Siemens SINUMERIK 840D sl Function Manual page 1177

Hide thumbs Also See for SINUMERIK 840D sl:

Table of Contents

Zero mark selection when several zero mark signals occur

If several encoder zero marks are detected in the traversing range of the machine axis due to

machine-specific factors, e.g. reduction gear between encoder and load, a BERO must be

mounted on the machine and connected via a digital input of the NCU interface in order to

clearly determine the reference point.

BERO signal: Zero mark selection

The processing of the BERO signal is performed exclusively in the drive. Connection and

parameterization, see Section "Hardware signals (Page 1154)".

The "Referencing in follow-up mode" function is enabled with:

MD34104 $MA_REFP_PERMITTED_IN_FOLLOWUP = TRUE

Starting the referencing operation

If the machine axis is in follow-up mode (DB31, ... DBX61.3 == TRUE) at the start of reference

point approach, the measuring system is referenced in follow-up mode.

If the machine axis is not operating in the follow-up mode at the start of reference point

traversing, the "normal" from the NC-controlled reference point travels is carried out.

Referencing in follow-up mode can be started in the following modes:

● JOG-REF: Traversing keys

● AUTOMATIC: Part program command G74

Sequence of the referencing operation (JOG-REF mode)

1. Activate follow-up mode of machine axis:

DB31, ... DBX1.4 (follow-up mode) = 0

DB31, ... DBX2.1 (controller enable) = 0

2. Take into account activation of follow-up mode:

DB31, ... DBX61.3 (follow-up active) = 1

3. Switch to JOG-REF mode.

4. External motion of machine axis across encoder zero mark or parameterized number of

distance-coded reference marks. The referencing operation is started internally in the NC

as soon as the machine axis is moved:

DB31, ... DBX61.4 (axis/spindle stationary) = 0

5. The measuring system is referenced after the encoder zero mark or the assigned number

of distance-coded reference marks have been successfully detected:

DB31, ... DBX60.4/60.5 (referenced/synchronized 1/2) = 1

Aborting the reference operation

Basic Functions

Function Manual, 01/2015, 6FC5397-0BP40-5BA2

R1: Referencing

15.8 Referencing in follow-up mode

Sinumerik 828d Sinumerik 840de sl