Siemens SINUMERIK Series Function Manual page 34

A4: Digital and analog NCK I/Os for SINUMERIK 840D sl
1.2 Access via PLC
Setting mask
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 should
be output at the hardware output.
The following sequence has to be carried out to define the "PLC value":
1. The relevant PLC interface output has to be set to the required signal status.
2. The setting mask must be set to "1" for the relevant output:
Unlike the overwrite mask, the 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 is used at the PLC interface for the overwrite and setting masks.
Therefore, an identical output signal state is the result if the signal state is changed
simultaneously in the overwrite and setting masks.
Disable output
Digital NCK outputs can be disabled individually from the PLC user program:
DB10 DBB4 or DBB130 ... (block the digital NCK outputs)
In this case, the "0" signal is output at the hardware output.
Read setpoint
The current "NCK value" of the digital outputs can be read by the PLC user program:
DB10, DBB64 or DBB186 ... (setpoint for digital NCK outputs)
Please note that this setpoint ignores disabling and the PLC setting mask. Therefore, the
setpoint can differ from the actual signal state at the hardware output.
Behavior at program end / reset
At the end of the program or on reset, a specific default value can be assigned by the PLC
user program to every digital output in accordance with requirements, using the overwrite
mask, setting mask or disable signal.
Response to POWER ON
After POWER ON, the digital outputs are set to "0" in a defined manner. This can be
overwritten from the PLC user program according to the specific application using the
overwrite or setting mask.
Digital NCK outputs without hardware
If digital NCK outputs, as defined via MD10360, are written by the part program, but are not
available as hardware, no alarm is output. The NCK value can be read by the PLC (DB10
DBB64 or DBB186 ... ).
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DB10 DBB6 or DBB132 ... (setting value of the digital NCK outputs from the PLC)
DB10 DBB7 or DBB133 ... (setting mask of the digital NCK outputs)
Function Manual, 03/2013, 6FC5397-1BP40-3BA1
Extended Functions