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Siemens SIMATIC NET System Manual

Siemens SIMATIC NET
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Basics of communication with Industrial Ethernet
1.3 Technologies of Industrial Ethernet
Industrial Ethernet
42 System Manual, 09/2019, C79000-G8976-C242-10
Characteristic
802.3af (also 802.3at type 1 or PoE)
802.3at Type 2 (also PoE+)
Power management When the connection is first established,
3 power classes are negotiated
When the connection is first
established, 4 power classes are
negotiated or there is continuous
negotiation in steps of 0.1 W
Reduction of the maximum operating tem-
perature of the cable
None 5 °C for an active mode (2 pairs)
Supported cable types
CAT 3 and CAT 5
CAT 6
A
and CAT 7
Supported modes Mode A (endspan), mode B (midspan) Mode A (Endspan), mode B
(Midspan)
Modes
Mode A
Phantom power via the data wires with
10BASE-T
100BASE-TX
1000BASE-T
Mode B
Wire feed in via the unused wires with
10BASE-T
100BASE-TX
In both cases, a 4-pair Ethernet cable is required since the contacts 4-5 as well as 7-8
are used for power supply. All cables CAT 5, CAT 5e, CAT 6, CAT 6
A
and CAT 7 fulfil this
requirement.
Safety circuit to protect devices without PoE capability
To ensure that you do not damage any devices without PoE capability by using PoE or
PoE+, a safety circuit is defined:
If the PSE identifies a resistance of 25 kΩ between the power wires, the end device is
capable of PoE. The power voltage is raised slowly by the PSE.
If the PSE detects other resistance values, the power is not increased, or it is turned off.
Classification of the power sourcing equipment (PSE)
Endspan
With Endspan, the power is supplied via a switch that can reach a device over Ethernet
cables. The switch must be capable of PoE. The two modes can be used in parallel if the
devices with PoE capability support this.
Midspan
Midspan is used when the switch is not PoE-compliant. The power is supplied by an
additional device between the switch and end device. In this case, only data rates of
10/100 Mbps can be achieved because the power is supplied via unused wires.

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Siemens SIMATIC NET Specifications

General IconGeneral
CategoryIndustrial Communication Software
ManufacturerSiemens
Operating SystemsWindows, Linux
Protocols SupportedPROFIBUS, PROFINET, OPC UA
CompatibilitySiemens PLCs, Third-party devices with supported protocols

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