File instructions operate on files that are one word or 16 bits wide. In
contrast, sequencer instructions operate on files that are up to four words or
64 bits wide. A sequencer file can be represented graphically by a
sequencer table. The length or number of steps (rows) in a sequencer table
can be up to 999. The width of a sequencer table can be up to four words
(columns) as shown in Figure 12.1.
Figure 12.1
Sequencer
T able
Step Word 1 Word 2 Word 3 Word 4
001
002
003
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00110101 11000101 00011101 11001010 10111011 11001011 01011101 01011111
01110100 00011101 00010111 00110011 01010101 01010101
00010101 10100000 10100010 10101000 01010000 01011111 10111100 00110011
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Chapter Objectives
Comparison with File
Instructions