Selectron LD-007 Manual de Instruções Página 102

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ple, IR 00100 must be left ON continuously as long as IR 00001 is ON and
both IR 00002 and IR 00003 are OFF, or as long as IR 00004 is ON and IR
00005 is OFF. It must be turned ON for only one cycle each time IR 00000
turns ON (unless one of the preceding conditions is keeping it ON continu-
ously).
This action is easily programmed by using IR 22500 as a work bit as the op-
erand of the DIFFERENTIATE UP instruction (DIFU(13)). When IR 00000
turns ON, IR 22500 will be turned ON for one cycle and then be turned OFF
the next cycle by DIFU(13). Assuming the other conditions controlling IR
00100 are not keeping it ON, the work bit IR 22500 will turn IR 00100 ON for
one cycle only.
22500
DIFU(13) 22500
00000
00001 00002 00003
00004 00005
00100
Address Instruction Operands
00000 LD 00000
00001 DIFU(13) 22500
00002 LD 22500
00003 LD 00001
00004 AND NOT 00002
00005 AND NOT 00003
00006 OR LD ---
00007 LD 00004
00008 AND NOT 00005
00009 OR LD ---
00010 OUT 00100
4-9 Programming Precautions
The number of conditions that can be used in series or parallel is unlimited
as long as the memory capacity of the PC is not exceeded. Therefore, use as
many conditions as required to draw a clear diagram. Although very compli-
cated diagrams can be drawn with instruction lines, there must not be any
conditions on lines running vertically between two other instruction lines. Dia-
gram A shown below, for example, is not possible, and should be drawn as
diagram B. Mnemonic code is provided for diagram B only; coding diagram A
would be impossible.
00003
Instruction 2
Instruction 1
0000200000
00001
00004
Diagram A
Instruction 1
00004
00003
00000
00001
Diagram B
00002
Instruction 2
0000400000
00001
Address Instruction Operands
00000 LD 00001
00001 AND 00004
00002 OR 00000
00003 AND 00002
00004 Instruction 1
00005 LD 00000
00006 AND 00004
00007 OR 00001
00008 AND NOT 00003
00009 Instruction 2
Programming Precautions Section 4-9
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