Functions
5.2 Intelligent IO devices (I-devices)
PROFINET with STEP 7
Function Manual, 05/2021, A5E03444486-AL
141
I-device with three or more ports
If you have an I-device with three or more ports, connect the I-device to one or both ports to
the higher-level IO system in a linear bus topology. Connect the third port to the lower-level
IO system uncoupled from the linear bus topology as shown in the following figure.
Figure 5-19 I-device with three or more ports
5.2.9
Boundary conditions when using I-devices
Note the following boundary conditions when using I-devices:
Bandwidth
The number of addresses of the configured transfer areas affects the usable bandwidth of the
I-device:
•
Bandwidth of the transfer areas + bandwidth of the lower-level IO system = total
bandwidth used on the I-device
If the address space of the transfer areas is too large, this indicates a larger bandwidth
requirement and can thus lead to longer update times.
Tip
: Keep the address space of the transfer area as small as possible.
Содержание SIMATIC ET 200AL
Страница 2: ......
Страница 143: ......
Страница 218: ......
Страница 250: ......
Страница 296: ......
Страница 337: ......
Страница 365: ......
Страница 392: ......
Страница 419: ......
Страница 451: ......
Страница 483: ......
Страница 597: ......
Страница 648: ......
Страница 702: ......
Страница 739: ......
Страница 781: ......
Страница 804: ......
Страница 828: ......
Страница 853: ......
Страница 880: ......
Страница 906: ......
Страница 996: ...Diagnostics ...
Страница 1121: ......
Страница 1565: ......