Siemens S7-1200 Manual page 19

4 Configuration/Engineering
Data sizes and update times
In the [Params] section, several parameter sets are defined, which are used later in
the EDS file.
The relevant information for the configuration of the EnetIoSystem are here
•
Update interval
•
Size of Inputs and Outputs
Figure 4-6 [Params] section RPI and Output Data size
In the above shown figure the parameter, marked with 1 describes the RPI called
"Requested Packet Interval" or update rate in µs.
The update rates in the range between 2.000µs (2ms) and 20.000.000µs (20s) are
valid for this device. The default setting is 10.000µs (10ms).
The parameter marked with 2, describes the size of the Output data in Bytes. The
valid range is in between 0 Bytes and 496 Bytes, where the default is equal to the
maximum size.
NOTE The maximum size of 496 Bytes is a limitation given by the ODVA® specification
for EtherNet/IP. It is introduced for compatibility reasons to ControlNet, which is
another network using the same communication mechanisms defined in CIP as
EtherNet/IP.
Further down in the [Params] section you will find the other relevant information for
the Input data size and the configuration data size. They are shown in the below
figure.
EtherNet/IP Scanner
Entry-ID: 109782314, V1.1.0,
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04/2021
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