Signal Processing For The Nck Monitoring Channel - Siemens SINUMERIK 840D Description Of Functions

3 Safety-Related Functions
3.9 Safety-related input/output signals (SGE/SGA)
PLC SGEs/SGAs The NC/PLC interface (axis/spindle DB) acts as the SGE/SGA interface
between the PLC and drive for the drive monitoring channel. The PLC user
program must supply this interface with data. The standard PLC I/O devices
must be used to input/output signals to/from the machine.
The machine manufacturer defines, in the PLC user program, whether the
SGEs/SGAs are processed via the PLC I/O devices or whether they are
generated and evaluated internally in the software. His choice depends on the
particular application.
3.9.1

Signal processing for the NCK monitoring channel

The number of inputs and outputs that can be connected increases when the SI
Digital NCK inputs/
safety function is used
outputs for 840D
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•
References: /FB/, A4, Digital and Analog NCK I/Os
References: /HDB/, NCU Manual, SINUMERIK 840D
Please note the following with regard to NCK I/O devices:
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•
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SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
Note
PLC-SGEs must only be processed if they are required for a specific
application in the PLC user program. SGEs that are not used must be set to a
value of 0. This does not apply for external STOPs that are not used (refer to
Chapter 3.2).
Refer to Chapter 3.2.2 for information about SGEs/SGAs for the test stop for
external stops.
Note
The SGEs/SGAs must be supplied by the machine manufacturer, both in the
NCK monitoring channel and in the drive monitoring channel
up to 64 digital inputs and outputs for the function "Safe programmable
logic" SPL
by additional digital inputs and outputs for safety axes. Further information:
Two NCU terminal blocks and DMP compact modules are used for the
NCK I/O devices.
In comparison to "normal" NCK inputs/outputs (refer to References: /FB/,
A4, Digital and Analog NCK I/Os), other additional NCK inputs/outputs are
used for Safety Integrated.
The "normal" NCK inputs and those for Safety Integrated may also be used
for both purposes. An appropriate alarm is generated for NCK outputs that
are assigned twice.
Note
The digital inputs/outputs are reserved byte-serially for SGEs/SGAs. If at least
1 input/output is used for SGEs/SGAs, then the remaining inputs/outputs of
the byte concerned cannot be used for other functions.
© Siemens AG 2003 All Rights Reserved
11.03