Siemens SINUMERIK 840D sl Function Manual page 1590
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- Function manual (2184 pages) ,
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Z1: NC/PLC interface signals
19.2 Axis monitoring, protection zones (A3)
DB31, ...
DBX3.6
Velocity/spindle speed limitation
Edge evaluation: no
Signal state 1 or
The NCK limits the velocity/spindle speed to the limit value set in the machine data:
edge change
MD35160 $MA_SPIND_EXTERN_VELO_LIMIT
0 → 1
Signal state 0 or
No limitation active.
edge change
1 → 0
Corresponding to ...
MD35100 $MA_SPIND_VELO_LIMIT (max. spindle speed)
SD43220 $SA_SPIND_MAX_VELO_G26 (programmable upper spindle speed limitation for G26)
SD43230 $SA_SPIND_MAX_VELO_LIMS (spindle speed limitation for G96/G961/G97)
DB31, ...
DBX12.0 - DBX12.1
Hardware limit switches plus and minus
Edge evaluation: no
Signal state 1 or
A switch can be mounted at each end of the travel range of a machine axis which will cause a signal
edge change
"hardware limit switch plus or minus" to be signaled to the NC via the PLC if it is actuated.
0 → 1
If the signal is recognized as set, alarm 021614 "hardware limit switch + or -" is output and the axis
is decelerated immediately.
The braking/deceleration type is defined using the machine data:
MD36600 $MA_BRAKE_MODE_CHOICE (braking behavior at the hardware limit switch)
If the controller enable is withdrawn at the same time as the "hardware limit switch" signal, then the
axis responds as described in Chapter A2 ("various interface signals").
Signal state 0 or
Normal condition - a hardware limit switch has not been actuated.
edge change
1 → 0
Corresponding to ...
MD36600 $MA_BRAKE_MODE_CHOICE (deceleration behavior when the hardware limit switch re‐
sponds)
DB31, ...
DBX12.2 - DBX12.3
2nd software limit switch plus or minus
Edge evaluation: no
Signal state 1 or
2nd software limit switch for the plus and minus directions is effective.
edge change
1st software limit switch for the plus and minus directions is not effective.
0 → 1
In addition to the 1st software limit switches (plus and minus), the 2nd software limit switches (plus
and minus) can be activated using these interface signals.
The position is defined using machine data:
MD36130 $MA_POS_LIMIT_PLUS2 (2nd software limit switch plus)
and
MD36120 $MA_POS_LIMIT_MINUS2 (2nd software limit switch minus)
.
1590
Signal(s) updated: Cyclically
Signal(s) updated: Cyclically
Signal(s) updated: Cyclically
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions
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