UCMP

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	✓	✓	✓	✓	✓	✓	✓	✓	–	✓	✓	✓	✓	✓	✓

Supported Flags

Flag	Bit	Support
Error	F11.0	✓
Zero	F11.1	–
Carry	F11.2	–

Number of Steps

Steps
3

Operands

Operand	Description
S1	The first operand. Entries are unsigned WORD data registers or constants. The unsigned value range is 0 ~ 65,535 (216-1). The Hexadecimal value range is H0000 ~ HFFFF. Only unsigned or Hexadecimal values will be compared.
S2	The second operand. Entries are unsigned WORD data registers or constants. The unsigned value range is 0 ~ 65,535 (216-1). The Hexadecimal value range is H0000 ~ HFFFF. Only unsigned or Hexadecimal values will be compared.

Notice

Comparison	Operator	Flag	Comparison Range
Less Than	S1 \< S2	F12.0	0 ~ 65,535
Less Than Equal To	S1 ≤ S2	F12.1	0 ~ 65,535
Equal	S1 = S2	F12.2	0 ~ 65,535
Greater Than	S1 > S2	F12.3	0 ~ 65,535
Greater Than Equal To	S1 ≥ S2	F12.4	0 ~ 65,535
Not Equal	S1 ≠ S2	F12.5	0 ~ 65,535

Ladder Diagram Examples

Less Than (\<)

Comparison	Operator	Flag	Comparison Range
Less Than	S1 \< S2	F12.0	0 ~ 65,535

The UCMP instruction compares a WORD value, S1, to another WORD value, S2, and is true if S1 is less than S2. If S1 is less than S2, the BOOL flag F12.0 is true, and the output is energized.

If the contact, M0.0, is powered ON (1) and the expression, D40 < D42 (6,500 < 6,000) is FALSE, the less than flag, F12.0, is deenergized. As a result, the coil, Y0.0, is deenergized.

If the contact, M0.0, is powered ON (1) and the expression, D40 < D42 (5,500 < 6,000) is TRUE, the less than flag, F12.0, is energized. As a result, the coil, Y0.0, is energized.

Memory Monitor

Notice

Less Than Equal To (≤)

Comparison	Operator	Flag	Comparison Range
Less Than Equal To	S1 ≤ S2	F12.1	0 ~ 65,535

The UCMP instruction compares a WORD value, S1, to another WORD value, S2, and is true if S1 is less than or equal to S2. If S1 is less than or equal to S2, the BOOL flag F12.1 is true, and the output is energized.

If the contact, M0.0, is powered ON (1) and the expression, D41 ≤ D43 (5,432 ≤ 4,321) is FALSE, the less than flag, F12.1, is deenergized. As a result, the coil, Y1.0, is deenergized.

If the contact, M0.0, is powered ON (1) and the expression, D41 ≤ D43 (54,321 ≤ 65,432) is TRUE, the less than flag, F12.1, is energized. As a result, the coil, Y1.0, is energized.

Memory Monitor

Notice

Equal (=)

Comparison	Operator	Flag	Comparison Range
Equal	S1 = S2	F12.2	0 ~ 65,535

The UCMP instruction compares a WORD value, S1, to another WORD value, S2, and is true if S1 is equal to S2. If S1 is equal to S2, the BOOL flag F12.2 is true, and the output is energized.

If the contact, M0.0, is powered ON (1) and the expression, D50 ≠ D52 (12,542 ≠ 3,214) is FALSE, the less than flag, F12.2, is deenergized. As a result, the coil, Y2.0, is deenergized.

If the contact, M0.0, is powered ON (1) and the expression, D50 = D52 (12,345 = 12,345) is TRUE, the less than flag, F12.2, is energized. As a result, the coil, Y2.0, is energized.

Memory Monitor

Notice

Greater Than (>)

Comparison	Operator	Flag	Comparison Range
Greater Than	S1 > S2	F12.3	0 ~ 65,535

The UCMP instruction compares a WORD value, S1, to another WORD value, S2, and is true if S1 is greater than S2. If S1 is greater than S2, the BOOL flag F12.3 is true, and the output is energized.

D60 (46,133 > 55,000) is FALSE, the less than flag, F12.3, is deenergized.”/>

If the contact, M0.0, is powered ON (1) and the expression, D58 > D60 (46,133 > 55,000) is FALSE, the less than flag, F12.3, is deenergized. As a result, the coil, Y3.0, is deenergized.

D60 (59,000 > 55,000) is TRUE, the less than flag, F12.3, is energized.”/>

If the contact, M0.0, is powered ON (1) and the expression, D58 > D60 (59,000 > 55,000) is TRUE, the less than flag, F12.3, is energized. As a result, the coil, Y3.0, is energized.

Memory Monitor

Notice

Greater Than Equal To (≥)

Comparison	Operator	Flag	Comparison Range
Greater Than Equal To	S1 ≥ S2	F12.4	0 ~ 65,535

The UCMP instruction compares a WORD value, S1, to another WORD value, S2, and is true if S1 is greater than or equal to S2. If S1 is greater than or equal to S2, the BOOL flag F12.4 is true, and the output is energized.

If the contact, M0.0, is powered ON (1) and the expression, D66 ≥ D68 (8,463 ≥ 10,532) is FALSE, the less than flag, F12.4, is deenergized. As a result, the coil, Y4.0, is deenergized.

If the contact, M0.0, is powered ON (1) and the expression, D66 ≥ D68 (15,555 ≥ 10,532) is TRUE, the less than flag, F12.4, is energized. As a result, the coil, Y4.0, is energized.

Memory Monitor

Notice

Not Equal (≠)

Comparison	Operator	Flag	Comparison Range
Not Equal	S1 ≠ S2	F12.5	0 ~ 65,535

The UCMP instruction compares a WORD value, S1, to another WORD value, S2, and is true if S1 is not equal to S2. If S1 is not equal to S2, the BOOL flag F12.5 is true, and the output is energized.

If the contact, M0.0, is powered ON (1) and the expression, D74 = D76 (54,321 = 54,321) is FALSE, the less than flag, F12.5, is deenergized. As a result, the coil, Y5.0, is deenergized.

If the contact, M0.0, is powered ON (1) and the expression, D74 ≠ D76 (45,612 ≠ 54,321) is TRUE, the less than flag, F12.5, is energized. As a result, the coil, Y5.0, is energized.

Memory Monitor

Notice