mid

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Function A function calculates a result according to the current value of its inputs. A function has no internal data and is not linked to declared instances. - Extract characters of a string at any position Position means a point in space which is described by different coordinates. Depending on the used system and transformation it can consist of a maximum of six dimensions (coordinates).This means three Cartesian coordinates in space and coordinates for the orientation. In ACS there can be even more than six coordinates. If the same position is described in different coordinate systems the values of the coordinates are different..

Inputs

Input	Data Type	Description
IN	STRING	Character string.
NBC	DINT	Number of characters to extract.
POS	DINT	Position of the first character to extract.

Outputs

Output	Data Type	Range	Unit	Description
Q	STRING			String containing the first NBC characters of IN.

Remarks

The first valid character position is 1.

FBD Language Example

FFLD Language Example

In the FFLD Language, the operation is executed only if the input rung (EN) is TRUE.
- The output rung (ENO) keeps the same value as the input rung.
- The function is executed only if EN is TRUE.
- ENO keeps the same value as EN.

IL Language Example

In the IL Instruction list - This is a low-level language and resembles assembly. Language, the first input (the string) must be loaded in the current result before calling the function.
- Other arguments are operands of the function, separated by comas.

Op1: LD Ladder diagram - This is a method of drawing electrical logic schematics. It is a very popular graphical language for programming Programmable Logic Controllers (PLCs). It was originally invented to describe logic made from relays. The name is based on the observation that programs in this language resemble ladders, with two vertical rails and a series of horizontal rungs between them.   IN
     MID  NBC, POS
     ST   Q

ST Language Example

Q := MID (IN, NBC, POS);