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Auxiliary Area Allocations Appendix D
FQM1 Instruction Execution Times and Number of Steps
The following table lists the execution times for all instructions that are available for the FQM1.
The total execution time of instructions within one whole user program is the process time for program execu-
tion when calculating the cycle time. (See note.)
Note User programs are allocated tasks that can be executed within cyclic tasks and interrupt tasks that sat-
isfy interrupt conditions.
Execution times for most instructions differ depending on the conditions when the instruction is executed. The
execution time can also vary when the execution condition is OFF.
The following table also lists the length of each instruction in the Length (steps) column. The number of steps
required in the user program area for each of the instructions varies from 1 to 7 steps, depending upon the
instruction and the operands used with it. The number of steps in a program is not the same as the number of
instructions.
Note (1) Program capacity for the FQM1 is measured in steps. Basically speaking, 1 step is equivalent to 1
word.
Most instructions are supported in differentiated form (indicated with
↑, ↓, @, and %). Specifying
differentiation will increase the execution times by the following amounts.
(2) Use the following time as a guideline when instructions are not executed.
Approx. 0.2 to 0.5
µs
Sequence Input Instructions
Note When a double-length operand is used, add 1 to the value shown in the length column in the above
table.
Sequence Output Instructions
Symbol µs
↑ or ↓ +0.5
@ or % +0.5
Instruction Mnemonic Code Length
(steps)
(See
note.)
ON execution
time (
µs)
Hardware
implementation
Conditions
LOAD LD --- 1 0.10 Yes ---
LOAD NOT LD NOT --- 1 0.10 Yes ---
AND AND --- 1 0.10 Yes ---
AND NOT AND NOT --- 1 0.10 Yes ---
OR OR --- 1 0.10 Yes ---
OR NOT OR NOT --- 1 0.10 Yes ---
AND LOAD AND LD --- 1 0.05 Yes ---
OR LOAD OR LD --- 1 0.05 Yes ---
Instruction Mnemonic Code Length
(steps)
(See
note.)
ON execution
time (
µs)
Hardware
implementation
Conditions
OUTPUT OUT --- 1 0.35 Yes ---
OUTPUT NOT OUT NOT --- 1 0.35 Yes ---
KEEP KEEP 011 1 0.40 Yes ---
DIFFERENTIATE UP DIFU 013 2 0.50 Yes ---
DIFFERENTIATE
DOWN
DIFD 014 2 0.50 Yes ---
SET SET --- 1 0.30 Yes ---
RESET RSET --- 1 0.30 Yes ---