Rockwell-automation 1761 MicroLogix 1000 Programmable Controllers Manual de usuario descargar pdf (Pagina 136)

100

101

Preface

MicroLogix 1000 Programmable Controllers User Manual

8–4

Add (ADD)

Use the ADD instruction to add one value (source A) to another value (source B)

and place the result in the destination. Source A and B can either be a word address

or constant.

Updates to Arithmetic Status Bits

With this Bit: The Controller:

S:0/0 Carry (C) sets if carry is generated; otherwise resets.

S:0/1 Overflow (V)

sets if overflow is detected at destination; otherwise resets.

On overflow, the minor error flag is also set. The value

–32,768 or 32,767 is placed in the destination. If S:2/14 (math

overflow selection bit) 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

33.09 6.78

ADD

Source A

Source B

Dest

1 2 ... 131 132 133 134 135 136 137 138 139 140 141 ... 421 422

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