Lenze PROFIBU PC-based Automation - Manual (Page 35)

DMS 2.2 EN 07/2011 TD17
L
35
Control technology | PROFIBUS communication manual
Commissioning of PROFIBUS
Detailed commissioning steps
3. Assign for each address of the input and output objects (e.g. %IB0, %QB0, ...) a
symbolic name which is non-ambiguous in the entire control configuration in
accordance with the IEC 61131 syntax (no blanks and leading digits in the variable
name):
• Symbolic names can be entered by a mouse-click in front of ’AT %... ;’.
The function key serves to open the input assistance in the »PLC Designer«.

Note!
When symbolic names are entered, corresponding system variables are created
for the PLC program.
Always use the system variables within the PLC program in order to access the
input and output objects or assign values to them.