Rockwell-automation 1761 MicroLogix 1000 Programmable Controllers Manual de usuario descargar pdf (Pagina 137)

100

101

Using Math Instructions

8–5

Subtract (SUB)

Use the SUB instruction to subtract one value (Source B) from another (source A)

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 borrow is generated; otherwise resets.

S:0/1 Overflow (V)

sets if underflow; otherwise reset. On underflow, 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.

Programming

Execution Times

(µsec) when:

True False

33.52 6.78

SUB

SUBTRACT

Source A

Source B

Dest

1 2 ... 132 133 134 135 136 137 138 139 140 141 142 ... 421 422

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Rockwell-automation 1761 MicroLogix 1000 Programmable Controllers Manual de usuario Pagina 137

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