Siemens SIMATIC ET 200M

ET 200M
Operating Instructions, 12/2008, EWA-4NEB780600602-08
129
Functions
8
8.1 Support for I/O modules with expanded input data
The IM 153-2BAx2 interface module supports I/O modules with expanded input data
(> 16 bytes). For more detailed information, refer to the documentation on the respective
modules.
Expanded output data are not supported.
For the ET 200M, this means that:
● The I/O module in use must support provision of expanded input data.
● The IM 153-2BAx2 supplies the substitute value "0" in the expanded input data of an I/O
module that is starting up or that has been removed.
● The total amount of input data must not exceed the following values:
– 128 bytes per slot
– 244 bytes per IM 153-2BAx2. i.e., per ET 200M
These limits are checked during configuration.
● "Standard" and expanded input data are internally consistent but not consistent relative to
each other.
The following figure illustrates this point.
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The expanded input data are updated in longer time intervals than the "standard" input
data.