Allen-Bradley MicroLogix 1400 User Manual

Publication 1766-RM001A-EN-P - October 2008
220 Math Instructions
ACS - Arc Cosine
Instruction Type: output
Use the ACS instruction to take the arc cosine of a number (source in
radians) and store the result (in radians) in the destination. The source
must be greater than or equal to -1 and less than or equal to 1. The
resulting value in the destination is always greater than or equal to 0 and
less than or equal to π, where π = 3.141592.
Enter the following parameters when programming this instruction:
• Source is the address to compute the arc cosine.
• Destination is the address to store the arc cosine of the Source.
Address Levels for the operands involved in the ACS can be ALL word,
ALL double word, ALL float, or a combination. These operands shall
undergo a conversion to float. The calculation of the source (in float) is
then performed, and the result is then cast to the data type of Destination.
ABS
Arc Cosine
Source N7:0
0<
Dest N7:1
0<
ACS
Execution Time for the ACS Instruction
Controller Data Size When Rung Is:
True False
MicroLogix 1400 word 18.0150 µs 0.3750 µs
long word 18.3070 µs 0.4150 µs
ACS Instruction Valid Addressing Modes and File Types
For definitions of the terms used in this table see Using the Instruction Descriptions on page 92.
Parameter
Data Files
Function Files
(1)
CS - Comms IOS - I/O DLS - Data Log
(2)
Address Mode
(3)
Address Level
O I S B T, C, R N F ST L MG, PD RI/RIX PLS RTC HSC PTOX, PWMX STI EII BHI MMI LCD Direct Indirect Immediate Int16 Immediate Int32 Immediate Float Bit Word Double Word Element Float
Source •• •••• • • • • • • • ••••
Destination • • • • • • • •
• • •• •
(1) PTOX and PWMX files are only for use with MicroLogix 1400 BXB or BXBA unit.
(2) The Data Log Status file can only be used for the following math instructions: ADD, SUB, MUL, DIV, NEG, and SCP.
(3) See Important note about indirect addressing.
IMPORTANT
You cannot use indirect addressing with: S, MG, PD, RTC, HSC, PTOX,
PWMX, STI, EII, BHI, MMI, CS, IOS, and DLS files.
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Allen-Bradley MicroLogix 1400 Specifications

General

Processor	32-bit
Expansion Modules	Up to 7 expansion I/O modules
Power Supply	24V DC or 120/240V AC
Programming Software	RSLogix 500
Communication Ports	Ethernet, RS-232/RS-485 combo port
Controller Type	Programmable Logic Controller (PLC)
Series	MicroLogix
Digital Outputs	12
Analog Inputs	6 (embedded)
Analog Outputs	2 (embedded)
High-Speed Counter	6 high-speed counters
Pulse Output	2 (embedded)
Ethernet Port	Yes