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BKCMP< (less than) & BKCMP<P (less than one-shot)

Instruction Parameters

Supported PLC Series

PLC-AESPLC-FBPLC-ES
✓✓✓

Supported Data Registers

MXYKLFTCSZRQD@DConstant
S1✓✓✓✓✓✓✓✓–✓✓✓✓✓✓
S2✓✓✓✓✓✓✓✓–✓✓✓✓✓–
D✓–✓✓✓–✓✓–✓✓✓✓✓–
n✓✓✓✓✓✓✓✓–✓✓✓✓✓✓

Supported Flags

FlagBitSupport
ErrorF11.0✓
ZeroF11.1–
CarryF11.2–

Number of Steps

Steps
5

Operands

OperandDescription
S1The 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 unsigned value range is 0 ~ 65,535 (216).
The Hexadecimal value range is H0000 ~ HFFFF.
S2The 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 unsigned value range is 0 ~ 65,535 (216).
The Hexadecimal value range is H0000 ~ HFFFF.
DThe third operand.
Entries are only WORD data registers.
This is where the comparison result is saved.
This requires n data registers.
nThe fourth 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

BKCMP<

The BKCMP< instruction compares n number of WORD data registers starting at S1 to n number of WORD data registers starting at S2.

The BKCMP< 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 that is less than each data register in the range S2 ~ Sn, each data register in the range D ~ Dn will turn bit 0 to ON (1).

Ladder Diagram Example for MapleLogic LESS/THAN instruction.
The BKCMP< instruction will compare the following expressions for a true or false value:
  • The BKCMP< instruction will compare the following expressions for a true or false value:
    • D25 < D30 → 255 < 355
    • D26 < D31 → 6,523 < 5,432
    • D27 < D32 → -100 < 100
    • D28 < D33 → 32 < -32
When the open contact, M0.2, is powered ON (1), the values of the data registers are compared.
When the open contact, M0.2, is powered ON (1), the values of the data registers are compared.
  • When the open contact, M0.2, is powered ON (1), the values of the data registers are compared.
    • D25 < D30 → 255 < 355 (TRUE → D35 = 1)
    • D26 < D31 → 6,523 < 5,432 (FALSE → D36 = 0)
    • D27 < D32 → -100 < 100 (TRUE → D37 = 1)
    • D28 < D33 → 32 < -32 (FALSE → D38 = 0)

Memory Monitor

Memory Monitor for MapleLogic LESS/THAN instruction.

BKCMP<P

The BKCMP<P one-shot instruction compares n number of WORD data registers starting at S1 to n number of WORD data registers starting at S2.

The BKCMP<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 that is less than each data register in the range S2 ~ Sn, each data register in the range D ~ Dn will turn bit 0 to ON (1). Every time this instruction executes, it energizes the output only once.

Ladder Diagram Example for MapleLogic LESS/THAN instruction.
The BKCMP<P instruction will compare the following expressions for a true or false value:
  • The BKCMP<P instruction will compare the following expressions for a true or false value:
    • D40 < D30 → -4,500 < 4,500
    • D41 < D31 → 6,523 < 7,845
    • D42 < D32 → 500 < 400
    • D43 < D33 → -1,500 < -1,200
    • D44 < D33 → 31,000 < 32,000
When the open contact, M0.3, is powered ON (1), the values of the data registers are compared.
When the open contact, M0.3, is powered ON (1), the values of the data registers are compared.
  • When the open contact, M0.3, is powered ON (1), the values of the data registers are compared.
    • D40 < D30 → -4,500 < 4,500 (TRUE → D52 = 1)
    • D41 < D31 → 6,523 < 7,845 (TRUE → D53 = 1)
    • D42 < D32 → 500 < 400 (FALSE → D54 = 0)
    • D43 < D33 → -1,500 < -1,200 (TRUE → D55 = 1)
    • D44 < D33 → 31,000 < 32,000 (TRUE → D56 = 1)

Memory Monitor

Memory Monitor for MapleLogic LESS/THAN instruction.