Instruction Manual

Appendix C: Ladder Diagram Block Reference Pointe Controller User Guide
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C.5.5 Shift bits Left (SHL)
When used in a Ladder Diagram, the SHL block shifts the bits of the input a
specified number of places to the left and sends the result to output.
Select the
tool (from the Logical and Bit Shift Blocks toolbar) and click on a
ladder rung to insert the following block:
Once the block is inserted, you can double-click on it to configure it.
Functional Description
This block always passes the Enable input state (EN) through to the Enable Out
output state (ENO) without change; when EN becomes on, ENO is turned on, and
when EN becomes off, ENO is turned off.
When EN becomes on, the block function is executed: the Input Value (IN) is shifted the specified
Number of Places (N) to the left and zeroes are placed in the vacated registers. The resulting bit
pattern is placed in the Output Value (OUT).
Therefore, a 16-bit example of SHL would be:
IN: 1010010101011101
N: 5
OUT: 1010101110100000
The block function is executed every time the ladder is scanned, so long as EN
remains on. If EN becomes off, then OUT remains at its last calculated value until
EN becomes on and the block function is executed again.
Configuration Reference
The parameters of this block are described in the following table:
Param Name Config Var Type Description
EN Enable no - The state of the rung (off/on)
received from the left.
ENO Enable
Out
no - The state of the rung (off/on)
passed to the right.