Siemens SINUMERIK 840D sl Function Manual page 1554

Z1: NC/PLC interface signals
19.1 Various interface signals and functions (A2)
DB10
DBX108.7 NC ready
Edge evaluation: No
Signal state 1 The control system is ready.
This interface signal is an image of the relay contact "NC Ready".
This signal is set if:
● Relay contact "NC Ready" is closed
● All the voltages in the controller have been established
● The controller is in the cyclic mode
Signal state 0 The controller is not ready. The relay contact "NC Ready" is open.
The following faults will cause NC Ready to be canceled:
● Undervoltage and overvoltage monitoring function has responded
● Individual components are not ready (NCK CPU Ready)
● NCK CPU watchdog
If the signal "NC Ready" goes to 0 the following measures are introduced by the controller if they are
still possible:
● The controller enable signals are withdrawn (this stops the drives)
● The following measures are introduced by the PLC basic program:
For further information see References!
The controller is not ready again until after POWER ON.
Corresponding to ... Relay contact "NC Ready"
Additional references ● Diagnostics Manual
● Function Manual Basic Functions; Basic PLC Program
DB10
DBX109.0 NCK alarm is active
Edge evaluation: No
Signal state 1 At least one NCK alarm is present.
This is a group signal for the interface signals of all existing channels:
DB21, ... DBX36.6 (channel-specific NCK alarm is active)
Signal state 0 No NCK alarm is active.
Corresponding to ... DB21, ... DBX36.6 (channel-specific NCK alarm is active)
DB21, ... DBX36.7 (NCK alarm with processing stop present)
Additional references Diagnostics Manual
1554
Signal(s) updated: Cyclically
– Status signals from NCK to PLC (user interface) are deleted (cleared)
– Change signals for help functions are deleted
– Cyclic processing of the PLC to NCK user interface is terminated
Signal(s) updated: Cyclically
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions