Nck Analog Outputs - Siemens SINUMERIK 840D sl Function Manual

Digital and Analog NCK I/Os (A4)
NCK I/O via PLC
1.2.4.2

NCK analog outputs

Number
The available analog NCK outputs are defined using general machine data
MD10310 $MN_FASTIO_ANA_NUM_OUTPUTS
(number of analog NCK outputs).
Function
The value of the analog output [n] can be defined directly in the part program using system
variable $A_OUTA[n].
Before output to the hardware I/Os, the analog value set by the NCK can be changed by the
PLC (see fig.).
Disable output
The PLC user program is capable of disabling the NCK outputs individually using interface
signal
DB10 DBB168 (disable analog NCK outputs).
In this case, 0 volts is output at the analog output (see fig.).
Overwrite mask
Every NCK analog value set by the NC part program can be overwritten from the PLC using
the overwrite mask. The previous NCK value is then lost (see fig.).
The following routine has to be carried out to overwrite the NCK value from the PLC:
1. The output n in question must be preset with the required analog value at PLC interface
2. The PLC setting value becomes the new NCK value when the overwrite mask for the
This value remains valid until a new analog value is set for the NCK by the part program, for
example.
44
DB10 DBB170 - 185 (PLC setting value for NCK analog output n).
relevant analog output (DB10, DBB166) is activated (signal transition 0 → 1).
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Extended Functions