IFM Ecomat 100 Mobile CR0301, Programming Manual

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ifm Programming Manual ecomatmobile CabinetController (CR0301) Runtime System V05 2016-04-21
System description Software description
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Calculations and conversions in the application program
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NOTE
If the following elements are required in the application program:
• mathematical functions (e.g. ATAN),
• calculations,
• conversions (e.g. REAL_TO_BYTE),
then the following applies to the values at the inputs and outputs of the corresponding operators:
► Strictly observe the admissible value range in each individual case!
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Otherwise, this may cause an FPU error in the controller.
Examples:
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The value of the target format that can max. represented is exceeded.
Example:
REAL_TO_INT (12345678.3)
> INT is limited to -32768...+32767 (only integers)
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An existing real number is obviously in the value range of the target format.
In reality, however, the number is outside the target format (because of the internal representation of
the real number).
Example:
DW := REAL_TO_DWORD (4294967295.0);
> The most accurate representation of 4294967295 in REAL is 4.294967296E9
> Therefore the value exceeds the max. permissible value of the target format by 1.
> DWORD is limited to 0...4294967295.
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Note the cycle time!
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For the programmable devices from the controller family ecomatmobile numerous functions are
available which enable use of the devices in a wide range of applications.
As these units use more or fewer system resources depending on their complexity it is not always
possible to use all units at the same time and several times.
NOTICE
Risk that the device acts too slowly!
Cycle time must not become too long!
► When designing the application program the above-mentioned recommendations must be
complied with and tested.
► If necessary, the cycle time must be optimised by restructuring the software and the system set-
up.