Siemens SIMATIC NET S7-300 Operating Instructions

Network topologies
2
2.1 Network topologies
Switching technology allows extensive networks to be set up with numerous nodes and
simpli󹪝es network expansion.
Which topologies can be implemented?
Linear (bus) and star topologies can be implemented with the compact switch module CSM 377.
Note
Make sure that the maximum permitted cable lengths for the relevant devices are not exceeded.
You will 󹪝nd the permitted cable lengths in the technical speci󹪝cations.
Bus topology
Figure 2-1 Bus topology with the CSM 377
Compact Switch Module CSM 377
Operating Instructions, 06/2022, A2B00073499-02 9

Siemens SIMATIC NET S7-300 Specifications

General

Product Type Designation	SIMATIC NET S7-300
Mounting	DIN rail mounting
Protection Class	IP20
CPU Models	Various models available (e.g., CPU 312, CPU 314)
Communication Interfaces	MPI, PROFIBUS DP
Power Supply	24 V DC power supply required. Different power supply modules available.
I/O Modules	Digital input modules, digital output modules, analog input modules, analog output modules
Programming	STEP 7 software
Supply Voltage	24V DC or 120/230V AC (depending on model)
Digital Inputs	Available via digital input modules
Digital Outputs	Available via digital output modules
Analog Inputs	Available via analog input modules
Analog Outputs	Available via analog output modules
Communication Functions	MPI, PROFIBUS DP, Ethernet (depending on model)
Protocols	MPI, PROFIBUS DP, TCP/IP (depending on model)
Operating Temperature	0°C to 60°C
Storage Temperature	70 °C
Memory	Depends on CPU model (e.g., 32 KB to 1.5 MB)