IDEC MicroSmart - Manual (Page 504)

A PPENDIX
A-2 « FC4A M ICRO S MART U SER ’ S M ANUAL »
Note: Operands M, D, I, and Q represent internal relay, data register, input, and output, respectively.
Breakdown of END Processing Time
The END processing time depends on the MicroSmart settings and system configuration. The total of execution times for
applicable conditions shown below is the actual END processing time.
Note 1: Clock function is processed once ever y 500 ms.
Note 2: Data link slave stations are processed in interrupt processing asynchronous to the ordinar y system processing.
I/O Delay Time
In addition to processing user program instructions and END instruction, the MicroSmart system processing includes
interrupt processing of various functions.
The minimum delay from a standard input to a standard output in the program below is 884.1 µs.
The I/O delay time may be increased by such factors as increased END processing time (caused by frequent interrupt pro-
cessing and larger program size) and input filter setting.
BTOA D
→ D
160
ATOB D
→ D
156
ENCO M
→ D 16 bits
92
DECO D
→ M
51
BCNT M
→ D 16 bits
180
ALT 26
LJMP 15
LCAL 20
LRET 7
IOREF
I 52
Q 15
RUNA, STPA 100-byte access 10 ms
Item Condition Execution Time
Housekeeping (built-in I/O service) 640 µs
Expansion I/O service
IN/OUT 8/8 points 260 µs
IN/OUT 16/16 points 340 µs
IN/OUT 32/32 points 720 µs
Clock function processing (Note 1) 850 µs
Data link master station processing
(Note 2)
When using a data link system
4.2 + 2.4
× transmit/receive words ms
(at 19200 bps)
See page 25-10.
Maximum execution time
LOD 1.0 µs
OUT 3.1 µs
END processing time (without interrupt processing) Housekeeping 640 µs
Input delay time (DC input without filter setting) 40 µs
Output delay time (transistor output) Approx. 200 µs
Instruction Operand and Condition Execution Time (µs) Note
I0
Instruction Data
LOD
OUT I0
Q0
Q0