Definition Of An Axis Pair - Siemens SINUMERIK 840D sl Function Manual

Channel-specific activation
The function must be activated in the following NC channels:
● Always in the 1st channel of the NC
● All channels that are assigned – with the appropriate machine data parameterization – to
machine axes to be monitored
● All channels, which are assigned at a later point in time, e.g. through axis interchange, to
machine axes to be monitored
The function is activated on a channel-specific basis using machine data:
MD60972 $MN_CC_ACTIVE_IN_CHAN_PROT[0], bit n = 1
with bit n = 1: Activation in the (n+1)th channel of the NC, with n = 0, 1, 2, ...
21.3.3

Definition of an axis pair

Definition
A pair of machine axes to be monitored is defined in the following item of machine data:
MD61516 $MN_CC_PROTECT_PAIRS[<axis pair>] = <yyxx>
<axis pair>: Axis pair index, with n = 0, 1, 2, ... (maximum number of axis pairs - 1)
<yyxx>
xx
yy
Boundary conditions
Maximum number of axis pairs
A maximum of 12 axis pairs can be defined.
Axis number
The axis number m of a machine axis relates to machine data MD10002
$MN_AXCONF_LOGIC_MACHAX_TAB[ i ] where i = (m - 1).
Same axis types
The machine axes in an axis pair must be of the same axis type: Linear axis or rotary axis.
Modulo rotary axes
It is not permissible that machine axes of an axis pair are modulo rotary axes
● MD30300 $MA_IS_ROT_AX = 1 (rotary axis)
● MD30310 $MA_ROT_IS_MODULO = 0 (! OK, no modulo rotary axis !)
Special functions
Function Manual, 01/2015, 6FC5397-2BP40-5BA2
Meaning
1. and 2nd decimal place ⇒ axis number of the 1st machine axis
3. and 4th decimal place ⇒ axis number of the 2nd machine axis
TE9: Axis pair collision protection
21.3 Startup
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