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 8-digit binary-coded decimal (BCD) data registers or constants. This is the value to square root. The value range is H0000 ~ H9999. |
| D | The second operand. Entries are only 8-digit binary-coded decimal (BCD) data registers. This is where the square root is saved. |
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, Infinity (1.#INF00), is stored in the data register D.
Instruction Behavior
The BDSQR and BDSQRP instructions behave as follows:
- The value of S can only be a positive number.
- Bit 31 of S must always be 0.
- The square root result is rounded off from the fifth decimal place.
Ladder Diagram Examples
BDSQR
The BDSQR instruction calculates the square root of the 8-digit binary coded decimal (BCD) value, S, and saves the result in an assigned 8-digit binary coded decimal (BCD) data register, D.
When the contact, M1.5, is ON (1), the instruction takes the square root of the value, H00547813, into the resulting radian value, H14390740.
Memory Monitor
BDSQRP
The BDSQRP one-shot instruction calculates the square root of the 8-digit binary coded decimal (BCD) value, S, and saves the result in an assigned 8-digit binary coded decimal (BCD) data register, D. Every time this instruction executes, it energizes the output only once.
When the contact, M1.6, is ON (1), the instruction takes the square root of the value, H09784312, into the resulting radian value, H98843127.
Memory Monitor
