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Publication 1766-RM001A-EN-P - October 2008

Math Instructions 227

LN - Natural Log

Instruction Type: output

RAD 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 >= 0 0,0,0,0 L Rad(Source)

(1)

DNRM F X X 0,1,0,0 L 0

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

W,DW, F W X -0.5 <= Rad(Source) < 32767.5 0,0,0,0 L Rnd(Rad(Source))

W,DW, F W X -0.5 < Rad(Source) < 0.5 0,1,0,0 L 0

W,DW, F W X -32768.5 < Rad(Source) <= -0.5 1,0,0,0 L Rnd(Rad(Source))

W,DW, F DW X 0.5 <= Rad(Source) < 2147483647.5 0,0,0,0 L Rnd(Rad(Source))

W,DW, F DW X -0.5 < Rad(Source) < 0.5 0,1,0,0 L 0

W,DW, F DW X -2147483648.5 < Rad(Source) <= -0.5 1,0,0,0 L Rnd(Rad(Source))

(2)

W,DW, F W X Rad(Source) >= 32767.5 0,0,1,0 1 32767

(2)

W,DW, F W X Rad(Source) <= 32767.5 1,0,1,0 1 -32768

(2)

W,DW, F DW X Rad(Source) >= 2147483647.5 0,0,1,0 1 2147483647

(2)

W,DW, F DW X Rad(Source) <= -2147483648.5 1,0,1,0 1 -2147483648

(3)

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

(4)

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

(4)

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

(1) All denormalized inputs shall be treated as plus zero. Any underflow result shall produce plus zero.

(2) If the Destination is word or double-word and an overflow occurs(except source is NAN or INF):

If the result is positive, Destination is 32767 for Word and 2147483647 for Double Word. If the result is negative, Destination is -32768 for Word and -2147483648 for

Double Word.

(3) If the Destination is floating point, all overflows (Source is NAN or infinity) shall produce NAN (0x7FFFFFFF).

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

ABS

Natural Log

Source N7:0

Dest N7:1

Execution Time for the LN Instruction

Controller Data Size When Rung Is:

True False

MicroLogix 1400 word 127.3260 µs 0.4094 µs

long word 130.3635 µs 0.4094 µs

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