Expansion Rack Interface Solution – Siemens 6ES7403-1TA01-0AA0 | SIMATIC S7-400 IM 461-1
Where This Product Is Used
The Siemens 6ES7403-1TA01-0AA0 (IM 461-1) is the receive interface module installed in the expansion rack of a SIMATIC S7-400 system. It works in tandem with the IM 460-x send module in the central rack to establish a high-speed, deterministic backplane link between racks. Typical deployment environments include:
- Large-scale process automation – chemical plants, oil & gas facilities, and power generation stations requiring distributed I/O across multiple racks
- Automotive manufacturing – body-in-white lines and paint-shop conveyors where I/O count exceeds a single rack’s capacity
- Water & wastewater treatment – multi-rack control panels managing pumps, valves, and instrumentation across large sites
- Steel & metals processing – rolling mills and furnace control systems with high-density analog and digital I/O
- Building automation & utilities – central HVAC and power distribution panels with geographically separated sub-racks
Technical Specifications
| Order Number (SKU) | 6ES7403-1TA01-0AA0 |
| Module Designation | IM 461-1 |
| Function | Receive interface module for S7-400 expansion rack |
| Compatible Send Module | IM 460-1 (6ES7460-1BA01-0AB0) – local expansion, no bus extension |
| Max. Expansion Racks | Up to 21 expansion racks per central rack (system-level) |
| Rack Slot | Slot 1 of the ER 400 expansion rack |
| Power Supply | Via backplane bus of the expansion rack |
| Weight | 4,100 g (module + packaging) |
| Product Family | SIMATIC S7-400 |
| Manufacturer | Siemens AG |
| Country of Origin | Germany |
Why Engineers Specify This Model
- Deterministic rack-to-rack communication – the IM 461-1 / IM 460-1 pair uses Siemens’ proprietary high-speed backplane protocol, ensuring cycle-synchronous data exchange with no Ethernet latency variability
- Transparent I/O addressing – all modules in the expansion rack appear in the same address space as the central rack; no additional software mapping required in STEP 7 or TIA Portal
- Hot-swap capable rack architecture – when used with the UR2-H redundant rack, the IM 461-1 supports online module replacement without process interruption
- Proven long-term availability – the S7-400 platform has a documented lifecycle commitment from Siemens, making spare-part planning straightforward for 10–20 year plant horizons
- Simple commissioning – no DIP switches or firmware configuration; the module is recognized automatically by the CPU upon power-up
Complete System Bill of Materials
To build a functional S7-400 central + expansion rack system, the following components are typically required:
- S7-400 Central Rack (e.g., UR2 – 6ES7400-1JA01-0AA0)
- S7-400 Power Supply (e.g., PS 407 – 6ES7407-0DA02-0AA0)
- S7-400 CPU (e.g., CPU 414-3 – 6ES7414-3XM05-0AB0)
- IM 460-1 Send Module in central rack (6ES7460-1BA01-0AB0)
- IM 461-1 Receive Module in expansion rack – 6ES7403-1TA01-0AA0 (this item)
- S7-400 Expansion Rack ER 400 (6ES7400-2JA00-0AA0)
- Expansion Rack Power Supply (e.g., PS 405 – 6ES7405-0DA02-0AA0)
- Signal Modules (SM 321/322/331/332) as required by application
Compliance & Industry Standards
- CE marked – compliant with EU Machinery Directive and EMC Directive
- UL listed for industrial control equipment
- IEC 61131-2 compliant programmable controller hardware
- ATEX / IECEx zone classification available via Siemens Ex-certified variants (consult factory)
- RoHS compliant
Quality Assurance & Sourcing
Konmask.com sources the 6ES7403-1TA01-0AA0 exclusively from verified industrial distributors and authorized channel partners. Every unit undergoes the following before dispatch:
- Visual inspection for physical damage, label integrity, and firmware version verification
- Functional power-on test where applicable
- Original manufacturer packaging retained where available
- Serialization and traceability records maintained per shipment
We do not sell counterfeit, refurbished-as-new, or grey-market product. All items are supplied with a 12-month Konmask warranty against defects in materials and workmanship.
How to Source This Part
- Add to cart directly on this page for in-stock units
- Request a quote for volume orders (>5 units) – email support@konmask.com with your required quantity and delivery timeline
- Lead time: In-stock orders ship within 1–3 business days; ex-stock orders typically 2–4 weeks depending on origin
- Export documentation: Commercial invoice, packing list, and certificate of origin available upon request for customs clearance
Application-Specific FAQ
Q: Can the 6ES7403-1TA01-0AA0 be used with any S7-400 CPU?
A: Yes. The IM 461-1 is compatible with all S7-400 CPUs. The send module (IM 460-1) is installed in the central rack; the IM 461-1 is installed in the expansion rack. No CPU-specific configuration is required.
Q: What is the maximum cable distance between central and expansion rack?
A: The IM 460-1 / IM 461-1 pair supports local expansion only (same cabinet or adjacent cabinet, typically ≤1 m). For longer distances, use the IM 460-3 / IM 461-3 pair with fiber-optic cable (up to 100 m).
Q: Is this module compatible with TIA Portal?
A: Yes. The S7-400 hardware, including the IM 461-1, is fully supported in TIA Portal V13 and later via the S7-400 hardware catalog.
Q: Can I mix S7-400 and S7-300 modules in the same expansion rack?
A: No. The S7-400 expansion rack (ER 400) accepts only S7-400 signal modules. S7-300 modules use a different backplane bus and are not interchangeable.
Q: What happens if the IM 461-1 fails during operation?
A: The CPU will detect the rack communication fault and generate a diagnostic interrupt. In redundant configurations (H-system), the standby CPU takes over. For non-redundant systems, the affected expansion rack I/O will go offline until the module is replaced.
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