Omron C20K User Manual
63
Differentiated Conditions
Work bits can also be used if differential treatment is necessary for some, but
not all, of the conditions required for execution of an instruction. In this exam-
ple, IR 0100 must be left on continuously as long as IR 0001 is ON and both
IR 0002 and IR 0003 are OFF, or as long as IR 0004 is ON and IR 0005 is
OFF. It must be turned ON for only one cycle each time IR 0000 turns ON
(unless one of the preceding conditions is keeping it ON continuously).
not all, of the conditions required for execution of an instruction. In this exam-
ple, IR 0100 must be left on continuously as long as IR 0001 is ON and both
IR 0002 and IR 0003 are OFF, or as long as IR 0004 is ON and IR 0005 is
OFF. It must be turned ON for only one cycle each time IR 0000 turns ON
(unless one of the preceding conditions is keeping it ON continuously).
This action is easily programmed by using IR 0112 as a work bit as the oper-
and of the DIFFERENTIATE UP instruction (DIFU(13)). When IR 0000 turns
ON, IR 0112 will be turned ON for one cycle and then be turned OFF the next
cycle by DIFU(13). Assuming the other conditions controlling IR 0100 are not
keeping it ON, the work bit IR 0112 will turn IR 0100 ON for one cycle only.
and of the DIFFERENTIATE UP instruction (DIFU(13)). When IR 0000 turns
ON, IR 0112 will be turned ON for one cycle and then be turned OFF the next
cycle by DIFU(13). Assuming the other conditions controlling IR 0100 are not
keeping it ON, the work bit IR 0112 will turn IR 0100 ON for one cycle only.
0112
DIFU(13) 0112
0000
0001
0002
0003
0004
0005
0100
Address
Instruction
Operands
0000
LD
0000
0001
DIFU(13)
0112
0002
LD
0112
0003
LD
0001
0004
AND NOT
0002
0005
AND NOT
0003
0006
OR LD
---
0007
LD
0004
0008
AND NOT
0005
0009
OR LD
---
0010
OUT
0100
4-9
Programming Precautions
The number of conditions that can be used in series or parallel is unlimited.
Therefore, use as many conditions as required to draw a clear diagram. Al-
though very complicated diagrams can be drawn with instruction lines almost
forming mazes, there must not be any conditions on instruction lines running
vertically between two other instruction lines. Diagram A shown below, for
example, is not possible, and should be redrawn as diagram B.
Therefore, use as many conditions as required to draw a clear diagram. Al-
though very complicated diagrams can be drawn with instruction lines almost
forming mazes, there must not be any conditions on instruction lines running
vertically between two other instruction lines. Diagram A shown below, for
example, is not possible, and should be redrawn as diagram B.
Instruction 2
Instruction 1
0002
0003
0000
0001
0004
Diagram A
Instruction 1
0004
0003
0000
0001
Diagram B
0002
Instruction 2
0004
0000
0001
Address
Instruction
Operands
0000
LD
0001
0001
AND
0004
0002
OR
0000
0003
AND
0002
0004
Instruction 1
0005
LD
0000
0006
AND
0004
0007
OR
0001
0008
AND NOT
0003
0009
Instruction 2
The number of times any particular bit can be assigned to conditions is not
limited, so use them as many times as required to simplify your program.
limited, so use them as many times as required to simplify your program.
Programming Precautions
Section 4-9