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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| S | ✓ | ✓ | ✓ | ✓ | ✓ | – | – | – | – | ✓ | – | ✓ | ✓ | ✓ | ✓ |
| D | ✓ | – | ✓ | ✓ | ✓ | – | – | – | – | ✓ | – | ✓ | ✓ | ✓ | – |
Supported Flags
| Flag | Bit | Support |
|---|---|---|
| Error | F11.0 | ✓ |
| Zero | F11.1 | – |
| Carry | F11.2 | – |
Number of Steps
| Steps |
|---|
| 3 |
Operands
| Operand | Description |
|---|---|
| S | The first operand. Entries are COSINE data registers or constants. This is the value to calculate the arccosine value of. The value must be cosine data. The value range is -1 ~ 0.999999 (0 ~ π). |
| D | The second operand. Entries are only REAL data registers. The arccosine is saved as a REAL data register. |
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 the calculation exceeds the data register assigned to S or D. When the value assigned to S exceeds its range, the value, Quite Not-a-Number (-1.#QNAN0), is stored in the data register D.
Instruction Result
The value resulting from the ACOS or ACOSP instruction is saved as a radian. The conversion for radians is: Radians = Degrees × ( π⁄180 )
Ladder Diagram Examples
ACOS Example
The ACOS instruction calculates the arccosine, or inverse cosine, of the COSINE operand, S, and saves the result in an assigned REAL data register, D.
When the contact, M2.0, is ON (1), the instruction executes acos(0.123456) and saves the result, 1.447025.
Memory Monitor
ACOSP
The ACOSP one-shot instruction calculates the arccosine, or inverse cosine, of the COSINE operand, S, and saves the result in an assigned REAL data register, D. Every time this instruction executes, it energizes the output only once.
When the contact, M2.1, is ON (1), the instruction executes acos(0.5) and saves the result, 1.047198.
Memory Monitor
