Allen-Bradley MicroLogix 1000 User Manual

Name: Allen-Bradley MicroLogix 1000
Brand: Allen-Bradley
Rating: 4 (1 reviews)

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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

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