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Chapter 10: Function Blocks LogicPro User’s Guide

164 Watlow Anafaze Doc.# 28002-00 Rev 3.00

D-- is the INT or LONG integer Variable on which the

rotation is to be performed (also an output).

Outputs

Q-- is the rotation function’s output bit. The output bit is

disabled if the enable bit is False and is enabled as soon as the

enable bit is True.

D-- is the rotation function’s output destination (as well as

input). The input INT or LONG integer will be replaced with

the result of the rotation operation.

Shift (RSFT/LSFT)

symbol1 = RSFT, LSFT

The shift function, shown in Figure 10.46, performs a bit-

level shift of 16-bit or 32-bit integers: the right shift RROT

moves the i-th bit into the (i-1)’th bit, as the lower bits are lost

and the higher padded with zeros; the left rotation LROT

moves the i-th bit into the (i+1)’th bit, as the highest bits are

lost and the lower bits padded with zeros. The operation is

performed on either BIN or BCD numerals which are treated

simply as a collection of bits, such that range-checking is not

performed.

symbol2 = W, L, WP, or LP

The Variable D needs to be declared as integer type, of size

specified in this symbol, as follows. Two memory sizes are

available for this integer, word-length W (16-bit) and long-

word L (32-bit). In addition, the function block’s calculation

can be performed continuously, or only as pulses, when the

enable bit (EN) switches value from False to True. In the

continuous computation case, integers are marked as W or L,

while in the Pulse computation case, they are marked as WP or

LP.

Figure 10.46 The Right and Left Shift Function

Blocks

Inputs

EN-- is the shift function block’s enable bit: the conversion is

performed if it is True.

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Watlow LogicPro Manual de usuario Pagina 180