Siemens SINUMERIK 840D sl Function Manual page 45

Setting mask
Furthermore, a PLC setting for each output can determine whether the current NCK value
(e.g. as specified by the NC part program) or the PLC value specified via the setting mask
(DB10, DBB167) should be sent to the hardware analog output (see fig.).
The following routine has to be carried out to define the PLC value:
1. The output n in question must be preset with the required analog value at PLC interface
2. The setting mask (DB10, DBB167) must be set to "1" for the analog output in question.
Unlike the overwrite mask, the current NCK value is not lost when a value is set in the setting
mask. As soon as the PLC sets "0" in the corresponding setting mask, the NCK value
becomes active again.
Note
The same setting value (DB10, DBB170 - 185) is used at the PLC interface for the overwrite
and setting masks.
Read setpoint
The current NCK value of the analog outputs can be read by the PLC user program:
DB10, DBB210 - 225 (setpoint of NCK analog output n)
Please note that this setpoint ignores disabling and the PLC setting mask. Therefore, the
setpoint can differ from the actual analog value at the hardware output (see fig.).
RESET/end of program
At the end of the program or on RESET, a specific default value can be assigned by the PLC
user program to every analog output in accordance with requirements, using the overwrite
mask, setting mask or disable signal.
POWER ON
After POWER ON the analog outputs are set to "0" in a defined manner. After booting, this can
be overwritten in the PLC user program according to the application, using the masks
described above.
Extended Functions
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
DB10 DBB170 - 185 (PLC setting value for NCK analog output n).
Digital and Analog NCK I/Os (A4)
NCK I/O via PLC
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