Slot Rules For Simatic S7300; Permitted Slots; Number Of Simatic Net Cps Being Operated At The Same Time; Multicomputing - Siemens S7-300 Configuration Manual

2.3

Slot rules for SIMATIC S7300

2.3.1

Permitted slots

In the SIMATIC S7300, there is no set slot assignment for the SIMATIC NET CPs. Slots 4 to
11 are permissible (1, 2 and 3 cannot be used for CPs).
The SIMATIC NET CPs can be installed both in the central rack and in an expansion rack,
linked to the central rack via an IM 360/IM 361 (Kbus connection).
2.3.2

Number of SIMATIC NET CPs being operated at the same time

The number of SIMATIC NET CPs that can be operated is not limited by the system (for
example S7300 CPU, slot rules etc.), but by the application (maximum cycle time of the
application). The following components must be added into the calculation of the cycle time
on top of the existing S7 user program:
● Execution time of the FCs:
● Data conversion:
Please refer to the information in the relevant device manual.
2.3.3

Multicomputing

This functionality is not supported by the SIMATIC S7300.
2.3.4

Removing/inserting (module replacement)

Note
Removing and inserting the SIMATIC NET CPs for the SIMATIC S7300 while the power is
on is not permitted.
You should also remember that by removing a module from the rack, all modules on the
other side of it will be disconnected from the CPU.
Configuring and commissioning S7 CPs for Industrial Ethernet
Configuration Manual, 09/2013, C79000-G8976-C182-13
For communication between the S7300 CPU and SIMATIC NET CPs, blocks (FCs/FBs)
are necessary. How often these blocks are called depends on the number of connections
or the number of SIMATIC NET CPs. Depending on the amount of data transferred, every
block call extends the time required by the user program.
It may also be necessary for the information to be converted before transfer or after
reception.
Characteristics of the Ethernet CPs
2.3 Slot rules for SIMATIC S7300
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