Panasonic FP Series Programming Manual page 597

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Bit-shift instructions

The function rotates the value at output d to the left. The number of bits at output d to be rotated to

the left is specified by the value assigned at input n. This shift can lie between 0 and 255 (only the

lower value byte of n is effective).Left rotate means that the bits shifted out of bit position 31 (MSB)

are shifted via bit position 0 (LSB) into the value at output d.

When input n = 0, no rotation takes place.

When at input n > 32, the same result is achieved as with a number n < 32: e.g. n = 33 produces

the same result as when n = 0; n = 34 the same as n = 1.

The bit at position 32 - n (the last bit shifted out to the right) is simultaneously stored in special

internal relay R9009 (carry flag) so that it can be evaluated accordingly.

This instruction also exists as a P instruction (for FP2/2SH, FP3/5, FP10/10SH PLC types), which

is only executed at the rising edge of the EN trigger. Select [Insert P instruction] from the

"Instructions" pane if you require a P instruction. To facilitate reuse, the instruction then appears

under "Recently used" in the pop-up menu. Press <Ctrl>+<Shift>+<v> within the programming

area to open the list of recently used elements.

Availability of F126_DROL (see page 1321)

In this example, the same POU header is used for all programming languages. For an example

using IL (instruction list), please refer to the online help.

32-bit data left rotate

1 0 1 0 1 1 0 0

number of bits to be rotated (range: 0 to 255)

for an instant

 the bit at position 32 - n of d has the

dec. or hex.