Controlling Bit Status; Set And Reset - Omron CQM1H - PROGRAM Programming Manual

Controlling Bit Status

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4-4

Controlling Bit Status

4-4-1

SET and RESET

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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 indi-
vidual bit status. These are the OUTPUT, OUTPUT NOT, SET, RESET, DIF-
FERENTIATE UP, DIFFERENTIATE DOWN, and KEEP instructions. All of
these instructions appear as the last instruction in an instruction line and take
a bit address for an operand. Although details are provided in 5-9 Bit Control
Instructions, 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 OUT-
PUT 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.
SET will turn ON the operand bit when the execution condition goes ON, but
unlike the OUTPUT instruction, SET will not turn OFF the operand bit when
the execution condition goes OFF. RESET will turn OFF the operand bit when
the execution condition goes OFF, but unlike OUTPUT NOT, RESET will not
turn ON the operand bit when the execution condition goes OFF.
In the following example, IR 10000 will be turned ON when IR 00100 goes ON
and will remain ON until IR 00101 goes ON, regardless of the status of IR
00100. When IR 00101 goes ON, RESET will turn IR 10000 OFF.
SET
RSET 10000
Address Instruction
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)
Address Instruction
10000
00000 LD
00001 SET
00002 LD
00003 RSET
Section 4-4
Operands
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Operands
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00101
10000