February 2012 11 – 115
11 PLC diagnosis
11.1 Introduction
Definition of PLC PLC is a generic term from control technology and is the abbreviation of:
Programmable Logic Controller (programmable control).
The PLC of the iTNC 530 HSCI is located in different units and is therefore referred to as
integrated PLC.
Tasks of the PLC îš„ Adaptation of different machine types to HEIDENHAIN controls
îš„ Assuming control tasks
Data exchange
with the PLC
In order to take on interfacing and control tasks, the PLC must exchange data with the machine and
with the NC part of the control.
Depending on the type of control, various inputs and outputs are available for data exchange with
the machine.
Data is exchanged between PLC and NC by markers, bytes, words, double words and PLC
modules.
Calling the
PLC mode
8 Select the Programming and Editing operating mode.
8 If open: Close the program management by pressing the END button.
8 Call the code number window.
8 Enter and confirm the code number.
8 The PLC main page is displayed.
The machine manufacturer creates the PLC program for the machine or adapts an existing
PLC project to his machine.
Changes to the PLC program or to the PLC wiring may influence not only the function but also
the safety of the machine!
This could lead to damage to property or persons.
Changes to the PLC may only be performed by the machine manufacturer!
Pressing the MOD key while the program manager is open calls screen where you can make the
interface settings.
If READONLY appears on the left side of the screen, the machine manufacturer has protected
the PLC mode by his own code number.
With the standard PLC code number 807667 the diagnosis options are limited.
--> Ask your machine tool builder!
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