Plc-2 Sequencer Outputs - Allen-Bradley A-B QUALITY DL20 Series User Manual

Table G.A

PLC-2 Sequencer Outputs

BCD
PC Word Step
Format
037 1 3010
040 2 0000
041 3 2012
042 4 0000
043 5 1034
044 6 0000
045 7 3020
046 8 0000
The steps of a sequencer instruction can be viewed on the 1770-T3 Industrial
Terminal by moving the cursor to the sequencer instruction and pressing
<Display> 1 for BCD display format or <Display> 0 for binary display
format.
The NULL STEPS shown in the above sequence are added to satisfy timing
requirements of the DL20.
In the following program example, steps 1 through 8 shown above represent
word 037-046 (octal) as defined in the sequencer instruction.
The resulting message would be displayed:
The variable 1234 shown on the above display and in the example steps is for
illustration purposes only. Actually, the free running timer 032 in the rung
examples to follow range from 0 to 999.
Appendix G
Application Notes
Binary Format
0011000000010000
0000000000000000
0010000000010010
0000000000000000
0001000000110100
0000000000000000
0011000000100000
0000000000000000
TIMER 032 = 1234
Comments
Special Message 10 (Clear
Queues)
Null Step
Hi Data
(1st Variable)
Null Step
Low Data
(1st Variable)
Null Step
Message Member
Null Step
G–5