Data Transfer Nc - Plc, Plc - Nc; Data Transfer Nc Program - Plc (Fn19: Plc =) - HEIDENHAIN iTNC 530 HSCI Technical Manual

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9.5 Data Transfer NC > PLC, PLC > NC

9.5.1 Data transfer NC program > PLC (FN19: PLC =)

Information is exchanged between PLC and NC by markers, bytes, words and

double words. The function of the individual markers, bytes, words and double

words is fixed.

The transfer of certain data to the PLC is controlled by strobes:

If an M function is output, the NC sets the strobe signal M4072. After

evaluating the M function, you must first set the acknowledgement marker

M4092 and then reset it. The PLC must then reset the acknowledgment

marker, otherwise no further strobes can be sent by the NC.

PLC messages that would terminate an NC strobe are only released once

all PLC functions that are only permitted during the strobe have been

If there is an emergency stop, current NC strobes are automatically

acknowledged by the NC, and in this case should not be acknowledged

additionally by the PLC.

With the Q-parameter function FN19: PLC = you can transfer two values from

an NC program to the PLC. The iTNC stores the transferred values as integer

values of the form 1/10 000 in the double words D280 and D284. M4570

defines the unit of measure of both numerical values. During transfer, the

marker M4075 is set by the NC. The PLC must acknowledge the transfer by

setting marker M4095.

Transfer active with FN19

Acknowledgment of transfer with

Unit of measure for transfer with

First numerical value from FN19

Second numerical value from FN19

9.5 Data Transfer NC > PLC, PLC > NC