Controlling Bit Status; Set And Reset - Omron CPM1 Programming Manual

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Controlling Bit Status

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SET and RESET

The other type of jump is created with a jump number of 00. As many jumps as
desired can be created using jump number 00 and JUMP instructions using 00
can be used consecutively without a JUMP END using 00 between them. It is
even possible for all JUMP 00 instructions to move program execution to the
same JUMP END 00, i.e., only one JUMP END 00 instruction is required for all
JUMP 00 instruction in the program. When 00 is used as the jump number for a
JUMP instruction, program execution moves to the instruction following the next
JUMP END instruction with a jump number of 00. Although, as in all jumps, no
status is changed and no instructions are executed between the JUMP 00 and
JUMP END 00 instructions, the program must search for the next JUMP END 00
instruction, producing a slightly longer execution time.
Execution of programs containing multiple JUMP 00 instructions for one JUMP
END 00 instruction is similar to that of interlocked sections. The following dia-
gram is the same as that used for the interlock example above, except redrawn
with jumps. The execution of this diagram would differ from that of the diagram
described above (e.g., in the previous diagram interlocks would reset certain
parts of the interlocked section, however, jumps do not affect the status of any bit
between the JUMP and JUMP END instructions).
JMP(04) 00
Instruction 1
JMP(04) 00
Instruction 2
Instruction 3
Instruction 4
JME(05) 00
There are seven basic instructions that can be used generally to control individu-
al bit status. These are the OUTPUT, OUTPUT NOT, SET, RESET, DIFFER-
ENTIATE UP, DIFFERENTIATE DOWN, and KEEP instructions. All of these
instructions appear as the last instruction in an instruction line and take a bit ad-
dress for an operand. Although details are provided in 7-8 Bit Control Instruc-
tions , these instructions (except for OUTPUT and OUTPUT NOT, which have
already been introduced) are described here because of their importance in
most programs. Although these instructions are used to turn ON and OFF output
bits in the IR area (i.e., to send or stop output signals to external devices), they
are also used to control the status of other bits in the IR area or in other data
areas.
The SET and RESET instructions are very similar to the OUTPUT and OUTPUT
NOT instructions except that they only change the status of their operand bits for
ON execution conditions. Neither instructions will affect the status of its operand
bit when the execution condition is OFF.
Section
Address Instruction Operands
00000 LD
00001 JMP(04)
00002 LD
00003 Instruction 1
00004 LD
00005 JMP(04)
00006 LD
00007 AND NOT
00008 Instruction 2
00009 LD
00010 Instruction 3
00011 LD
00012 Instruction 4
00013 JME(05)
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