Siemens SINUMERIK 840D sl Function Manual page 359

7. A weighting factor by which the table value is multiplied (definable as a setting data which
8. Compensation tables can be multiplied in pairs (settable via system variables). The
9. The compensation can be activated in the following ways:
10. Setting:
Monitoring
To avoid excessive velocities and acceleration rates on the machine axis as a result of
applying sag compensation, the total compensation value is monitored and limited to a
maximum value.
The maximum compensation value is set for each axis with the following axial machine data:
MD32720 $MA_CEC_MAX_SUM
(maximum compensation value for sag compensation).
If the resulting total compensation value is greater than the maximum value, alarm 20124
"Sum of compensation values too high" is output. Program processing is not interrupted. The
compensation value output as an additional setpoint is limited to the maximum value.
Alteration of the total compensation value is also limited axially.
When the limit value defined by the following machine data is violated, alarm 20125 "Too
rapid change in compensation value" is generated:
MD32730 $MA_CEC_MAX_VELO (change in velocity with 1)
The program continues to run. The path not covered because of the limitation is made up as
soon as the compensation value is no longer subject to limitation.
Extended Functions
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
can therefore be altered by the part program, PLC or the user at any time) can be
introduced for every compensation table.
product is added to the total compensation value of the compensation axis.
– Machine data:
MD32710 $MA_CEC_ENABLE [AXi] (enable sag compensation)
enables the sum of all compensation relations for machine axis AXi.
– Evaluation of the compensation table [t] is enabled with the following setting data:
SD41300 $SN_CEC_TABLE_ENABLE[t]
(presetting for compensation table)
It is thus possible, for example, to alter the compensation relations either from the part
program or from the PLC user program (e.g. switching over the tables), depending on
the machining requirements.
MD10260 $MN_CONVERT_SCALING_SYSTEM=1
(basic system switchover active)
activates the following axial machine data:
MD32711 $MA_CEC_SCALING_SYSTEM_METRIC
(system of units of sag compensation)
The measuring system for all tables effective for this axis is set in this machine data.
Hereby all position entries are interpreted together with the calculated total compensation
value in the configured measuring system. External conversions of position information
are no longer necessary with a measuring system change.
Compensations (K3)
5.4 Interpolatory compensation
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