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 | ✓ | – | ✓ | ✓ | ✓ | – | – | – | – | ✓ | ✓ | ✓ | ✓ | ✓ | – |
| B | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | – | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| n | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | – | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
Supported Flags
| Flag | Bit | Support |
|---|---|---|
| Error | F11.0 | ✓ |
| Zero | F11.1 | – |
| Carry | F11.2 | – |
Number of Steps
| Steps |
|---|
| 6 |
Operands
| Operand | Description |
|---|---|
| S1 | The first operand. Entries are WORD data registers or constants. This is the starting data register for the first range of n data registers to compare to S2. This requires n data registers. The signed value range is -32,768 ~ 32,767 (216). The Hexadecimal value range is H0000 ~ HFFFF. |
| S2 | The second operand. Entries are only WORD data registers. This is the starting data register for the second range of n data registers to compare to S1. This requires n data registers. The signed value range is -32,768 ~ 32,767 (216). The Hexadecimal value range is H0000 ~ HFFFF. |
| D | The third operand. Entries are only WORD data registers. This is where the comparison result is saved. This could require more than 1 WORD data register. |
| B | The fourth operand. Entries are BOOL data registers or constants. This is the starting bit address to save the comparison results to. |
| n | The fifth operand. Entries are WORD data registers or constants. This is the amount of data registers to compare starting at S1 and S2. |
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.
Ladder Diagram Examples
BK=
The BK= instruction compares n number of WORD data registers starting at S1 to n number of WORD data registers starting at S2. For each data register in the range S1 ~ Sn and S2 ~ Sn that are equal in value, the corresponding bit in the data register D, starting at bit number B, will turn ON (1).
- The BK= instruction will compare the following expressions for a true or false value:
- D0 = D5 → 500 = 500
- D1 = D6 → -250 = -250
- D2 = D7 → -7,800 = -7,800
- When the open contact, M0.0, is powered ON (1), the values of the data registers are compared.
- D0 = D5 → 500 = 500 (TRUE → D10.2 = 1)
- D1 = D6 → -250 = -250 (FALSE → D10.3 = 0)
- D2 = D7 → -7,800 = -7,800 (TRUE → D10.4 = 1)
Memory Monitor
BK=P
The BK=P one-shot instruction compares n number of WORD data registers starting at S1 to n number of WORD data registers starting at S2. For each data register in the range S1 ~ Sn and S2 ~ Sn that are equal in value, the corresponding bit in the data register D, starting at bit number B, will turn ON (1). Every time this instruction executes, it energizes the output only once.
- The BK=P instruction will compare the following expressions for a true or false value:
- D15 = D18 → -5,000 = -5,000
- D16 = D19 → 23,102 = 20,130
- When the open contact, M0.1, is powered ON (1), the values of the data registers are compared.
- D15 = D18 → -5,000 = -5,000 (TRUE → D21.3 = 1)
- D16 = D19 → 23,102 = 20,130 (FALSE → D21.4 = 0)
Memory Monitor
