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Access to the safety-oriented data channel
6.2.1.6 ACK_REQ
If a communication error is detected by the F-System for the measuring system, a
passivation of the measuring system is performed. ACK_REQ = 1 indicates that an user
acknowledgment is required by the measuring system.
The F-System sets the tag ACK_REQ = 1 as soon as the error has been eliminated and
an user acknowledgment is possible. After the acknowledgment the tag ACK_REQ is
reset to 0 by the F-System.
6.2.1.7 IPAR_OK
The tag IPAR_OK is used to change the parameter setting.
A precise description of how the tag can be analyzed in the event of a re-
parameterization of fail-safe DP standard slaves/IO standard devices can be found in
the PROFIsafe Specification from V1.20, or the documentation on the fail-safe
DP-standard slave/IO standard device.
6.2.1.8 DIAG
The DIAG tag provides non-fail-safe information of 1 byte on errors that have
occurred, for service purposes. Access to this tag in the safety program is not
permitted!
The coding and use of this tag can be found in the SIEMENS manual SIMATIC Safety
– Configuring and Programming, document order number: A5E02714439-AF.
6.3 Access to tags of the F-IO data block
For each F-IO and each measuring system an F-IO data block is generated
automatically during configuration in TIA Portal V14 and a name is created at the
same time.
The name is formed from the fixed prefix "F", the initial address of the F-Periphery and
the name entered in TIA Portal V14 in the properties for the F-IO.
Tags of the F-IO data block of an F-IO may only be accessed from the F-runtime
group, from which the channels of this F-IO are also accessed (if access present).
The tags of the F-IO data block can be accessed by specifying the name of the F-IO
data block and the name of the tag: "Fully qualified DB access".
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