Description of Components
2-6
DP/PA Link and Y Link Bus Couplings
A5E00193841-011
Parameter assignment for the PA field devices
With the aid of a suitable tool such as SIMATIC PDM, the parameters for the PA
field devices can be assigned on a programming device/PC that is connected to
the higher level PROFIBUS-DP. For more information, please refer to the
documentation of your parameterization tool.
User data of the DP/PA link
The DP user data frame of the DP/PA link is dependent on the number of
configured PA field devices. It consists of the data blocks of the configured PA field
devices arranged one next to the other. The data blocks are sorted in ascending
order by PA address.
According to the PROFIBUS-PA Profile for Process Control Devices, General
Requirements, each process variable is accompanied by a status byte that
contains information on the status of the process variable.
In the event of the failure of a PA field device, the associated input data and status
byte in the user data frame of the DP/PA link are reset first. The corresponding
information is then entered in the diagnostic frame.
When the PA field device is restored, the corresponding information is entered into
the diagnostic frame. At almost the same time, the valid input data of the PA field
device in the user data frame of the DP/PA link become available again. The status
byte indicates that the data is valid.
Note
To obtain the status of the PA field devices as quickly as possible, it is advisable to
regularly evaluate the status byte in the user program.
Содержание Simatic 6ES7 157-0AC80-0 A0 Series
Страница 14: ...Contents xiv DP PA Link and Y Link Bus Couplings A5E00193841 01 1 ...
Страница 42: ...Installation 3 12 DP PA Link and Y Link Bus Couplings A5E00193841 01 1 ...
Страница 70: ...Commissioning the DP PA Link 6 12 DP PA Link and Y Link Bus Couplings A5E00193841 01 1 ...
Страница 162: ...Technical Specifications B 40 DP PA Link and Y Link Bus Couplings A5E00193841 01 1 ...
Страница 170: ...Order Numbers and Accessories D 4 DP PA Link and Y Link Bus Couplings A5E00193841 01 1 ...
Страница 178: ...Glossary Glossary 8 DP PA Link and Y Link Bus Couplings A5E00193841 01 1 ...
Страница 182: ...Index Index 4 DP PA Link and Y Link Bus Couplings A5E00193841 01 1 ...