Signals From Channel (Db21; Signals To Axis/Spindle (Db31 - Siemens SINUMERIK 840D sl Function Manual

19.10.2

Signals from channel (DB21, ...)

DB21, ...
DBX36.2 All axes that have to be referenced are referenced
Edge evaluation: no
Signal state 1 or All axes that must be referenced (linear axes and rotary axes) of the channel are referenced.
edge change
The machine data:
0 → 1
MD20700 $MC_REFP_NC_START_LOCK (NC start inhibit without reference point)
is zero.
If two position measuring systems are connected to an axis, that would prevent an NC start, then the
active one must be referenced so that the axis is considered to have been referenced.
An NC Start command for parts program processing is only accepted when this signal is present.
Axes that have to be referenced are axes, if:
MD34110 $MA_REFP_CYCLE_NR _ = -1
and the axis is not in the parked position (position measuring system inactive and the controller enable
withdrawn).
Signal state 0 or One or more axes of the channel have not been referenced.
edge change
1 → 0
Special cases, The spindles of the channel have no effect on this interface signal.
errors, ......
Corresponding to .... DB31, ... DBX60.4 (referenced / synchronized 1)
DB31, ... DBX60.5 (referenced / synchronized 2)
19.10.3

Signals to axis/spindle (DB31, ...)

DB31, ...
DBX2.4 - DBX2.7 Reference point value 1 to 4
Edge evaluation: no
Signal state 1 or When the reference cam is reached, the NCK is signaled which coded reference cam is actuated.
edge change
The interface signal:
0 → 1
DB31, ... DBX2.4 - DBX2.7 (reference point values 1 to 4)
must remain set until the reference point is reached,
or until a new coded reference cam is actuated.
If the machine axis has reached the reference point (axis stationary) then using the reference point
value pre-selected using
IS "reference point values 1 to 4" from the machine data:
MD34100 $MA_REFP_SET_POS (reference point value)
is transferred into the control as the new reference position.
Signal state 0 or No effect.
edge change
1 → 0
Signal irrelevant Linear measurement systems with distancecoded reference marks
for ...
Application exam‐ On a machine tool with large traversing distances, four coded reference cams can be distributed over
ple(s) the entire distance traveled by the axis, four different reference points approached and the time
required to reach a valid referenced point reduced.
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Signal(s) updated: cyclic
Signal(s) updated: cyclic
Z1: NC/PLC interface signals
19.10 Reference point approach (R1)
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