Example - Ladder Diagram

ROR

The ROR instruction will rotate the WORD value, D, n number of bits to the right. The result of the rotation is saved in the same assigned WORD data register, D.

Ladder Diagram Example

The initial value of the WORD data register, D0, is 272.

When the contact, M0.0, is powered ON (1), the WORD data register, D0, rotates 3 bits to the right.

The value of the WORD data register, D0, changes from 272 to 34.

After rotation, no overflow occurred. The value of the carry flag bit, F11.2, is 0.

When the instruction is reenergized, the value of the WORD data register, D0, changes from 34 to 16,388.

After rotation, no overflow occurred. The value of the carry flag bit, F11.2, is 0.

When the instruction is reenergized, the value of the WORD data register, D0, changes from 16,388 to -30,720.

After rotation, overflow occurred. The value of the carry flag bit, F11.2, is 1.

RORP

The RORP one-shot instruction will rotate the WORD value, D, n number of bits to the right. The result of the rotation is saved in the same assigned WORD data register, D.
Every time this instruction executes, it energizes the output only once.

Ladder Diagram Example

The initial value of the WORD data register, D2, is 9,031.

When the contact, M1.0, is powered ON (1), the WORD data register, D2, rotates 1 bit to the right.

The value of the WORD data register, D2, changes from 9,031 to -28,253.

After rotation, overflow occurred. The value of the carry flag bit, F11.2, is 1.

When the instruction is reenergized, the value of the WORD data register, D2, changes from -28,253 to -14,217.

After rotation, overflow occurred. The value of the carry flag bit, F11.2, is 1.