Instruction Manual

Sequencers
Chapter 12
12-4
Figure 12.3
Sequencer
Instructions
Key Sequence
1770-T3 Display
Instruction Notes
EN
Sequencer Output
Counter Addr:
Current Step:
Seq Length:
030
001
001
DN
Words Per Step:
File:
Mask:
1
110-110
010-010
030
17
030
15
SEQ 0
Output Words
SEQ 1
SEQ 2
Output instruction.
Increments, then transfers data.
Same data transferred each scan that the rung is true.
Counter is indexed by the instruction.
Input instruction.
Compares input data with current steps for equality.
Counter must be externally indexed by your program.
Requires 5-8 words of your program.
Outupt instruction
1: 010 2:
3: 4:
Unused output bits can be masked.
Requires 5-9 words of your program.
030
000
001
1
110-110
010-010
1: 010 2:
3: 4:
EN
030
001
001
DN
1
110-110
030
17
030
15
1: 010 2:
3: 4:
Increments, then loads data.
Counter is indexed by the instruction.
Does not mask.
Requires 4-7 words of your program.
NOTE: Numbers shown are default values. Numbers in shaded areas must be replaced by your entered values. The number of
default address digits initially displayed (3 or 4) will depend on the size of the data table.
Sequencer Input
Counter Addr:
Current Step:
Seq Length:
Words Per Step:
File:
Mask:
Sequencer Load
Counter Addr:
Current Step:
Seq Length:
Words Per Step:
File:
Input Words
Output Words
Here is an explanation of each value:
This Value: Stores the:
Counter Address Address of the instruction in the accumulated value area of
the data table
Position Position in the sequencer table (accumulated value of counter)
Seq Length Number of steps (preset value of the counter)
Words per Step Width of the sequencer table
File Starting address of the source file
Mask Starting address of the mask file
Word Address Address of the source word or destination word outside of the file
Output Words Words controlled by the instruction
Load Words Words fetched by the instruction
Input Words Words monitored by the instruction