Siemens 6ES7972-0AA01-0AX0 – PROFIBUS DP Interface Module | SIMATIC S7-300 Platform
Engineering Background
The Siemens 6ES7972-0AA01-0AX0 is a dedicated PROFIBUS DP interface module (IM 306) designed for the SIMATIC S7-300 modular PLC platform. It enables seamless integration of distributed I/O racks into centralized S7-300 control architectures via the PROFIBUS DP fieldbus protocol — the industry standard for deterministic, high-speed process communication in discrete and continuous manufacturing environments.
Product Positioning
Targeted at automation engineers and system integrators who require reliable rack expansion over PROFIBUS DP, this module eliminates the need for additional CPUs in remote racks, reducing system cost and complexity. It is the preferred choice for upgrading legacy S7-300 installations and designing new distributed control topologies in automotive, chemical, food & beverage, and utilities sectors.
Complete Technical Specifications
| Part Number / SKU | 6ES7972-0AA01-0AX0 |
| Product Family | SIMATIC S7-300 Interface Modules |
| Module Type | IM 306 – PROFIBUS DP Slave Interface Module |
| Fieldbus Protocol | PROFIBUS DP (EN 50170) |
| Transmission Rate | 9.6 kbps – 12 Mbps (auto-detect) |
| Max. Distance per Segment | Up to 1,200 m (at 9.6 kbps); 100 m (at 12 Mbps) |
| PROFIBUS Address Range | 1 – 125 (configurable via STEP 7 / TIA Portal) |
| Supply Voltage | DC 24 V (via S7-300 backplane bus) |
| Current Consumption | ≤ 100 mA from backplane bus |
| Supported Rack Expansion | Up to 3 expansion racks (ER) per IM 306 |
| Max. I/O Modules per ER | 8 signal modules per expansion rack |
| Connector Type | 9-pin Sub-D female (PROFIBUS standard) |
| Operating Temperature | 0 °C to +60 °C |
| Storage Temperature | -40 °C to +70 °C |
| Relative Humidity | 10% – 95% (non-condensing) |
| Protection Class | IP 20 |
| Dimensions (W × H × D) | 40 × 125 × 120 mm |
| Weight | Approx. 500 g |
| Certifications | CE, UL, cULus, ATEX (Zone 2) |
| Country of Origin | Germany |
| Software Support | STEP 7 V5.x, TIA Portal V13+ |
Proven Application Environments
- Automotive Manufacturing: Distributed body-in-white welding lines with remote I/O racks up to 1,200 m from the central CPU rack.
- Chemical & Petrochemical Plants: Zone 2 ATEX-rated installations requiring certified fieldbus expansion in hazardous areas.
- Food & Beverage Processing: Hygienic production lines where centralized control with distributed sensor/actuator nodes reduces panel footprint.
- Water & Wastewater Utilities: Multi-pump station control with long-distance PROFIBUS DP segments across large plant footprints.
- Machine Tool & Press Lines: High-speed I/O response at 12 Mbps for synchronized multi-axis press control.
- Legacy S7-300 Upgrades: Drop-in replacement for aging IM 306 modules without hardware redesign or CPU reprogramming.
Engineering Advantages
- Auto Baud Rate Detection: Automatically synchronizes to the master’s transmission rate (9.6 kbps – 12 Mbps), eliminating manual DIP switch configuration.
- Hot-Swap Compatible: Supports module replacement under power in conjunction with S7-300 hot-standby configurations, minimizing unplanned downtime.
- Deterministic Latency: PROFIBUS DP cyclic data exchange ensures sub-millisecond I/O update times at 12 Mbps for time-critical process loops.
- Scalable Topology: One IM 306 supports up to 3 expansion racks, each with 8 signal modules — providing up to 192 additional I/O channels per interface module.
- Integrated Diagnostics: Module-level and channel-level fault reporting via PROFIBUS DP alarm telegrams, visible in STEP 7 / TIA Portal hardware diagnostics.
- Compact Form Factor: Standard S7-300 rail-mount design (40 mm wide) integrates directly into existing control panel layouts without additional mounting hardware.
System Architecture & Signal Flow
The 6ES7972-0AA01-0AX0 operates as a PROFIBUS DP slave on the fieldbus network. The S7-300 CPU (DP master) communicates with the IM 306 via the PROFIBUS DP segment. The IM 306 then forwards I/O data to the expansion rack’s signal modules via the S7-300 backplane bus (K-bus). Signal flow:
CPU (DP Master) → PROFIBUS DP Cable → IM 306 (6ES7972-0AA01-0AX0) → S7-300 Backplane Bus → Signal Modules (SM 321/322/331/332)
Configuration is performed in STEP 7 HW Config or TIA Portal Device Configuration by inserting the IM 306 GSD file and assigning the PROFIBUS address. No additional parameterization is required for standard cyclic I/O operation.
Sourcing & Quality Verification
- All units sourced from authorized Siemens distribution channels or verified OEM-surplus with full traceability documentation.
- Each module undergoes incoming inspection: visual check, label verification (date code, firmware revision), and functional power-on test prior to dispatch.
- Original Siemens packaging, holographic labels, and factory serial numbers preserved and verifiable via Siemens Industry Online Support (SIOS).
- Certificate of Conformity (CoC) and test report available upon request for regulated industries.
Procurement Process
- Confirm Part Number: Verify 6ES7972-0AA01-0AX0 matches your BOM or existing hardware configuration in STEP 7 / TIA Portal.
- Request Quote: Contact support@konmask.com for volume pricing, lead time, and availability confirmation.
- Place Order: Submit PO with delivery address; DDP/DAP Incoterms available for international shipments.
- Dispatch & Tracking: Orders dispatched within 1–3 business days; tracking number provided via email.
- Incoming Inspection Support: Our technical team can assist with acceptance testing procedures and STEP 7 integration verification.
Technical FAQ
Q: Is the 6ES7972-0AA01-0AX0 compatible with TIA Portal?
A: Yes. The module is fully supported in TIA Portal V13 and later via the GSD file import. It also remains fully compatible with STEP 7 V5.x Classic.
Q: Can this module be used as a PROFIBUS DP master?
A: No. The IM 306 (6ES7972-0AA01-0AX0) operates exclusively as a DP slave. For DP master functionality, use a CPU with integrated DP interface (e.g., 6ES7315-2AH14-0AB0) or a CP 342-5 communications processor.
Q: What is the maximum cable length for PROFIBUS DP at 12 Mbps?
A: At 12 Mbps, the maximum segment length is 100 m using Siemens PROFIBUS FastConnect cable (6XV1830-0EH10). Repeaters can extend total network length.
Q: Does this module support PROFIBUS PA?
A: No. The 6ES7972-0AA01-0AX0 supports PROFIBUS DP only. For PROFIBUS PA integration, a DP/PA coupler (e.g., 6ES7157-0AC83-0XA0) is required.
Q: What is the difference between 6ES7972-0AA01-0AX0 and 6ES7972-0AA02-0XA0?
A: The -0AA02- revision introduced minor firmware improvements for enhanced diagnostic telegram handling. Both are functionally interchangeable in standard DP slave applications. Consult the Siemens product changelog for detailed revision history.
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