Rules For Packaging Digital Information - WAGO -I/O-SYSTEM 750 Manual

82 Function Description
7.6.1.1

Rules for Packaging Digital Information

Only allocated data can be processed.
If a submodule type allocates more data than immediately required, the surplus
data volume can be occupied by submodule types that allocate no data. The data
volume of these submodule types, however, cannot be greater than that previously
allocated.
The following rules apply for allocating and occupying data:
•
Assignment is separate for inputs and outputs.
•
The assignment takes the order into account.
I/O modules, for which non-allocating submodule types have been
configured, can only occupy data previously made available by an allocating
submodule.
•
Assignment is section by section.
Once another I/O module is configured, whose submodule type allocates
input and/or output data, a new section begins. I/O modules with non-
allocating submodule types can only occupy data in the last allocating
section. The allocated data in preceding sections cannot be used
retroactively.
•
When assigning, only I/O modules with digital input and output data are
taken into account.
I/O modules with analog input/output data are ignored even when physically
between the digital input/output data according to the configuration.
•
When assigning, I/O modules are ignored, for which an incorrect submodule
type has been configured, i.e. for which the submodule type does not match
the I/O module physically inserted.
Allocated areas that are not occupied are handled as followed by the fieldbus
coupler:
•
Output data that has been allocated, but not occupied, is ignored by the
fieldbus coupler (DAP).
•
Input data that has been allocated, but not occupied, is set to zero ("false")
by the fieldbus coupler (DAP).
750-375 PROFINET IO advanced Fieldbus Coupler
WAGO-I/O-SYSTEM 750
Manual
Version 1.1.0