Siemens SIMATIC NET S7-300 Operating Instructions

1.3 Introduction
What is possible?
The CSM 377 device allows the cost-e󹪜ective installation of Industrial Ethernet bus or star
structures with switching functionality.
Note
It is not possible to use the CSM 377 switch in a redundant ring because it does not support
redundancy.
Note
If the CSM 377 switch is supplied over long 24 V power supply lines or networks, measures are
necessary to prevent interference by strong electromagnetic pulses on the supply lines. These
can result, for example, due to lightning or switching of large inductive loads.
One of the tests used to attest the immunity of the switch to electromagnetic interference was
the "surge immunity test" according to EN61000-4-5. This test requires overvoltage protection
for the power supply lines. A suitable device is, for example, the Dehn Blitzductor VT AD 24 V
type no. 918 402 or comparable protective element.
Manufacturer:
DEHN+SÖHNE GmbH+Co.KG Hans Dehn Str.1 Postfach 1640 D-92306 Neumarkt, Germany
WARNING
When used under hazardous conditions (zone 2), the CSM 377 switch must be installed in an
enclosure.
To comply with ATEX 95 (EN 60079-15), this enclosure must be at least IP54 in compliance with
EN 60529.
WARNING – EXPLOSION HAZARD: DO NOT DISCONNECT EQUIPMENT WHEN A FLAMMABLE OR
COMBUSTIBLE ATMOSPHERE IS PRESENT.
Introduction
1.3 Introduction
Compact Switch Module CSM 377
Operating Instructions, 06/2022, A2B00073499-02 7

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)