User guide

Chapter 15
Instruction Set Overview
15–5
Math Instructions – Chapter 20
Instruction Name
and Mnemonic
5/02
Only
•
Function – Output Instructions
Add ADD When rung conditions are true, the ADD instruction
adds source A to source B and stores the result in the
destination.
Subtract SUB When rung conditions are true, the SUB instruction
subtracts source B from source A and stores the result
in the destination.
Multiply MUL When rung conditions are true, the MUL instruction
multiplies source A by source B and stores the result in
the destination.
Divide DIV When rung conditions are true, the DIV instruction
divides source A by source B and stores the result in
the destination and the math register.
Double Divide DDV When rung conditions are true, the DDV instruction
divides the contents of the math register by the source
and stores the result in the destination and the math
register.
Negate NEG When rung conditions are true, the NEG instruction
subtracts the source from zero and stores the result in
the destination.
Clear CLR When rung conditions are true, the CLR instruction
clears the destination to zero.
Convert to BCD TOD When rung conditions are true, the TOD instruction
converts the source value to BCD and stores it in the
math register or the destination file of the SLC 5/02.
Convert from BCD FRD When rung conditions are true, the FRD instruction
converts a BCD value in the math register or the source
file of the SLC 5/02 to an integer, and stores it in the
destination.
Decode DCD When rung conditions are true, the DCD instruction
decodes 4-bit value (0 to 16), turning on the
corresponding bit in 16-bit destination.
Square Root SQR
•
When rung conditions are true, the SQR instruction
calculates the square root of the source and places the
rounded result in the destination.
Scale SCL
•
When rung conditions are true, the SCL instruction
multiplies the source by a specified rate. The result is
added to an offset value and placed in the destination.