Concept2.6 LL984功能块：IEC库与数据处理模块详解

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At a glance

840 USE 504 00 October 2002

Concept EFBs and Parameters

Mode of

functioning of

Concept

The Concept compiler checks that each parameter variable has the same data type

as the EFB pin. This is why several different ADD functions are necessary to cover

for all the known elementary datatypes (integer, double integer or float, etc.).

When defining an EFB for Concept each parameter must have a pre-defined

datatype. If an EFB works with a special data-structure, then this data structure must

be defined in Concept when implementing the EFB. During application program

design it is not possible to connect a variable of another datatype to a certain pin of

the EFB.

Tables under Concept

Mode of

functioning of

Concept

If we now look to "tables" then we see there are some difficulties. If an EFB works

with a table, then this table must have been previously defined. If the table is an

array of 10 integers this must be defined in the DTY data of the EFB library in the

following way.

TYPE TI_10 :

ARRAY[0..9] OF INT;

END_TYPE

When we now design an EFB using this array we can, for example, put/ get array-

elements to/from the array. The EFB however only works with an array of 10

integers. If we need more elements, then we have to define a new (different) data-

type. Even so the existing EFB will not work with this new data type as it is not the

same as that defined during the design of the EFB.

The first problem is to define the right number of ARRAY elements.

The next problem is that we have to define different EFBs for arrays of different

datatypes.

At a glance

840 USE 504 00 October 2002 17

Concept EFBs and the ANY data type

Functioning

mode of Concept

Concept has the special data type ‘ANY’ available for simplifying table operations.

A pin declared with this data type can be linked to a variable of any data type. In

order to work properly, at run time, the size (in bytes) of the data type of the

connected variables is transferred to the EFB as a hidden parameter. However the

actual type of the variable (whether it is an INT, UINT, WORD, a structure of

elements or an array) is still unknown to the EFB.

Example The EFB is passed a pointer to a variable which has a size of 4 bytes. Whether these

4 bytes are of type DINT or REAL is unknown. For this reason the parameter ANY

can only be used if the processing of this parameter is clearly defined. In the above

example the EFB doesn't know whether to perform floating point or integer

arithmetic. Should the size increase, it becomes more and more unclear as to what

data type the variable is. (e.g. a size of 100 bytes could be an array of bytes,

integers, or reals, or a structure with different data types)

Further

restrictions

Another restriction of the datatype ANY is, that if this type is used more than once in

the same EFB, all pins of this type must be connected to variables of the same

datatype.

Implementation aspects

Procedure These differences between Concept and Modsoft outline what is possible for the

conversion of the Modsoft functions to a Concept EFB library.

In the implementation we have contrasting requirements:

Implement the function conforming as much as possible to the existing solution

in Modsoft.

i.e. only implementing a state RAM solutions (cannot be used with localized

variables)

Implementing the function according to the standard programming rules for

IEC1131.

i.e. different solutions for parameters and consequently in mode of operation.

Limitations The Modsoft functions BLKM, BLKT and TBLK are not included in this package.

BLKM already has an equivalent Concept function named MOVE.

BLKT and TBLK can be replaced with a similar DFB function.

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