Siemens SINUMERIK 840D sl Function Manual page 1114

NC/PLC Interface Signals (Z2)
Memory Configuration (S7)
DB31, ...
DBX99.1
Edge evaluation: No
Signal state 1 or edge
change 0 → 1
Signal state 0 or edge
change 1 → 0
Special cases, errors, ...
Corresponding to ....
19.15 Memory Configuration (S7)
No signal descriptions required.
1114
FS (following spindle) active
Signal(s) updated: Cyclic
The machine axis is currently operating as the following spindle.
The following spindle thus follows the movements of the leading spindle in synchronous
operation in accordance with the transmission ratio.
Note:
The signal is relevant only in synchronous operation.
The machine axis is not currently operating as the following spindle.
In the case of faults/disturbances on the following spindle which result in cancellation of the
FS "servo enable", the coupling relationship between the FS and LS is reversed and switched
over to an actual-value coupling internally in the control under certain circumstances.
DB31, ... DBX84.4 (Synchronous mode)
DB31, ... DBX99.0 (LS active)
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Extended Functions