Siemens SINUMERIK 840D sl, Function Manual

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Detailed Description
2.1 Various interface signals and functions (A2)
Basic logic functions: NC/PLC interface signals (Z1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
57
DB31, ...
DBX94.3 |M
d
| < M
dx
Edge evaluation: no Signal(s) updated: cyclic
Signal state 1 or
edge change
0 → 1
611D signals to the PLC that the torque setpoint |M
d
| does not exceed the threshold torque M
dx
in
the steady-state condition (i.e. ramp-up completed) (refer to the diagram).
The threshold torque is set using the machine data:
MD1428 $MD_TORQUE_THRESHOLD_X (threshold torque)
as a % of the actual torque limit value.
The torque threshold characteristic is speeddependent.
While ramping-up, the interface signal:
DB31, ... DBX94.2 (|M
d
|< M
dx
)
remains at 1.
The signal |M
d
|< M
dx
only becomes active after ramp-up has been completed:
DB31, ... DBX94.2 (ramp-up completed) = 1
and the signal interlocking time for the threshold torque:
MD1429 $MD_TORQUE_THRESHOLD_X_DELAY (delay time n
d
< n
dx
- signal)
has expired
Signal state 0 or
edge change
1 → 0
The torque setpoint |M
d
| is larger than the threshold torque M
dx
.
If necessary, the PLC user program can initiate a response.