Allen-Bradley PLC-2/30

Introduction to Programming
Chapter 4
433
Figure 4.16
Storage
Bit Example
|| ()
1
|| ()
||
2
||
8
||
3
||
9
||
4
||
10
||
5
||
11
||
6
||
12
||
7
||
13
|| ()
1
||
2
||
3
||
4
||
5
||
6
||
7
||
8
||
9
||
10
||
11
||
12
||
13
Output
Storage Bit
Exceeds Horizontal Display Limit
A. Exceeds 12 Input Instructions in Series
B. Use of Storage Bit
Storage
Bit
Recommendations for Block Instructions
Up to 8 condition instructions in series can be programmed in a rung if
the output is a block instruction.
Up to 8 series condition instructions can be used with a Sequencer Input
instruction if the output is not a block instruction.
Up to 4 series condition instructions can be used with a Sequencer Input
instruction if the output is a block instruction.
Up to 2 branches containing condition instructions can be used in
parallel with a Sequencer Input instruction.
Up to 9 series condition instructions can be used with an Examine On or
Examine Off Shift Bit instruction if the output is not a block instruction.
Up to 5 series condition instructions can be used with an Examine On or
Off Shift Bit instruction if the output is a block instruction.
Up to 3 series condition instructions can be used with a Sequencer Input
and an Examine On or Off Shift Bit in series if the output is not a block
instruction.
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