Siemens SINUMERIK 840D sl Function Manual page 1555

DB10
DBX109.5 NCU heat sink temperature alarm
Edge evaluation: No
Signal state 1 In the NCU, the limit values of the heat sink temperature was exceeded.
The heat sink temperature has been activated and a steady operation of the operator panel is no
longer guaranteed.
Signal state 0 The heat sink monitoring function of the NCU has not responded.
DB10
DBX109.6 Air temperature alarm
Edge evaluation: No
Signal state 1 The ambient temperature or fan monitoring function has responded.
This may be due to the following causes:
● The temperature monitoring has identified an ambient temperature that is too high (approx. 60
● The speed monitoring of the 24 VDC fan used to cool the module has responded. Alarm 2120
Measures: Replace the fan and/or ensure that additional ventilation is provided.
When a temperature or fan error responds, a relay contact (terminal 5.1, 5.2 or 5.1, 5.3) in the infeed/
regenerative feedback unit is activated which can be evaluated by the customer.
Signal state 0 Neither the temperature monitoring nor the fan monitoring has responded.
Application exam‐ Appropriate measures can be initiated by the PLC user program if the temperature or fan monitoring
ple(s) is activated.
Corresponding to ... When a temperature or fan error responds, a relay contact (terminal 5.1, 5.2 or 5.1, 5.3) in the infeed/
regenerative feedback unit is activated. This can be evaluated.
Additional references Diagnostics Manual
DB10
DBX109.7 NCK battery alarm
Edge evaluation: No
Signal state 1 The NCK battery voltage monitoring function has responded.
This may be due to the following causes:
● The battery voltage is within the pre-warning limit range (approx. 2.7 to 2.9 V). Alarm 2100 "NCK
● The battery voltage is below the pre-warning limit range (≤ 2.6 V).
● When the controller powered-up, it was identified that the battery voltage was below the pre-
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Signal(s) updated: Cyclically
Signal(s) updated: Cyclically
°C). Alarm 2110 "NCK temperature alarm" is output.
"NCK fan alarm" is output.
Signal(s) updated: Cyclically
battery warning threshold reached" has been triggered.
Refer to References for effects and measure.
Alarm 2101 "NCK battery alarm" is signaled in cyclic operation.
Effects: A supply voltage failure - e.g. when the controller is switched off - would result in the loss
of battery-buffered data (e.g. part program memory, variables, machine data ...).
Measure: Refer to additional References.
warning limit range (≤ 2.6 V).
Alarm 2102 "NCK battery alarm" is output; NC ready and mode group ready are not issued.
Effects: Some of the battery-buffered data may already have been lost!
Measure: Refer to additional References.
Z1: NC/PLC interface signals
19.1 Various interface signals and functions (A2)
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