Switching Over The Measuring System - Siemens SINUMERIK 804D sl Commissioning Manual

10.2.5

Switching over the measuring system

The unit system is switched over for the entire machine using a softkey in the HMI Advanced
operating area "MACHINE". The switchover is only accepted if:
• MD10260 CONVERT_SCALING_SYSTEM=1
• Bit 0 of MD20110 RESET_MODE_MASK is set in every channel.
• All channels are in the Reset state.
• Axes are not traversing with JOG, DRF or PLC control.
• Constant grinding wheel peripheral speed (GWPS) is not active.
Actions such as parts program start or mode change are disabled for the duration of the
switchover.
If the switchover cannot be performed, this is indicated by a message in the user interface.
These measures ensure that a consistent set of data is always used for a running program
with reference to the system of measurement.
The actual switchover of the system of measurement is performed internally by writing all the
necessary machine data and subsequently activating them with a Reset.
MD10240 SCALING_SYSTEM_IS_METRIC and the corresponding G70/G71/G700/G710
settings in MD20150 GCODE_RESET_VALUES are switched over automatically and
consistently for all configured channels.
The value of machine data: MD20150 GCODE_RESET_VALUES[12] varies between G700
and G710.
This process takes place independently of the protection level currently set.
System data
When changing over the measuring system, from the view of the user, all length-related
specifications are converted to the new measuring system automatically. This includes:
• Positions
• Feed rates
• Acceleration rates
• Jerk
• Tool offsets
• Programmable, settable and work offsets external and DRF offsets
• Compensation values
• Protection zones
• Machine data
• Jog and hand wheel factors
After switching, all above mentioned data is available in the physical units according to
Chapter "Standardizing of physical units of machine and setting data".
Data for which no unique physical units are defined, such as:
• R parameters
CNC Part 1 (NCK, PLC, drive)
Commissioning Manual, 11/2006, 6FC5397-2AP10-2BA0
NCK start-up
10.2 System data
105