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blocks to be combined, starting each block with LOAD or LOAD NOT, and
then to code the logic block instructions which combine them. In this case,
the instructions for the last pair of blocks should be combined first, and then
each preceding block should be combined, working progressively back to the
first block. Although either of these methods will produce exactly the same
result, the second method, that of coding all logic block instructions together,
can be used only if eight or fewer blocks are being combined, i.e., if seven or
fewer logic block instructions are required.
The following diagram requires AND LOAD to be converted to mnemonic
code because three pairs of parallel conditions lie in series. The two options
for coding the programs are also shown.
00000
00002
00004
00001
00003
00005
00500
Address
Instruction
Operands
Address
Instruction
Operands
00000
LD
00000
00001
OR NOT
00001
00002
LD NOT
00002
00003
OR
00003
00004
AND LD
—
00005
LD
00004
00006
OR
00005
00007
AND LD
—
00008
OUT
00500
00000
LD
00000
00001
OR NOT
00001
00002
LD NOT
00002
00003
OR
00003
00004
LD
00004
00005
OR
00005
00006
AND LD
—
00007
AND LD
—
00008
OUT
00500
Again, with the method on the right, a maximum of eight blocks can be com-
bined. There is no limit to the number of blocks that can be combined with
the first method.
The following diagram requires OR LOAD instructions to be converted to
mnemonic code because three pairs of series conditions lie in parallel to
each other.
00000 00001
00002 00003
00040 00005
00501
The first of each pair of conditions is converted to LOAD with the assigned bit
operand and then ANDed with the other condition. The first two blocks can
be coded first, followed by OR LOAD, the last block, and another OR LOAD;
Basic Ladder Diagrams
Section 4-3
Summary of Contents for SYSMAC C200H
Page 1: ...OPERATION MANUAL C200H CPU01 E 03 E 11 E SYSMAC Programmable Controllers Cat No W130 E1 05 ...
Page 2: ...C200H Programmable Controllers CPU01 E 03 E 11 E Operation Manual Revised June 2003 ...
Page 3: ...iv ...
Page 5: ...vi ...
Page 8: ...TABLE OF CONTENTS ix Glossary 345 Index 363 Revision History 369 ...
Page 342: ...336 Programmer Program Date Page Word Contents Notes Word Contents Notes Data Storage ...
Page 374: ...Cat No W130 E1 05 C200H Programmable Controllers CPU01 E 03 E 11 E OPERATION MANUAL ...