Language Differences
33002515 07/2012
WORD Assignments to BOOL Arrays
Manual Correction
Assignments of HEX WORDS to complete Bool arrays sent to Word registers are 
possible in Concept, but not in Unity. A manual correction must be done, for 
The ST code must be changed to single-component assignments. 
The hex word must be split into single bits: 
AR2_BOOL[17] := true;
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Language Differences
33002515 07/2012
Topological Address Overlapping
Same Topological Address
In Unity, you are warned (during application analysis) if the same topological 
address is assigned to multiple variables.
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Language Differences
33002515 07/2012
Substitute %QD by %MF
Variables that are directly addressed in Concept with %QD can be initialized floating 
point constants or dual word constants. 
When mainly floating point constants appear, the Substitute %QD by %MF 
checkbox should be enabled.
Conversion Settings
Open the Conversion Settings tab via Tools → Options in Unity Pro to 
enable/disable the Substitute %QD by %MF check box before converting.
When this checkbox is enabled, %QD variables are converted to %MF variables.
When this checkbox is not enabled, %QD variables are converted to MW 
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Language Differences
33002515 07/2012
Structure Alignment Changed
DPM_Time Structure
Unity uses a 2-byte alignment for structures in contrast to Concept (1-Byte) to speed 
up the access to structure components. This affects system structures mapped to 
StateRam, because the same structures in Unity can be bigger including some byte 
The concerned structure is DPM_Time, which has been redefined for Unity to re-
map to the correct hardware addresses.
Concept’s DPM_Time definition:
sync: BOOL
ms:   WORD
Unity’s DPM_Time definition:
sync:   BOOL
ms_lsb: BYTE
ms_msb: BYTE
Manual Correction
If an application that includes the DPM_time structure is converted, the 
analyze/build process will fail for the redefined structure components (in the above 
example, ms_lsb, ms_msb). 
The user has to manually change the usage of these structure components in the 
application accordingly.
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Language Differences
33002515 07/2012
Undefined Output on Disabled EFs 
Outputs of EFs Not Kept
In case the EN switches from TRUE to FALSE, the outputs of EFs from the previous 
cycle are not kept in Unity. This reduces the memory consumption in the PLC. This 
is different from EFBs, which keep their value from the previous cycle. Concept uses 
static links to latch the value from the previous cycle.
Execution Behavior Differs Significantly
If a Concept application relies on the outputs of EFs to keep their old values, the 
execution behavior in UNITY will differ significantly.
Manual Correction
The application has to be changed manually. 
Links from outputs, which are assumed to keep their value, need to be replaced by 
variables. If the EN of an EF is set to false, the EF is not executed and a connected 
variable is not touched.
The output of the disabled SEL EF is kept and used as input for the EQ_INT function 
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Language Differences
33002515 07/2012
The output of the disabled SEL EF gets an undefined value, in this case 0. Therefore 
the output of EQ_INT function block has become true:
If the EN of the SEL is set to false, the ENO of the EQ_INT is also set to false, but the 
connected output variable keeps its value from the previous cycle:
NOTE: The use of a variable is mandatory to retain network results in case an EF 
becomes disabled.
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Language Differences
33002515 07/2012
Variables at Empty Pins
In Unity Pro it is necessary to fill provided inputs and outputs for derived data types 
or I/O parameters (this is not necessary in Concept).
If these types are not generic, the converter will fill these initially empty inputs and 
outputs with variables created by the converter. 
Conversion Settings
Open the Conversion Settings tab via Tools → Options in Unity Pro to 
enable/disable the Variables at empty pins check box before converting.
When this checkbox is enabled, empty link points will be filled with variables 
created by the converter.
When this checkbox is not enabled, empty link points will not be filled with 
variables created by the converter.
Language Differences
33002515 07/2012
SFC Section Retains its State When Performing an Online Modification
Online Modifications Without Resetting
In Unity it is possible to do online modifications of an SFC chart without resetting it. 
The SFC chart retains its state and will continue the execution.
NOTE: In Concept, the online modification of an SFC chart usually results in the 
resetting of the chart.
Language Differences
33002515 07/2012
SFCCNTRL Function Block in Unity Behaves Different to Concept
In Concept the RESETSFC input of SFCCNTRL resets all action variables of the 
related SFC section.
In Unity the INIT input of SFCCNTRL (that has a similar function as RESETSFC input 
in Concept) only resets the action variables that have been set by the SFC step. 
Action variables, for example, set by user logic or the Animation Table will not be 
Language Differences
33002515 07/2012
Weekday Numbering 
Different Numbering
In Unity the numbering of weekdays is different than Concept:
Function blocks: SET_TOD and GET_TOD will be converted to Unity as DFBs, which 
work in both directions. 
Because SET_TOD expects a "Concept" numbered weekday and translates it as a 
Unity coded value. Also the GET_TOD reads Unity value and returns to User the 
Concept value. 
System Word %SW49
NOTE: We do not recommend that you mix GET_TOD and SET_TOD programming 
with the use of system words (e.g. %SW49) in the same application.
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