Allen-Bradley MicroLogix 1400 Instruction Manual page 234

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232 Math Instructions
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.
Data Files
Parameter
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.
Publication 1766-RM001A-EN-P - October 2008
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.
Function Files
• • •
• • •
You cannot use indirect addressing with: S, MG, PD, RTC, HSC, PTOX,
IMPORTANT
PWMX, STI, EII, BHI, MMI, CS, IOS, and DLS files.
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.
(1)
Address Mode
• • •
• •
(3)
Address Level
• • •
• • •