Requirements
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The following actions were performed during the conversion according to the rules 
above:
z
The space that is occupied by the FFB was expanded to two columns.
z
One column each was added at the Input and Output sides of the FFB.
z
The connections between coils/contacts and the FFB were realized with FFB 
connections, not with horizontal connections with multiple segments.
Recognize and disconnect LD Networks
The converter must recognize networks in LD sections during the conversion. To 
achieve this, the following rules are applied:
z
An LD Network is a group of objects that are connected with each other without 
any other connections to other objects (except the bus bar).
z
The minimum distance is always applied to a complete column of a network. This 
means that if an object of a column requires a certain minimum distance, all other 
objects are also moved with a higher or equal horizontal position.
z
If there are several networks in the same row in Concept, the following network 
will be moved vertically until it no longer occupies the same rows with the 
preceding network.
z
To avoid undesired automatically created FFB connections, the space that is 
occupied by an FFB and its connection space will be checked for crossovers. In 
the event of crossovers the following objects will be moved horizontally.
Schematic diagram of an LD Network in Concept with crossovers
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Requirements
42
33002515 07/2012
Schematic diagram of an LD Network after the conversion to Unity
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Requirements
33002515 07/2012
43
Separate LD Networks
IEC LD sections contain many independent graphic areas (networks).
During the conversion of IEC LD sections, additional columns are added to the 
networks to avoid undesired automatically generated links in Unity Pro.
If the additionally inserted columns were to extend across the entire section, the 
original graphic would be modified too much. Therefore, the sections are divided in 
networks during the conversion and additional columns are only inserted for the 
associated network.
Inserting additional columns may cause a network to exceed its maximum section 
width and it is then wrapped into the next line.
If this causes networks to vertically overlap, the overlapping of the logic can lead to 
undesired automatic links in Unity Pro.
Open the Conversion Settings tab via Tools → Options in Unity Pro to 
enable/disable the Separate LD Networks check box before converting.
z
When this checkbox is enabled, recognized networks are moved vertically, which 
prevents overlapping.
z
When this checkbox is not enabled, recognized networks are not vertically 
moved. The original vertical arrangement of the graphics is maintained, but error 
messages may occur due to overlapping.
LD Column Break
Inserting additional columns may cause a network to exceed its maximum section 
width and it is then wrapped into the next line.
Open the Conversion Settings tab via Tools → Options in Unity Pro to edit the LD 
Column Break option before converting.
The number entered here determines the column after which a network is wrapped 
to the next column.
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Requirements
44
33002515 07/2012
Wrapping networks that are too wide
Since the width of the networks is expanded during the conversion the maximum 
section width may be exceeded.
To show the network that is now too wide, the part of the network that reaches 
beyond the far right edge of the section will be shown in a new row.
The connections are shown as connectors.
Example of an LD Network in Concept.
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Requirements
33002515 07/2012
45
The wrapped LD Network after the conversion to Unity.
Objects to recognize transitions
The different ways of handling ladder diagram LD objects in Concept (calling an FB) 
and in Unity Pro (system call) makes the use of State RAM variables (0x/1x register) 
necessary.
Because of the requirement that several write accesses to the 0x/1x register are 
possible during a cyclical sweep, there can be differing Online behavior between 
Concept and Unity Pro.
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Requirements
46
33002515 07/2012
The objects affected are:
z
Contact to recognize positive transitions
z
Contact to recognize negative transitions
In Concept the "Old Value" to recognize a transition will only be updated once per 
cycle.
In Unity Pro the "Old Value" will be updated during every write access.
Example:
Concept: Switch %QX1 from 0 -> 1 and the value of %MW1 and %MW2 increase.
Unity Pro: Switch %QX1 from 0 -> 1 and only the value of %MW1 increases.
NOTE: Use objects to recognize transitions with a certain variable only once per 
cycle.
Also see Located Variable, page 28 and Unity Pro Reference Manual, Use of set 
and reset coils leads to edge loss (see Unity Pro, Program Languages and 
Structure, Reference Manual ).
Macros
Macros (name begins with @) will be rejected by the converter because macros 
cannot be implemented in Unity. However, if you try to import an application with 
macros, the macros will be replaced with Dummy DFBs (indicated with the ‘~’ in the 
application name).
Error messages regarding these Dummy DFBs will appear during the analysis of the 
project. To correct these errors, simply remove all DFBs that were created to replace 
macros.
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Programming Language ST/IL
General
For some programming languages there are restrictions to observe when converting 
a project from Concept to Unity Pro.
Generic EFBs
Only call generic EFBs instances once.
Using Concept 2.2, assign the outputs directly after the EFB call of a variable.
Syntax with Concept 2.5
Only use the new syntax for Concept 2.5 (from Unity V2.0 onwards it is automatically 
converted).
Syntax with Concept 2.5:
GenEFB(in1:=x1, in2:=x2, out1=>x3, out2=>X4;
in1, in2, out1 and out2 are type ANY.
Generic EFBs in Concept
List of generic EFBs in Concept:
z
COMM library
z
XXMIT
z
CONT_CTL library
z
DEADTIME
z
EXTENDED library
z
HYST
z
INDLIM
z
LIMD
z
SAH
z
LIB984 library
z
FIFO
z
LIFO
z
R2T
z
SRCH
z
T2T
z
GET_3X
z
GET_4X
z
PUT_4X
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33002515 07/2012
Declaring EFBs
The declaration of EFBs in Unity Pro is found in the variables editor and no longer 
in the ST/IL sections as with Concept.
EFBs declared this way are no longer limited to only one section.
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49
Programming Language LL984
General
For some programming languages there are restrictions to observe when converting 
a project from Concept to Unity Pro.
LL984 is no longer supported by Unity Pro
Unity Pro only supports IEC conforming programming. The programming languages 
LL984 and LL984 specific configurations are not supported by Unity Pro.
See also Restrictions for old LL984 configurations, page 20.
Requirements
50
33002515 07/2012
Programming Language FBD
General
For some programming languages there are restrictions to observe when converting 
a project from Concept to Unity Pro.
Macros
When converting a Concept project to Unity Pro, sections created using macros are 
also converted.
These sections can also be manually copied and modified.
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