![background image](http://html.mh-extra.com/html/omron/sysmac-c20k/sysmac-c20k_operation-manual_1633423050.webp)
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Again, this diagram can be redrawn as follows to simplify program structure
and coding and to save memory space.
0006
0007
0105
0005
0001
0002
0003
0004
0000
Address
Instruction
Operands
0000
LD
0006
0001
AND
0007
0002
OR
0005
0003
AND
0003
0004
AND
0004
0005
LD
0001
0006
AND
0002
0007
OR LD
---
0008
AND
0000
0009
OUT
0105
Our last example may at first appear very complicated but can be coded us-
ing only two logic block instructions. The diagram appears as follows:
0000
0001
0105
0002
0003
0100
0101
0004
0005
0500
0006
Block c
Block b
Block a
The first logic block instruction is used to combine the execution conditions
resulting from blocks a and b, and the second one is used to combine the
execution condition of block c with the execution condition resulting from the
normally closed condition assigned 0003. The rest of the diagram can be
coded with ladder instructions. The logical flow for this and the resulting code
are shown below.
0000
0001
0105
0002
0003
0100
0101
0004
0005
0500
0006
Block c
Block b
Block a
OR LD
LD
0000
AND
0001
OR
0500
AND
0002
AND NOT 0003
LD
0100
AND
0101
OR
0006
LD
0004
AND
0005
AND LD
Address
Instruction
Operands
0000
LD
0000
0001
AND
0001
0002
LD
0100
0003
AND
0101
0004
OR LD
---
0005
OR
0500
0006
AND
0002
0007
AND NOT
0003
0008
LD
0004
0009
AND
0005
0010
OR
0006
0011
AND LD
---
0012
OUT
0105
The Ladder Diagram
Section 4-3
Summary of Contents for SYSMAC C20K
Page 1: ...Cat No W146 E1 5 Programmable Controllers SYSMAC C20K C28K C40K C60K ...
Page 2: ...K type Programmable Controllers OPERATION MANUAL Revised July 1999 ...
Page 3: ...iv ...
Page 5: ...vi ...
Page 19: ...7 SECTION 2 Hardware Considerations 2 1 Introduction 2 2 Indicators 2 3 PC Configuration ...