Siemens 611-D, 840C 1852*

07.97 6 NC Machine Data (NC MD), NC Setting Data (NC SD)

6.7.1 Axis-specific MD bits 2 (axial bits 2)

Bit 3 "Suppression of acceleration limitation"

Bit 3=1 "Acceleration limitation not active"

With LINK ACTIVE, the acceleration of the following axis is not limited by

the control but is output directly, as determined by leading spindle. If MD

value 1768* is exceeded, no alarm is triggered.

Bit 3=0 "Acceleration limitation active"

With LINK ACTIVE, the acceleration of the following axis is limited to the

acceleration value set in the machine data (MD 1768*).

Note:

The limitation remains active until the synchronous speed or zero speed is

reached:

• On runup after switching on the link

• When switching from link factor

• When stopping the spindle by switching off the link

Bit 2 "Block change with synchronism fine"

Bit 2=1 After an overlaid movement, block change is triggered in the NC, as soon

as the following axis has reached "Synchronism fine" and all the partial

setpoints of the block have been output.

Bit 2=0 Block change is triggered when the synchronism speed has been reached

and all partial setpoints of the block have been output.

Block change with synchronism fine. Motor operating without disturbance. Behaviour corresponds to parallel

model.

Partial setpoint

Partial actual value

Synchronism fine window

Block change on 1 signal

Block change on 0 signal

delay

delay (derived from the time

constant of the parallel model)

Following axis/spindle-specific machine data bits

76543210

Bit No.

NC MD

1852*

Include tool

length

comp.

Include

program-

med ZO

G58...G59

Include

external ZO

Include

settable ZO

G54...G57

Include

DRF and

preset

Ref. system

GI positions

SINUMERIK 840C (IA)