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6ES7972-0AA02-0XA0

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Siemens 6ES7972-0AA02-0XA0 is an RS485 repeater that regenerates PROFIBUS or MPI signals between two electrical bus segments.
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Technical specifications for 6ES7972-0AA02-0XA0

  • Manufacturer:
    Siemens
  • Part Number:
    6ES7972-0AA02-0XA0
  • Product Family:
    Siemens Simatic DP
  • Product Type:
    PROFIBUS and MPI RS485 Repeater
  • Stock:
    1
  • Network Types:
    PROFIBUS and MPI
  • Interface Standard:
    RS485
  • Bus Segments:
    2
  • Maximum Nodes per Segment:
    31
  • Transmission Rate Range:
    9.6 kbit/s to 12 Mbit/s
  • Rated Supply Voltage:
    24 V DC
  • Supply Voltage Range:
    20.4 to 28.8 V DC
  • Power Loss:
    0.7 W
  • Power Connection:
    Terminal block
  • Bus Connections:
    Two terminal blocks
  • Signal Regeneration:
    Bidirectional
  • Galvanic Separation:
    Between bus segments
  • Protection Rating:
    IP20
  • Operating Temperature:
    0 to 60 °C
  • Storage and Transport Temperature:
    -40 to 70 °C
  • Relative Humidity:
    Up to 95% at 25 °C
  • Weight:
    0.7716 lbs (0.35 kg)
  • Estimated shipping dimensions:
    4.5x12.8x6.7cm
  • Tariff Code:
    85176200
  • Country of origin:
    Germany
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Signal Regeneration Segment Limits Shield and Bonding Fault Isolation

Features:

  • Two electrical RS485 segments exchange PROFIBUS or MPI telegrams through one repeater.
  • Signal regeneration restores level and timing without translating addresses or protocols.
  • Each segment retains its own termination, node-count, and cabling boundary.
A received telegram is reshaped before transmission to the other segment.

Both directions use the same configured network rate.

Supply, shield, bonding, and termination checks distinguish wiring faults from traffic faults.

The Siemens 6ES7972-0AA02-0XA0 PROFIBUS MPI RS485 Repeater may remain available for quotation and support beyond End-Of-Life (EOL) by the manufacturer (OEM).
Siemens 6ES7972-0AA02-0XA0 PROFIBUS MPI RS485 Repeater Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.

Moving one serial telegram across two electrical segments

  • Receive side: The repeater detects the RS485 state on the active segment.
  • Reshaping: Internal electronics restore the signal level and edge timing.
  • Transmit side: The recovered telegram is driven onto the opposite segment.
  • Reverse traffic: Responses follow the same process in the other direction.

Keeping node loading and termination on the correct side

  • Node count: Each segment remains within its documented station capacity.
  • Termination: The physical end of each segment uses the required active termination.
  • Cable length: The selected bit rate determines the permitted electrical distance.
  • No translation: The repeater does not alter station addresses or protocol data.

Controlling interference around the RS485 path

  • Cable shield: The bus shield continues through the intended connector and bonding path.
  • Potential difference: Equipotential bonding limits current that would otherwise flow in the shield.
  • Separation: The repeater keeps the two RS485 signal sections electrically distinct.
  • Cabinet earth: Mounting and conductor routing support the installation EMC concept.

Locating a failure to one side of the repeater

  • Supply check: The 24 V input must remain inside the documented range.
  • Segment test: One cable section can be inspected independently from the other.
  • Rate match: Both sides must use the same PROFIBUS or MPI bit rate.
  • Node review: Duplicate addresses and excessive station loading remain network-level faults.
Description
Siemens 6ES7972-0AA02-0XA0 is an RS485 repeater for PROFIBUS and MPI networks. It joins two electrical bus segments while regenerating the serial signal and keeping the segment loading separate.

A telegram entering one side of 6ES7972-0AA02-0XA0 is detected, reshaped, and transmitted onto the opposite segment at the same bus rate. Return traffic follows the reverse path, so stations on both sides communicate as one logical network without sharing the same analog signal level.

Each segment connected to 6ES7972-0AA02-0XA0 has its own node-count and termination boundary. The repeater can extend the physical network, but it does not change PROFIBUS addresses or translate protocols, and both sides must use the same configured transmission rate.

The 24 V DC supply powers the regeneration electronics inside 6ES7972-0AA02-0XA0. Cable shielding, equipotential bonding, connector termination, and the physical distance permitted at the selected bit rate must be checked together when diagnosing intermittent communication.
Alternative Names
6ES79720AA020XA0 6ES7 972-0AA02-0XA0 6ES7972 0AA02 0XA0 Siemens 6ES7972-0AA02-0XA0 RS485 Repeater 6ES7972-0AA02-0XA0 PROFIBUS 6ES7972-0AA02-0XA0 6ES 7972 0AA02 0XA0 6ES7972/0AA02/0XA0
Technical notes
Set both bus segments of Siemens 6ES7972-0AA02-0XA0 to the same transmission rate and verify termination, shield bonding, node count, and 24 V supply.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Why can stations on one side of Siemens 6ES7972-0AA02-0XA0 communicate while the other side is silent?
Check Siemens 6ES7972-0AA02-0XA0 supply, the silent segment cable, termination, shield, node count, bit rate, connectors, and the first station beyond the repeater.
Does 6ES7972-0AA02-0XA0 create a new PROFIBUS address range?
No. 6ES7972-0AA02-0XA0 regenerates the RS485 signal but leaves all PROFIBUS or MPI station addresses in the same logical network.
How many nodes can be connected to each Siemens 6ES7972-0AA02-0XA0 segment?
Each electrical segment of Siemens 6ES7972-0AA02-0XA0 supports the documented maximum of 31 nodes, with termination and cable distance checked separately.
Why does a higher bus rate shorten the cable allowed around 6ES7972-0AA02-0XA0?
At higher rates the 6ES7972-0AA02-0XA0 segment has less timing margin, so the PROFIBUS cable length and connector layout must follow the rate-specific limit.
Can Siemens 6ES7972-0AA02-0XA0 correct duplicate node addresses?
No. Siemens 6ES7972-0AA02-0XA0 only regenerates electrical signals; duplicate PROFIBUS or MPI addresses must be corrected in the network configuration.