Plc Programming - HEIDENHAIN iTNC 530 HSCI Technical Manual

9 PLC Programming

9.1 PLC Functions
July 2013
The integrated PLC of the iTNC contains its own text editor for creating the list
of statements for the PLC program. You enter PLC commands and comments
using the keyboard. It's easier, however, to create your PLC programs on a PC
with the PLC compiler software PLCdesignNT. If you want to use
PLCdesignNT, please contact HEIDENHAIN.
The iTNC supports you with the COMPILE function, which checks the PLC
program for logical errors, and the TRACE, TABLE and WATCH LIST functions,
with which you can check the status of the operands.
Due to symbol information used in common by the main program and the soft-
key file, a specific sequence must be followed in order to avoid conflicts when
compiling the PLC program.
Soft-key project file

Main program of the PLC

Soft-key project file (2nd compilation procedure for checking the symbol

information)
The process memory works with a compiled PLC program up to a size of 512
KB. At least every 12 ms—this is the PLC cycle time—the iTNC starts a new
PLC scan. The PLC cycle time can be set with MP7602 and ascertained with
Module 9196.
9.1 PLC Functions
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