Reference End Position; Encoders With Endat Interface - HEIDENHAIN TNC 426 PB/M Technical Manual

Table of Contents

Reference end

Encoders with

EnDat interface

December 2001

To prevent the axes from violating their traverse limits when traversing the

reference marks, each axis requires a trip dog (at the reference end position).

The trip dogs must be installed by the machine tool builder at the ends of the

traverse range. The switch signals from the trip dogs are sent to free PLC

inputs. The PLC program must gate these PLC inputs with W1054 for

"reference end position."

Encoders with EnDat interface can be connected to the position and speed

inputs of the LE 426 M and LE 430 M. With these encoders there is no need

to traverse the reference marks. The position value is only read when the

control is switched on. It cannot be read again.

When connecting a position encoder with an EnDat interface:

Enter MP1350.x = 5.

When connecting a speed encoder with an EnDat interface:

The TNC automatically attempts to communicate with the encoder.

When connecting a speed encoder with an EnDat interface as a position

Enter MP1350 = 5.

In MP110.x, enter 0 for the axis with EnDat interface of the speed encoder.

If use of multiturn encoders with EnDat interfaces results in overruns, the

corresponding information is entered in the system file NCDATA.SYS. For

a control exchange, this file must be transferred or MP960.x must be

Reference Marks