Rockwell-automation 1761 MicroLogix 1000 Programmable Controllers Manual de usuario descargar pdf (Pagina 127)

100

101

Using Comparison Instructions

7–5

Masked Comparison for Equal (MEQ)

Use the MEQ instruction to compare data of a source address with data of a

reference address. Use of this instruction allows portions of the data to be masked

by a separate word.

Entering Parameters

•

Source is the address of the value you want to compare.

•

Mask

is the address of the mask through which the instruction moves data. The

mask can be a hexadecimal value (constant).

• Compare is an integer value or the address of the reference.

If the 16 bits of data at the source address are equal to the 16 bits of data at the

compare address (less masked bits), the instruction is true. The instruction becomes

false as soon as it detects a mismatch. Bits in the mask word mask data when reset;

they pass data when set.

Programming

Execution Times

(µsec) when:

True False

28.39 7.69

MEQ

MASKED EQUAL

Source

Mask

Compare

1 2 ... 122 123 124 125 126 127 128 129 130 131 132 ... 421 422

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