Actual-To-Nominal Value Transfer - HEIDENHAIN TNC 426 PB/M Technical Manual

Table of Contents

Actual-to-nominal

value transfer

During actual-to-nominal value transfer, the current position is saved as the

nominal position value. This becomes necessary, for example, if the axis has

been moved when the position control loop is open.

There are two ways to turn the actual position into the nominal position:

To transfer the actual position value in the MANUAL and ELECTRONIC

HANDWHEEL modes, set the corresponding bit in W1044.

To transfer the actual position in all operating modes, use Module 9145.

Ensure that actual-to-nominal value transfer does not occur continually,

since the position monitoring will not be able to detect any uncontrolled

machine movements. In this case no safe machine operation would be

Actual-to-nominal value transfer

Bits 0 to 8 correspond to axes 1 to 9

0: No actual-to-nominal value transfer

1: Actual-to-nominal value transfer

Module 9145 Actual-to-nominal value transfer

An actual-to-nominal value transfer for NC axes, or for PLC and NC axes

together, is possible only if the control is not active (M4176 = 0) or if there is

an M/S/T/T2/G strobe.

For a transfer only of PLC axes, the module can always be called.

For a transfer via M strobe, MP7440 bit 2 must not be set. For a transfer via

S/G strobe, MP3030 must not be set.

B/W/D/K <Axes bit-encoded>

Error recognition:

Actual value was assumed as nominal value

Error code in W1022

Invalid axis number

Missing M/S/T/T2/G strobe in M4176 = 1

Module was called in a spawn job or submit job

HEIDENHAIN Technical Manual TNC 426, TNC 430