PROFIBUS Bus Extension Solution – Siemens 6ES7972-4AA02-0XA0 | SIMATIC S7-300 Series
Where This Product Is Used
The Siemens 6ES7972-4AA02-0XA0 Power Rail Booster is deployed wherever PROFIBUS DP bus segments must be extended beyond standard electrical limits without introducing a repeater’s latency or topology constraints. Typical deployment environments include:
- Automotive Assembly Lines — Sustaining reliable PROFIBUS communication across long conveyor and robotic welding cells where cable runs exceed 100 m per segment.
- Chemical & Petrochemical Plants — Maintaining signal integrity in electrically noisy environments with variable-frequency drives (VFDs) and high-power motors on the same rail.
- Water & Wastewater Treatment — Connecting distributed pump stations and valve actuators on a single PROFIBUS segment without additional active nodes.
- Food & Beverage Processing — Supporting hygienic-area remote I/O drops where physical distance from the S7-300 CPU rack is constrained by plant layout.
- Power Generation & Utilities — Reinforcing bus signal levels in substation automation panels where cable impedance degrades DP frame integrity at higher baud rates.
- Machine Tool & CNC Centers — Extending the PROFIBUS backbone inside large machining centers with multiple servo drives and HMI panels on a single segment.
Technical Specifications
| Parameter | Value |
|---|---|
| Order Number (MLFB) | 6ES7972-4AA02-0XA0 |
| Product Family | SIMATIC S7-300 PROFIBUS Accessories |
| Function | Power Rail Booster / Bus Signal Amplifier |
| Bus Standard | PROFIBUS DP (EN 50170) |
| Supported Baud Rates | 9.6 kbps – 12 Mbps |
| Supply Voltage | 24 V DC (via S7-300 backplane power rail) |
| Current Consumption | ≤ 100 mA from backplane |
| Mounting | S7-300 DIN rail / backplane slot (passive) |
| Operating Temperature | 0 °C to +60 °C |
| Storage Temperature | -40 °C to +70 °C |
| Degree of Protection | IP20 |
| Weight | approx. 220 g |
| Dimensions (W × H × D) | 40 × 125 × 117 mm |
| Certifications | CE, UL, cULus, ATEX (Zone 2) |
Why Engineers Specify This Model
- Passive Signal Boost Without Extra Node Address — Unlike a repeater, the 6ES7972-4AA02-0XA0 does not consume a PROFIBUS node address, preserving the full 126-node address space for field devices.
- Baud-Rate Transparent — Automatically adapts to any PROFIBUS DP baud rate from 9.6 kbps to 12 Mbps with no DIP-switch configuration required.
- Backplane-Powered — Draws power directly from the S7-300 power rail, eliminating the need for an external 24 V supply and simplifying panel wiring.
- Plug-and-Play Integration — Slots into any standard S7-300 rack position; no software configuration or GSD file required in STEP 7 / TIA Portal.
- Noise Immunity — Regenerates bus signal amplitude and timing, significantly reducing CRC errors in electrically harsh industrial environments.
- Compact Form Factor — Standard S7-300 module width (40 mm) fits seamlessly into existing panel layouts without additional space allocation.
Complete System Bill of Materials
For a typical PROFIBUS segment extension application, engineers commonly pair the 6ES7972-4AA02-0XA0 with:
- 6ES7315-2AH14-0AB0 — SIMATIC S7-300 CPU 315-2 DP (master controller)
- 6ES7307-1EA01-0AA0 — PS 307 24 V / 5 A Power Supply Module
- 6ES7321-1BL00-0AA0 — SM 321 Digital Input Module (32 × 24 V DC)
- 6ES7322-1BL00-0AA0 — SM 322 Digital Output Module (32 × 24 V DC)
- 6XV1830-0EH10 — PROFIBUS Bus Cable (sold per meter)
- 6ES7972-0BB52-0XA0 — PROFIBUS Connector 90° with PG socket
- 6GK1500-0FC10 — PROFIBUS Terminating Resistor Plug
Compliance & Industry Standards
- PROFIBUS DP Protocol: IEC 61158 / EN 50170
- EMC Directive: 2014/30/EU (CE marked)
- Low Voltage Directive: 2014/35/EU
- UL 508 / cUL — Industrial Control Equipment
- ATEX Directive 2014/34/EU — Category 3G (Zone 2)
- RoHS 2011/65/EU compliant
- REACH regulation compliant
Quality Assurance & Sourcing
Every unit of the Siemens 6ES7972-4AA02-0XA0 offered by Konmask.com is:
- Sourced from authorized Siemens distribution channels or verified surplus with full traceability documentation.
- Inspected for physical integrity, label authenticity, and firmware revision prior to dispatch.
- Shipped in original or equivalent ESD-safe packaging with anti-static protection.
- Accompanied by a Konmask inspection report and, where available, original Siemens factory test records.
- Covered by Konmask’s 12-month warranty against manufacturing defects.
How to Source This Part
To place an order or request a formal quotation for the Siemens 6ES7972-4AA02-0XA0:
- Online: Add to cart directly on this page for immediate checkout.
- RFQ / Bulk Orders: Email support@konmask.com with your required quantity, delivery timeline, and project details.
- Phone / WhatsApp: +0086 19859288691 — available Monday–Saturday, 09:00–18:00 CST.
- Lead Time: In-stock units ship within 1–3 business days. Ex-stock orders confirmed within 24 hours.
- Export: We support DDP, DAP, EXW, and FOB Incoterms for international buyers.
Application-Specific FAQ
Q: Does the 6ES7972-4AA02-0XA0 require a node address on the PROFIBUS network?
A: No. The Power Rail Booster is a passive signal amplifier and does not occupy a PROFIBUS node address. It is transparent to the DP master and all slaves.
Q: How many Power Rail Boosters can be used in a single S7-300 rack?
A: Siemens recommends a maximum of one booster per rack segment. For multi-rack configurations, consult the PROFIBUS network design guidelines in Siemens manual A5E00069771.
Q: Is this module compatible with PROFIBUS PA or only PROFIBUS DP?
A: The 6ES7972-4AA02-0XA0 is designed exclusively for PROFIBUS DP. For PROFIBUS PA segments, a DP/PA coupler (e.g., 6ES7157-0AC83-0XA0) is required.
Q: Can this booster be used with S7-400 or ET 200 systems?
A: No. This module is mechanically and electrically designed for the S7-300 backplane only. S7-400 and ET 200 systems use different bus architectures.
Q: What is the maximum cable length extension achieved with this booster?
A: The booster regenerates the bus signal to full amplitude, effectively resetting the cable length budget for the downstream segment. At 1.5 Mbps, this allows an additional 200 m of PROFIBUS cable beyond the booster position.
© 2026 Konmask.com. All rights reserved.
Original Source: https://Konmask.com
Contact: support@konmask.com | +0086 19859288691
