What Types Of Io Routing Exist - Siemens CP 1626 Operating Instructions Manual

Operating hardware
4.4 IO routing
When does it make sense to use IO routing?
The advantages of IO routing are in situations when a complex plant or machine is planned
with networked PROFINET IO systems.
Note
IO routing functionality is available only with PROFINET IO RT communication.
4.4.2

What types of IO routing exist?

Read and write
From the perspective of the IO controller for the control level, there are three IO routing
tasks:
● Read process inputs
● Write process outputs
● Read process outputs
Read process inputs
Inputs are always read submodule-oriented.
This means that the IO controller for the control level (and the IO controller for the process
level) can only ever read all bits of a submodule.
Write process outputs
When writing process outputs, on the other hand, there are two possible ways of writing:
● Writing submodule-oriented
All process outputs of a submodule are written by the IO controller for the control level
(submodule-oriented).
● Writing bit-oriented
Individual configured process output bits or bit areas are written by the IO controller for
the control level.
Read process outputs
Outputs are always read submodule-oriented. This means that the IO controller for the
control level can only ever read all bits of a submodule.
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Operating Instructions, 11/2018, C79000-G8976-C434-03
CP 1626