Rockwell-automation 1761 MicroLogix 1000 Programmable Controllers Manual de usuario descargar pdf (Pagina 107)

100

101

Using Basic Instructions

6–9

Timer Accuracy

Timer accuracy refers to the length of time between the moment a timer instruction

is enabled and the moment the timed interval is complete.

Timing accuracy is –0.01 to +

0 seconds, with a program scan of up to 2.5 seconds.

The 1-second timer maintains accuracy with a program scan of up to 1.5 seconds. If

your programs can exceed 1.5 or 2.5 seconds, repeat the timer instruction rung so

that the rung is scanned within these limits.

Note Timing could be inaccurate if Jump (JMP), Label (LBL), Jump to Subroutine (JSR),

or Subr

outine (SBR) instructions skip over the rung containing a timer instruction

while the timer is timing. If the skip duration is within 2.5 seconds, no time will be

lost; if the skip duration exceeds 2.5 seconds, an undetectable timing err

or occurs.

When using subr

outines, a timer must be executed at least every 2.5 seconds to

event a timing err

or.

Addressing Structure

Address bits and words using the format Tf:e.s/b

Format Explanation

T Timer file

f File number. The only valid file number is 4.

: Element delimiter

f:e

Element

number

Ranges from 0 – 39. These are 3-word elements. See figure on

page 6–8.

f:e

. Word element

s subelement

/ Delimiter

b bit

Programming

1 2 ... 102 103 104 105 106 107 108 109 110 111 112 ... 421 422

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