6ES7972-0AA02-0XA0 Siemens RS485 Repeater SIMATIC DP 12 Mbit/s IP20 120 MA

6ES7972-0AA02-0XA0 Siemens RS485 Repeater SIMATIC DP 12 Mbit/s IP20 120 MA

1. Key Features
- Signal Regeneration and Amplification: Re-shapes and amplifies attenuated RS-485 signals, extending the bus length to 1200m, with up to 9 units connected in series.
- Electrical Isolation: Opto-isolation between sections 1 and 2 eliminates ground loops and surges, protecting PLCs, I/O modules, and frequency inverters.
- Automatic Fault Detection: Built-in line diagnostics accurately identify cable breaks, short circuits, and their locations; the fault location is displayed directly on the HMI, reducing downtime by 70%.
- Plug and Play: Automatically detects baud rates from 9.6 kbit/s to 12 Mbit/s, no software configuration required; terminals and PG/OP interfaces are all on the front panel, allowing for wiring in 10 seconds.

2. Technical Specifications
- Part Number: 6ES7972-0AA02-0XA0
- Bus Protocol: PROFIBUS DP / MPI
- Node Capacity: 31 stations per segment, 62 stations total
- Power Supply: 24 V DC ±25%, Power Consumption 120 mA
- Protection Level: IP20, -25…+60 °C (Industrial temperature range)
- Dimensions/Weight: 45 × 128 × 67 mm, approx. 350 g
- Certifications: CE, UL, RoHS, REACH

3. Typical Applications
- Long-distance wiring for S7-300/400 and ET200 remote I/O
- Isolation between frequency converters, valve islands, and PLCs across cabinets
- System expansion: Double the number of nodes without modifying the program
- Predictive maintenance: Real-time bus quality monitoring and early warning

4. Installation and Commissioning
① Snap onto a 35 mm DIN rail
② Connect 24 V DC to the PWR terminal
③ PROFIBUS input → Segment 1, output → Segment 2
④ Set the termination resistor with the DIP switch; Green LED = normal operation, Red LED = fault indication
⑤ Fault information can be read directly via STEP 7 or TIA Portal; no oscilloscope required for maintenance.

5. Compatibility and Alternatives
Backward compatible with 6ES7972-0AA01-0XA0; can be used with fiber optic converters and DP/DP couplers to build a highly available redundant ring network.

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