Example - Ladder Diagram
Less Than (<)
| Comparison | Operator | Flag | Comparison Range |
|---|---|---|---|
| Less Than | S1 < S2 | F12.0 | 0 ~ 4,294,967,295 |
The UDCMP instruction compares a DWORD value, S1, to another DWORD 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.
Ladder Diagram Example
If the contact, M0.1, is powered ON (1) and the expression, D46 < D48 (8,451,238 < 745,128) is FALSE, the less than flag, F12.0 is deenergized.
As a result, the coil, Y0.1, is deenergized.
If the contact, M0.1, is powered ON (1) and the expression, D46 < D48 (647,522 < 745,128) is TRUE, the less than flag, F12.0 is energized.
As a result, the coil, Y0.1, is energized.
Memory Monitor
Notice
A rising-edge (one-shot) or falling-edge (one-shot) contact will NOT energize the output.
Less Than Equal To (≤)
| Comparison | Operator | Flag | Comparison Range |
|---|---|---|---|
| Less Than Equal To | S1 ≤ S2 | F12.1 | 0 ~ 4,294,967,295 |
The UDCMP instruction compares a DWORD value, S1, to another DWORD 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.
Ladder Diagram Example
If the contact, M0.1, is powered ON (1) and the expression, D45 ≤ D47 (824,059 ≤ 653,212) is FALSE, the less than flag, F12.1 is deenergized.
As a result, the coil, Y1.1, is deenergized.
If the contact, M0.1, is powered ON (1) and the expression, D41 ≤ D43 (824,059 ≤ 824,059) is TRUE, the less than flag, F12.1 is energized.
As a result, the coil, Y1.1, is energized.
Memory Monitor
Notice
A rising-edge (one-shot) or falling-edge (one-shot) contact will NOT energize the output.
Equal (=)
| Comparison | Operator | Flag | Comparison Range |
|---|---|---|---|
| Equal | S1 = S2 | F12.2 | 0 ~ 4,294,967,295 |
The UDCMP instruction compares a DWORD value, S1, to another DWORD 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.
Ladder Diagram Example
If the contact, M0.1, is powered ON (1) and the expression, D54 ≠ D56 (97,643,125 ≠ 13,467,985) is FALSE, the less than flag, F12.2 is deenergized.
As a result, the coil, Y2.1, is deenergized.
If the contact, M0.1, is powered ON (1) and the expression, D54 = D56 (13,467,985 = 13,467,985) is TRUE, the less than flag, F12.2 is energized.
As a result, the coil, Y2.1, is energized.
Memory Monitor
Notice
A rising-edge (one-shot) or falling-edge (one-shot) contact will NOT energize the output.
Greater Than (>)
| Comparison | Operator | Flag | Comparison Range |
|---|---|---|---|
| Greater Than | S1 > S2 | F12.3 | 0 ~ 4,294,967,295 |
The UDCMP instruction compares a DWORD value, S1, to another DWORD 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.
Ladder Diagram Example
If the contact, M0.1, is powered ON (1) and the expression, D62 > D64 (12,345,678 > 87,654,321) is FALSE, the less than flag, F12.3 is deenergized.
As a result, the coil, Y3.1, is deenergized.
If the contact, M0.1, is powered ON (1) and the expression, D62 > D64 (87,654,321 > 12,345,678) is TRUE, the less than flag, F12.3 is energized.
As a result, the coil, Y3.1, is energized.
Memory Monitor
Notice
A rising-edge (one-shot) or falling-edge (one-shot) contact will NOT energize the output.
Greater Than Equal To (≥)
| Comparison | Operator | Flag | Comparison Range |
|---|---|---|---|
| Greater Than Equal To | S1 ≥ S2 | F12.4 | 0 ~ 4,294,967,295 |
The UDCMP instruction compares a DWORD value, S1, to another DWORD 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.
Ladder Diagram Example
If the contact, M0.1, is powered ON (1) and the expression, D70 ≥ D72 (45,130 ≥ 65,410) is FALSE, the less than flag, F12.4 is deenergized.
As a result, the coil, Y4.1, is deenergized.
If the contact, M0.1, is powered ON (1) and the expression, D70 ≥ D72 (8,745,112 ≥ 7,451,323) is TRUE, the less than flag, F12.4 is energized.
As a result, the coil, Y4.1, is energized.
Memory Monitor
Notice
A rising-edge (one-shot) or falling-edge (one-shot) contact will NOT energize the output.
Not Equal (≠)
| Comparison | Operator | Flag | Comparison Range |
|---|---|---|---|
| Not Equal | S1 ≠ S2 | F12.5 | 0 ~ 4,294,967,295 |
The UDCMP instruction compares a DWORD value, S1, to another DWORD 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.
Ladder Diagram Example
If the contact, M0.1, is powered ON (1) and the expression, D78 = D80 (784,512 = 784,512) is FALSE, the less than flag, F12.5 is deenergized.
As a result, the coil, Y5.1, is deenergized.
If the contact, M0.1, is powered ON (1) and the expression, D78 ≠ D80 (784,512,000 ≠ 784,512) is TRUE, the less than flag, F12.5 is energized.
As a result, the coil, Y5.1, is energized.
Memory Monitor
Notice
A rising-edge (one-shot) or falling-edge (one-shot) contact will NOT energize the output.