Omron FQM1-MMP21, FQM1-CM001, FQM1-MMA21 operation manual Programming, Appendix A, Flags, Operands

Programming Appendix A

The following instructions are used in pairs to set and cancel certain instruction conditions. Each pair of instructions must be in the same task.

Instruction	Description	Setting	Canceling
condition		instruction	instruction
Interlocked	An interlock turns OFF part of the program. Special conditions, such as	IL(002)	ILC(003)
	turning OFF output bits, resetting timers, and holding counters, are in
	effect.
Block program	A program block from BPRG(096) to BEND(801) is executed.	BPRG(096)	BEND(801)
execution

Flags

In this context, a flag is a bit that serves as an interface between instructions.

Input flags	Output flags
• Differentiation Flags	• Condition Flags
Differentiation result flags. The status of these flags	Condition Flags include the Always ON/OFF Flags, as well as
are input automatically to the instruction for all dif-	flags that are updated by results of instruction execution. In user
ferentiated up/down output instructions and the	programs, these flags can be specified by labels, such as ER, CY,
DIFU(013)/DIFD(014) instructions.	>, =, A1, A0, rather than by addresses.
• Carry (CY) Flag
The Carry Flag is used as an unspecified operand
in data shift instructions and addition/subtraction
instructions.

Operands

Operands specify preset instruction parameters (boxes in ladder diagrams) that are used to specify I/O mem- ory area contents or constants. An instruction can be executed by entering an address or constant as the oper- ands. Operands are classified as source, destination, or number operands.

Example

MOV

#0000 S (source)

D00000 D (destination)

JMP

3

N (number)

	Operand types	Operand		Description
		symbol
Source	Specifies the address of the data	S	Source operand	Source operand other than control
	to be read or a constant.			data (C)
		C	Control data	Compound data in a source oper-
				and that has different meanings
				depending bit status.
Destination	Specifies the address where data	D	---
(Results)	will be written.
Number	Specifies a particular number used	N	---
	in the instruction, such as a jump
	number or subroutine number.

Note Operands are also called the first operand, second operand, and so on, starting from the top of the instruction.

MOV

#0000 First operand

D00000 Second operand

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