Nematron Pointe Controller Uživatelský manuál stáhnout pdf (Strana 412)

100

101

Appendix C: Ladder Diagram Block Reference Pointe Controller User Guide

410

* Any Input, Output, or Memory tag except 32-bit Real (F) or Bit (X). For more information, see

“Defining Input, Output, Memory tags” on page 114.

C.7.3 Extract sub-string from left (LEFT)

When used in a Ladder Diagram, the LEFT block extracts a sub-string of specified

length from the left end of a string (variable or literal) and sends the result to an

output.

Select the

tool (from the String 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: a sub-string of up to

specified Length (LEN) is extracted from the Input String (IN) and placed in the

Output String (OUT). The sub-string is extracted from the left end of IN.

For example:

IN: ‘Hello world. This is PointeControl.’

LEN: 8

OUT: ‘Hello wo’

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.

1 2 ... 407 408 409 410 411 412 413 414 415 416 417 ... 440 441

Komentáře k této Příručce

Žádné komentáře

Nematron Pointe Controller Uživatelský manuál Strana 412

Komentáře k této Příručce