3.12 Access to Safety Integrated drives and F-I/O
Overview
A description is subsequently provided as to how you can address F-I/O and safety-related
drive telegrams in the safety program - and which rules you must observe.
Addressing via the process image
You address F-I/O and safety-related drive telegrams just the same as for standard I/O using
the process image (PAE and PAA).
Directly reading (with I/O access identifier ":P") inputs or writing to outputs is not possible in the
safety program.
Updating the process image
The process image of inputs of the F-I/O and safety-related drive telegrams is updated at the
start of the F-runtime group. The process image of outputs of the F-I/O and safety-related drive
telegrams is updated at the end of the F-runtime group (see Program structure of the safety
program (Page 55)).
The communication between the F-CPU (process image) and the F-I/O required to update the
process image is realized using a special safety protocol according to PROFIsafe.
.
Rules
● It is only permissible that you address a channel (channel value and value status) of an F-
I/O or a drive telegram in an F-runtime group. You define the assigned F-runtime group with
the first programmed addressing.
● It is only permissible that you address a channel (channel value and value status) of an F-
I/O or a drive telegram with the unit, which corresponds to the data type of the channel.
Example: It is only permissible that you access input channels, data type BOOL using unit
"Input (bit)" (Ix.y). It is not possible to access 16 consecutive input channels, data type
BOOL using unit "Input word " (IWx).
● Only address inputs and outputs that reference a real existing channel (channel value and
value status) - (e.g. for an F-DO 10xDC24V with start address 10, only outputs Q10.0 to
Q11.1 for the channel values, and inputs I10.0 to I11.1 for the value status). Also note that
as a result of the special safety protocol, the F-I/O and/or drive telegrams occupy a larger
area in the process image than is required for the real channels (channel values and value
status) on the F-I/O and/or the drive telegram.
Refer to the appropriate manuals for the F-I/O and/or the drive telegram regarding the area
of the process image in which the channels (channel values and value status) are saved
(channel structure). See also Sections Telegram structure and data (Page 355)
and Process data (Page 358).
Safety program of the F-PLC
3.12 Access to Safety Integrated drives and F-I/O
Safety Integrated (with SINAMICS S120)
84 Commissioning Manual, 02/2020, A5E46305916B AB
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