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Publication 1766-RM001A-EN-P - October 2008

Math Instructions 231

XPY - X Power Y

Instruction Type: output

LOG Instruction Operation

Inputs Conditions Output

Source Type Destination

Type

S:2/14 S:0/3-0

S, Z, V, C

S:5/0 Destination

W,DW, F F X Source > 1 0,0,0,0 L Log(Source)

W,DW, F F X Source = 1 0,1,0,0 L 0

W,DW, F F X 0 < Source < 1 1,0,0,0 L Log(Source)

W,DW, F W, DW X Source >= Sqrt(10) 0,0,0,0 L Rnd(Log(Source))

W,DW, F W, DW X 1/Sqrt(10) < Source < Sqrt(10) 0,1,0,0 L 0

W,DW, F W, DW X 0 < Source <= 1/Sqrt(10) 1,0,0,0 L Rnd(Log(Source))

(1)

+DNRM F X X 1,0,1,0 1 -INF

(1)

(2)

+DNRM W 0 X 1,0,1,0 1 -32768

(1)

(2)

+DNRM DW 0 X 1,0,1,0 1 -2147483648

(1)

(3)

W,DW, F F X Source <= 0 (including -DNRM) 0,0,1,0 1 0x7FFFFFFF

(2)

W,DW, F F X Source = +INF 0,0,1,0 1 +INF

(3)

X F X Source is NAN or -INF 0,0,1,0 1 0x7FFFFFFF

(4)

X W 0 Source is NAN or INF 0,0,1,0 1 32767

(4)

X DW 0 Source is NAN or INF 0,0,1,0 1 2147483647

(1) All denormalized inputs shall be treated as plus zero.

(2) If the Destination is word or double-word and an overflow occurs (except source is NAN or INF), destination is -32768 for Word and -2147483648 for Double Word.

(3) If the Destination is floating point, all overflows (except +INF) shall produce NAN (0x7FFFFFFF).

(4) If Destination is an integer and the Source is NAN or infinity (+INF or -INF), a saturated result (32767 for Word and 2147483647 for Double Word) shall be stored.

ABS

X To Power of Y

Source A N7:0

Source B N7:1

Dest N7:2

XPY

Execution Time for the XPY Instruction

Controller Data Size When Rung Is:

True False

MicroLogix 1400 word 66.2050 µs 0.3920 µs

long word 69.0550 µs 0.3548 µs

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