Siemens SINUMERIK 840Di Function Manual page 1445

2.3 Reference point approach from part program (G74)
2.3
Referencing of machine axes can be activated for the first time or repeated from the part
program
Referencing must be repeated, for example, after:
• Converting the actual value of the machine axis: PRESETON function
• Machine axis is parked:
• DB31, ... DBB2.1 (servo enable) = 0
• Exceeding the encoder limit frequency of the position measuring system
Programming
Syntax
G74
Function
Machine axes can be referenced from a part program with part program instruction G74
Parameter:
The name of the machine axis must be specified. The machine axis must be a channel axis
of the channel in which the part program is processed.
Effective:
G74 is non-modal.
Special points to be noted
G74 must be programmed in a separate part program block.
Reset response
Using mode group reset:
DB11, ... DBX0.7 (mode group reset)
or a channel reset:
DB21, ... DBB7.7 (reset),
reference point approach is cancelled for all programmed axes.
All machine axes that have not yet successfully completed reference point approach when
the action is cancelled remain in status "Not referenced":
DB31, ... DBB60.4 (referenced/synchronized 1)
DB31, ... DBB60.5 (referenced/synchronized 2)
Reference Point Approach (R1)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
DB31, ... DBB1.5 (position measuring system 1) = 0
DB31, ... DBX1.6 (position measuring system 2) = 0
Machine axis Machine axis
{
Machine axes
2.3 Reference point approach from part program (G74)
}
Detailed Description
2-5