Commissioning - Siemens SINUMERIK 840D sl Function Manual

K5: Channel synchronization, axis interchange
6.2 Axis replacement
● "Neutral axis"
A neutral axis is an axis that is not currently assigned to a channel or the PLC. Before
traversing, it must first be requested by a channel or the PLC.
● "Axis in another channel"
An axis is in this state if a channel has requested the axis. However, it could not yet be
assigned to it because it is still occupied by another channel.
6.2.2

Commissioning

Parameter assignment
NC-specific machine data
● General parameterization of the axis replacement form
MD10722 $MN_AXCHANGE_MASK
Channel-specific machine data
● Parameterization of which axes belong to the channel or are channel axes:
MD20070 $MC_AXCONF_MACHAX_USED[<channel axis>] = <machine axis>
Note: Assignment of all axes used in the NC must be performed in any case as channel
axes of one or more channels, irrespective of the "axis replacement" function.
Axis-specific machine data
● If an axis is a channel axis in multiple channels, the machine data defines to which channel
the axis is assigned after control startup (power-on reset):
MD30550 $MA_AXCONF_ASSIGN_MASTER_CHAN[<channel>] = <channel number>
The parameterized channel is the master channel of the axis.
● Parameterization of the response if an axis is programmed in a part program and the axis
is not currently assigned to the channel:
– Display an alarm and do not traverse the axis.
– Automatically requesting the axis according to the command GET (Page 365)
– Automatically requesting the axis according to the command GETD (Page 365)
MD30552 $MA_AUTO_GET_TYPE[<axis>] = <response>
System variable
Axis-specific system variable
● Axis type in relation to axis replacement:
$AA_AXCHANGE_TYP[<axis>]
● Axis replacement status of the axis:
$AA_AXCHANGE_STAT[<axis>]
364
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
Extended Functions