Allen-Bradley MicroLogix 1400 User Manual

Publication 1766-RM001A-EN-P - October 2008
232 Math Instructions
Use the XPY instruction to raise a value (source A) to a power (source B)
and store the result in the destination. If the value in source A is negative,
the exponent (source B) should be a whole number. If it is not a whole
number, the overflow bit is set and the absolute value of the base is used
in the calculation
Enter the following parameters when programming this instruction:
• Source A is a value of base to power
• Source B is a value or address to compute exponent
• Destination is the address to store the result of computation
Address Levels for the operands involved in the XPY 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.
Instruction Operation
When the rung is true, this instruction shall compute the Source A to
power Source B and place the result in Destination.
If the Destination is floating point, the result shall always be rounded
using the round to even rule.
XPY 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 A/B•• •••• • • • • • •• •
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

Brand	Allen-Bradley
Model	MicroLogix 1400
Category	Controller
Language	English