Rockwell-automation 1761 MicroLogix 1000 Programmable Controllers Manual de usuario descargar pdf (Pagina 128)

100

101

Preface

MicroLogix 1000 Programmable Controllers User Manual

7–6

Limit

est (LIM)

Use the LIM instruction to test for values within or outside a specified range,

depending on how you set the limits.

Entering Parameters

The Low Limit, T

est, and High Limit values can be word addresses or constants,

restricted to the following combinations:

• If the Test parameter is a constant, both the Low Limit and High Limit

parameters must be word addresses.

• If the Test parameter is a word address, the Low Limit and High Limit

parameters can be either a constant or a word address.

True/False Status of the Instruction

If the Low Limit has a value equal to or less than the High Limit, the instruction is

true when the Test value is between the limits or is equal to either limit. If the Test

value is outside the limits, the instruction is false, as shown below

Example, low limit less than high limit:

Low

Limit

High

Limit

Instruction is True

when Test value is

Instruction is False

when Test value is

5 8 5 through 8 –32,768 through 4 and 9 through 32,767

False True False

–32,768

Low Limit

High Limit

+ 32,767

Execution Times

(µsec) when:

True False

36.93 7.69

LIM

LIMIT TEST

Low Lim

Test

High Lim

1 2 ... 123 124 125 126 127 128 129 130 131 132 133 ... 421 422

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