Marginal Conditions - Siemens SINUMERIK 840D sl Function Manual

6.5

Marginal conditions

6.5
Mode group
Up to 10 mode groups are available for SINUMERIK 840D sl.
Only 1 mode group is available for SINUMERIK 828D.
Channels
Up to 10 channels are available for SINUMERIK 840D sl.
Only 1 channel is available for SINUMERIK 828D.
Axis/spindle interchange
For SINUMERIK 828D, an axis/spindle interchange is not possible between channels.
Change to the channel axis
If an axis is changed from PLC axis, neutral axis or axis in another channel to the axis type
channel axis, a synchronization must take place.
With this synchronization,
● the current positions are assumed
● the current speed and gear stage is assumed with spindles.
It is therefore obligatory to perform a feed stop which interrupts the active path movement.
If the axis is transferred with GET, this transition is clearly defined by the parts program.
If the axis is allocated by the PLC, the program section in which the change takes place is
not clearly foreseeable.
(Except by a separate user-specific NC <-> PLC logic)
For this reason, the change to the channel axis is delayed in the following conditions:
● Path operation is active (G64+ axes programmed)
● Thread cutting/tapping is active (G33/G331/G332)
Extended Functions
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
K5: Mode groups, channels, axis interchange
6.5 Marginal conditions
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