Statement List (STL) - DCE FEL ČVUT v Praze

Floating-Point Math Instructions
8.4.7 TAN Generate the Tangent of Angles as Floating-Point
Numbers (32-Bit)
Format
TAN
Description of instruction
Result
Example
TAN (generate the tangent of angles as floating-point numbers, 32-bit, IEEE-FP)
calculates the tangent of an angle specified as a radian measure. The angle must be
present as a floating-point number in ACCU 1. The result is stored in accumulator 1.
The instruction influences the CC 1, CC 0, OV, and OS status word bits.
The contents of accumulator 2 (and the contents of accumulator 3 and accumulator
4 for CPUs with four ACCUs) remain unchanged.
The result in ACCU 1 is CC 1 CC 0 OV OS Note
+qNaN 1 1 1 1
+infinite 1 0 1 1 Overflow
+normalized 1 0 0 -
+denormalized 0 0 1 1 Underflow
+zero 0 0 0 -
-zero 0 0 0 -
-denormalized 0 0 1 1 Underflow
-normalized 0 1 0 -
-infinite 0 1 1 1 Overflow
-qNaN 1 1 1 1
STL Explanation
L MD10 //The value from memory double word MD10 is loaded into ACCU 1. (This
value must be in the floating-point format.)
TAN //Calculate the tangent of the floating-point number (32-bit, IEEE-FP)
in ACCU 1. Store the result in ACCU 1.
AN OV //Scan the OV bit in the status word for "0."
JC OK //If no error occurred during the TAN instruction, jump to the OK jump
label.
BEU //Block end unconditional, if an error occurred during the TAN
instruction.
OK: T MD20 //Transfer the result from ACCU 1 to memory double word MD20.
Statement List (STL) for S7-300 and S7-400 Programming
8-16 A5E00706960-01