Exponentiation (REAL)

Instruction Parameters

Supported PLC Series

XPnA/1R	XPnB	XPnE	XPnF	CP3A/B/P/U CP4A~D/U	CPnE	CPnF	BP	PLC-S
✓	✓	✓	✓	-	-	-	-	✓

Supported Data Registers

	M	X	Y	K	L	F	T	C	S	Z	R	Q	D	@D	Constant
S1	✓	✓	✓	✓	✓	✓	✓	✓	-	✓	✓	✓	✓	✓	✓
S2	✓	✓	✓	✓	✓	✓	✓	✓	-	✓	✓	✓	✓	✓	✓
D	✓	-	✓	✓	✓	-	✓	✓	-	✓	✓	✓	✓	✓	-

Supported Flags

Flag	Bit	Support
Error	F11.0	✓
Zero	F11.1	-
Carry	F11.2	-

Number of Steps

Steps
4

Operands

Operand	Description
S1	The first operand. Entries are REAL data registers or constants. This is the base. The value range is 2-127 ~ 2128 (-1.7014118e+38 ~ 3.4028237e+38).
S2	The second operand. Entries are REAL data registers or constants. This is the exponent. The value range is 2-127 ~ 2128 (-1.7014118e+38 ~ 3.4028237e+38).
D	The third operand. Entries are only REAL data registers. This is where the power is saved.

Float Representation

Mantissa	Exponent	Sign
Bit 0 ~ Bit 22	Bit 23 ~ Bit 30	Bit 31

Notice

Error Flag (F11.0) Notice

The error flag, F11.0, will be ON for one scan when the address of the data register assigned by @D exceeds the range of the data register, D. The range of the data register, D, is dependent on the CPU type.

F11.0 turns ON when the value of the data for exponentiation exceeds the data register assigned to S1 or S2.

Instruction Behavior

The value range for the assigned REAL data register, D, is 2^-127 ~ 2¹²⁸ (5.8774718e-39 ~ 3.4028237e+38).

• If the exponentiation result is greater than 2¹²⁸ (3.4028237e+38):
  • The final result will be 1.#INF00 (infinity).
• If the exponentiation result is less than 2^-127:
  • The final result will be 0.00000000.
• If the value of the base, S1 is negative and the value of the exponent is a non-integer number:
  • The final result will be 1.#QNAN0 (Quite Not-a-Number)

Tip: Operand Exponentiation Format

S1 raised to the power of S2.
(S1^S2)

Examples

• Ladder Diagram