Access To The Safety-Oriented Data Channel; Output Of Passivated Data (Substitute Values) In Case Of Error; F-Periphery-Db - TR-Electronic CD 582-Serie Handbuch

6 Access to the safety-oriented data channel

The safety-oriented data channel in the module Position + Velocity (XP) is
accessed via the process image, as with a standard periphery. However, direct access
is not permitted. The safety-oriented data channel of the measuring system may only
be accessed from the generated F-runtime group.
The actual communication between F-CPU (process image) and measuring system
for updating the process image takes place hidden in the background, by means of the
PROFIsafe protocol.
The measuring system occupies a larger area in the process image in the Position
+ Velocity (XP) module, due to the PROFIsafe protocol, than is required for the
measuring system function. The F-Parameter Block contained in the process
image is not included in the useful data. When accessing the process image in the
safety program, only access to the pure useful data is permitted!

6.1 Output of passivated data (substitute values) in case of error

The safety function requires that for passivation in the safety-oriented channel in the
Position + Velocity (XP) module, the substitute values (0) are used in the
following cases instead of the cyclically output values. This status is indicated via the
F-Periphery-DB with QBAD = 1, see below.
● at start-up of the F-System
● in the case of errors in the safety-oriented communication between F-CPU and
measuring system via the PROFIsafe protocol
● if the value set for the window increments under the iParameters is
exceeded and/or the internally calculated PROFIsafe telegram is defective
● if the permissible ambient temperature range specified under the corresponding
article number is fallen below or is exceeded much

6.2 F-Periphery-DB

For each F-Periphery and each measuring system an F-IO data block is
generated automatically during configuration in TIA Portal V14. With reference to
the generated safety program, see chapter "Safety Program Creation - Configuration
Example", this is block F00000_Safety(TR)_1 [DB30002] for the measuring
system. The F-IO data block contains tags which can be analyzed in the safety
program and can or must be written. An exception is the tag DIAG, which may only be
analyzed in the standard user program. Modification of the initial/current values of the
tags directly in the F-IO data block is not possible, as the F-IO data block know-how-
protected.
The tags of the measuring system F-IO data block must be accessed in the following
cases:
● user acknowledgment of the measuring system after communication errors or
after the start-up phase
● when analyzing whether passivated or cyclical data are output
● if the cyclical data of the Position + Velocity (XP) module are to be
passivated depending on defined states of the safety program, e.g. group
passivation
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12/17/2020 TR - ECE - TI - DGB - 0340 - 01
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