Marginal Conditions - Siemens SINUMERIK 840D sl Function Manual

6.5

Marginal conditions

"Mode group" function
On SINUMERIK 840D up to 10 mode groups.
Number of Channels
Up to 10 channels are available on the SINUMERIK 840D control.
"Axis/spindle replacement" function
This function is available for
● SINUMERIK 840D with NCU 572/573
● SINUMERIK 840D sl with NCU 710/720/730
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)
Change from a channel axis
The change of a channel axis to a neutral axis or PLC axes cannot be performed during an
active path operation.
With RELEASE this is caused by the fact that RELEASE must be located in a separate NC
block.
If the PLC changes the axis type, a REORG is triggered internally. Therefore, the change
with the listed program conditions is delayed.
Extended Functions
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Mode Groups, Channels, Axis Replacement (K5)
6.5 Marginal conditions
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