Instruction Parameters
Supported PLC Series
| PLC-AES | PLC-FB | PLC-ES |
|---|---|---|
| ✓ | ✓ | ✓ |
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. (S1S2)
Ladder Diagram Examples
EPWR
The EPWR instruction raises the base REAL value, S1, to the exponent REAL value, S2, and saves the power in an assigned REAL data register, D.
When the contact, M0.5, is powered ON, the REAL data register, D15, is raised to the power of the REAL data register, D17, and the power is saved in the REAL data register, D19.
Memory Monitor
EPWRP
The EPWRP one-shot instruction raises the base REAL value, S1, to the exponent REAL value, S2, and saves the power in an assigned REAL data register, D. Every time this instruction executes, it energizes the output only once.
When the contact, M0.5, is powered ON, the REAL data register, D15, is raised to the power of the REAL data register, D17, and the power is saved in the REAL data register, D19.
Memory Monitor
