HEIDENHAIN MANUALPLUS 620 - 8.1.1 The API 3.0 symbolic memory interface

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1482 HEIDENHAIN Technical Manual MANUALplus 620

8.1.1 The API 3.0 symbolic memory interface

The PLC programmer needs an interface for coupling his program to the

functions and states of the NC part of the control. Often such an interface is

known as API (Application Programming Interface). Three methods are

used for HEIDENHAIN PLC programming:

 Integrated system subprograms (modules) are available: PLC modules

 On HEIDENHAIN NCK-based controls, a shared, structured data area is

available, which the PLC programmer accesses with symbolic structure

operands: The API 3.0 symbolic memory interface.

This Technical Manual deals only with the symbolic memory interface.

If you are using the API 3.0 symbolic memory interface, symbolic operands are

available, see "Overview of the PLC Operands" on page 604

Use The following structures exist:

Group Type of

structure

Structure definitions

General data ApiGen PlcApiGeneral

Operating modes ApiOmg PlcApiOmg[OMG_COUNT]

Processing channels ApiChn PlcApiChannel[CHANNEL_COUN

Axes ApiAxis PlcApiAxis[AXIS_COUNT]

Spindles ApiSpin PlcApiSpindle[SPINDLE_COUNT]

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