Rockwell-automation 1761 MicroLogix 1000 Programmable Controllers Manual de usuario descargar pdf (Pagina 170)

100

101

Preface

MicroLogix 1000 Programmable Controllers User Manual

9–22

Negate (NEG)

Use the NEG instruction to change the sign of a value. If you negate a negative

value, the result is a positive; if you negate a positive value, the result is a negative.

The destination contains the two’s complement of the source.

The source and destination must be word addresses.

Updates to Arithmetic Status Bits

With this Bit: The Controller:

S:0/0 Carry (C) clears if 0 or overflow, otherwise sets.

S:0/1 Overflow (V)

sets if overflow, otherwise reset. Overflow occurs only if

–32,768 is the source. On overflow, the minor error flag is also

set. The value 32,767 is placed in the destination. If S:2/14 is

set, then the unsigned, truncated overflow remains in the

destination.

S:0/2 Zero (Z) sets if result is zero; otherwise resets.

S:0/3 Sign (S) sets if result is negative; otherwise resets.

Execution Times

(µsec) when:

True False

29.48 6.78

NEG

NEGATE

Source

Dest

1 2 ... 165 166 167 168 169 170 171 172 173 174 175 ... 421 422

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