Lenze DDS v2.3 - Manual (Page 19)

Drive PLC Developer Studio
Introduction
2-7
l
DDS EN 2.3
Restrictions occur through limited lengths in the string routines. Only 20 characters can be
processed before the string is cut.
The example below illustrates the restriction in online mode.
2.2.6 PLC_PRG
PLC_PRG is a special predefined organization unit for a cyclical task. This organization unit is called
exactly once per control cycle.
•
If Project ➞ ➞ ➞ ➞Insert object is run for the first time after a new project has been created, the
dialog box Organization unit is pre-assigned with an organization unit called PLC_PRG of type
Program. This pre-assignment should not be changed!
Caution!
Do not delete or rename the organization unit PLC_PRG if you do not use a task configuration. Do
not attach PLC_PRG to an already created task as PLC_PRG will then be called several times,
leading to logical errors.
PLC_PRG is generally the main program in a single task program.
2.2.7 System POUs
System POUs are hardware-dependent POUs (program organization units) with special functions
which are provided by the associated PLC (e.g. 9300 Servo PLC, Drive PLC). (Also refer associated
PLC manual)
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