Installing and Starting the Ethernet CP with STEP 7
55
SIMATIC NET NCM S7 for Industrial Ethernet
C79000-G8976-C129–06
Notice
Please note the following information on S7–300 stations:
If you selected the option ”Update OB1 process image cyclically” in the CPU confi-
guration, (default), make sure that the start address of the CP is outside the pro-
cess image area (start addresses in the ”Addresses” tab).
Example: if the process image selected for the CPU = 1024 (0...1023), an address
>= 1024 must be selected for the CP.
Options Tab
Depending on the CP type, you can make the following settings:
Table 2-1 Settings in the “Options” Tab
Option
Meaning / Effect
S Time-of-Day Synchronization Here, you decide whether the CP passes on time-of-day frames or
not. You require this function if you have several CPs in a station
since only one CP (on the same network) is permitted to pass on the
time synchronization messages.
Note
The time-of-day synchronization function does not exist for all module
types.
S Data transfer > 240 bytes With this option, you specify whether or not the CP will support jobs
with a data length of more than 240 bytes (for S7-300 stations).
Notes
S The transfer of more than 240 bytes of data is supported by
newer version CPs. Please note the information in the product
information bulletin / manual of the Ethernet CP.
Please note the information in Section 5.1 on the
newer CP types.
S Remember that with this configuration on an S7-300, one
connection resource (free connection for S7 functions) of the
S7-300 CPU is used. CPU connection resources are also used,
for example, by S7-300 CPs, in the FMS mode or by PGs and
OPs. For more detailed information about the maximum
connection resources, refer to /13/ and /7/.
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