Referencing With Incremental Measurement Systems; Hardware Signals - Siemens SINUMERIK 840D sl Function Manual

R1: Referencing

15.5 Referencing with incremental measurement systems

Programming
Syntax
G74 <machine axis> {<machine axis>}
Meaning
G74:
<machine
axis>:
Reset response
Mode group reset or channel reset aborts the reference point approach for all programmed
machine axes:
● DB11, ... DBX0.7 (mode group reset)
● DB21, ... DBX7.7 (channel reset)
All machine axes for which the reference point approach is not yet successfully completed
when the action is canceled remain in status "Not referenced":
● DB31, ... DBX60.4 (referenced/synchronized 1) == 0
● DB31, ... DBX60.5 (referenced/synchronized 2) == 0
15.5 Referencing with incremental measurement systems
15.5.1

Hardware signals

Depending on the machine design and the properties of the incremental measuring system
used, different hardware signals must be connected.
Reference cam
● Connection
The reference cam signal can be connected to a digital input of an external PLC I/O module
or to a fast input on the NCU X142 interface.
● NC/PLC interface signal
The reference cam signal must be transferred from the PLC user program to the axial NC/
PLC interface:
DB31, ... DBX12.7 (deceleration of reference point approach)
1154
Command for referencing machine axes
Alone in the Yes
block:
Effective‐ Non-modal
ness:
The name of a machine axis must be specified (MD10000 $MN_AXCONF_MA‐
CHAX_NAME_TAB).
The machine axis must be a channel axis of the channel in which the part program
or the synchronized action is executed.
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions