Data Transfer Nc - Plc, Plc - Nc; Data Transfer Nc Program - Plc; Data Transfer Plc - Nc Program (Q Parameter) - HEIDENHAIN TNC 426 PB/M Technical Manual

Table of Contents

7.3 Data Transfer NC

7.3.1 Data Transfer NC Program → PLC

7.3.2 Data Transfer PLC → NC Program (Q Parameter)

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, the PLC sets the acknowledgement marker

M4092. The PLC must then reset M4092, otherwise no further strobes can be

sent by the NC.

With the Q-parameter function FN19 you can transfer two values from an NC

program to the PLC. The TNC stores the transferred values as integer values

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

the unit of measure for the two values transferred. During transfer, the marker

M4075 is set by the NC. Transfer is acknowledged by the PLC by setting the

marker M4095.

Transfer active with FN19

Acknowledgement of transfer with FN19 PLC

Unit of measure for transfer with FN19

1st integer value from FN19

2nd integer value from FN19

Data transfer from the PLC to the NC program goes through Q parameters Q100

to Q107, i.e., from the PLC you can overwrite Q parameters Q100 to Q107:

In double word D528, enter the numerical value to be transferred.

In word W516, define the target parameter (0=Q100, 7=Q107).

Activate transfer with strobe marker M4131.

The TNC transfers the values with the next M/S/T strobe.

Activation of Q-parameter transfer to

the NC; data from D258, Q number from

Double word with multiple function,

here data for transfer from PLC to NC

Q Nr. 0-7 for numerical data transfer

HEIDENHAIN Technical Manual TNC 426, TNC 430