Allen-Bradley MicroLogix 1400 User Manual

Publication 1766-RM001A-EN-P - October 2008
Math Instructions 221
Instruction Operation
When the rung is true, this instruction shall compute arc cosine of the
Source and place the result in Destination. Valid input range is from
-1.0…1.0 and output range is from 0…π.
If the Destination is floating point, the result shall always be rounded
using the round to even rule.
ATN - Arc Tangent
Instruction Type: output
ACS 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 -1.0 <= Source < 1.0 0,0,0,0 L Acos(Source)
W,DW, F F X Source= 1.0 0,1,0,0 L 0
(1)
DNRM F X X 0,0,0,0 L
π/2
W,DW, F W, DW X Acos(Source) >= 0.5 0,0,0,0 L Rnd(Acos(Source))
W,DW, F W, DW X Acos(Source) < 0.5 0,1,0,0 L 0
(2)
X F X Source < -1 or Source > 1 0,0,1,0 1 0x7FFFFFFF
(2)
X F X Source is NAN or INF 0,0,1,0 1 0x7FFFFFFF
X W X Source < -1 or Source > 1 0,0,1,0 1 32767
X DW X Source < -1 or Source > 1 0,0,1,0 1 2147483647
(3)
X W X Source is NAN or INF 0,0,1,0 1 32767
(3)
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 π/2.
(2) If the Destination is floating point, all overflows shall produce NAN(0x7FFFFFFF).
(3) If the Destination is word or double-word, and an overflow occurs, destination shall be 32767 for Word and 2147483647 for Double Word.
ABS
Arc Tangent
Source N7:0
0<
Dest N7:1
0<
ATN
Execution Time for the ATN Instruction
Controller Data Size When Rung Is:
True False
MicroLogix 1400 word 146.7510 µs 0.3740 µs
long word 146.4885 µs 0.4088 µs
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Allen-Bradley MicroLogix 1400 Specifications

General

Brand	Allen-Bradley
Model	MicroLogix 1400
Category	Controller
Language	English