Siemens 6ES7156-0AA01-0XA0 SIMATIC DP/AS-Interface Link 20 M Gateway
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Product Information
The Siemens 6ES7156-0AA01-0XA0 is a SIMATIC DP/AS-Interface Link 20 M communication gateway module within the SIMATIC S7 family. It connects higher-level PROFIBUS DP control architectures directly to lower-level AS-Interface fieldbus networks. Housed in a compact IP20-rated enclosure, this gateway operates as an AS-Interface master while drawing its primary operating power directly from the 30 V DC (26.5 to 31.6 V DC) AS-Interface voltage line with a nominal current consumption of 0.15 A.
Integrating a replacement unit into an existing installation requires establishing physical bus lines and configuring network parameters. On the PROFIBUS DP side, the 6ES7156-0AA01-0XA0 functions as a standard DPV0/DPV1 slave supporting automatic baud rate detection up to 12 Mbit/s. On the AS-Interface side, the unit manages up to 62 A/B addressed slaves or 31 standard slaves in accordance with AS-Interface Specification 2.11. Commissioning a replacement spare typically involves setting the PROFIBUS slave address and downloading the hardware configuration via Siemens STEP 7 (V5.1 SP2 or higher) or using GSD files when integrating into non-Siemens PLC environments. Pre-configuring fieldbus addresses and restoring parameter sets ensure the replacement unit correctly maps connected field devices. Expert support from ABC Industrial Parts can assist in verifying hardware configuration alignment before putting a spare gateway online.
System diagnostics are available directly on the module's front panel through dedicated status LEDs, as well as through PROFIBUS DP diagnostic telegrams and the STEP 7 HW Config diagnostic buffer. The module monitors system status continuously, indicating normal execution with the green ON / RUN LED, while reporting PROFIBUS communication issues via the red BF LED, AS-Interface voltage drops via the red APF LED, fieldbus configuration mismatches via the yellow CER LED, and wiring ground faults via the yellow AEF LED. A solid red SF LED signals an internal system hardware failure or EEPROM error. Because internal hardware or memory failures cannot be repaired in the field, sourcing a tested exchange unit or utilizing professional repair through ABC Industrial Parts provides a direct route to restoring system operation.
Technical Specifications
| Manufacturer | Siemens |
| Part Number | 6ES7156-0AA01-0XA0 |
| Model / Type | DP/AS-Interface Link 20 M |
| Product Family | SIMATIC S7 |
| Component Type | Communication Gateway Module |
| Supply Voltage | 30 V DC (26.5 to 31.6 V DC) |
| Current Consumption | 0.15 A |
| AS-Interface Specification | 2.11 |
| Maximum AS-Interface Slaves | 62 A/B or 31 standard slaves |
| Maximum PROFIBUS Baud Rate | 12 Mbit/s |
| Protection Rating | IP20 |
Programming and Configuration
The 6ES7156-0AA01-0XA0 gateway is configured within the SIMATIC automation environment using Siemens STEP 7 software version V5.1 SP2 or higher. Through STEP 7 HW Config, engineers define the PROFIBUS DP node address, configure the AS-Interface slave organization, and set operating parameters. When integrated into third-party control systems, system setup is managed using standard GSD files, allowing non-Siemens PROFIBUS masters to communicate seamlessly with the gateway.
Proper commissioning requires aligning the logical slave network configured in software with the physical devices detected on the AS-Interface cable. The gateway supports up to 62 A/B slaves or 31 standard slaves adhering to AS-Interface Specification 2.11. Restoring a system after gateway replacement involves transferring the verified HW Config project to the PROFIBUS master, ensuring the slave address, baud rate up to 12 Mbit/s, and slave mapping match the field installation exactly.
Communication and System Integration
The Siemens 6ES7156-0AA01-0XA0 functions as a dual-interface gateway module, bridging PROFIBUS DP networks to AS-Interface sensor and actuator lines. On the primary control side, it acts as a high-speed PROFIBUS DP slave capable of automatic baud rate detection up to 12 Mbit/s. This allows central controllers, such as SIMATIC S7-300 or S7-400 PLCs, to access fieldbus data transparently across standard DP lines.
On the field level, the module acts as an AS-Interface master operating under Specification 2.11. It consolidates binary sensors and actuators into a single PROFIBUS DP node address, significantly reducing cabinet wiring complexity. Operating directly from the AS-Interface line voltage (30 V DC nominal), the unit eliminates the need for separate external auxiliary power connections, streamlining fieldbus infrastructure in distributed packaging, material handling, and automotive production environments.
Diagnostics and Status Indication
Diagnostics for the 6ES7156-0AA01-0XA0 are handled through visual front-panel LED indicators and software-based reporting tools. System engineers can retrieve detailed standard and extended diagnostic telegrams over PROFIBUS DP or read the diagnostic buffer directly in STEP 7 HW Config to pinpoint operational errors across connected field devices.
Six dedicated front-panel status LEDs provide instant visual feedback on operational state and faults. These include indicators for internal hardware status, bus communication, line power sufficiency, topology configuration consistency, and ground isolation errors on the AS-Interface bus.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| SF | Red - Solid | System Fault: Internal hardware failure or EEPROM error |
| BF | Red - Solid | Bus Fault: Communication error on PROFIBUS DP |
| APF | Red - Solid | AS-i Power Fail: AS-Interface voltage missing or below threshold |
| CER | Yellow - Solid | Configuration Error: Mismatch between configured topology and actual detected slaves |
| AEF | Yellow - Solid | AS-i Earth Fault: Ground fault detected on AS-Interface wiring |
| ON / RUN | Green - Solid | Operating State: Power supply active and AS-i link in normal operating status |
Replacement and Spare Part Considerations
When replacing a legacy 6ES7156-0AA01-0XA0 gateway, maintenance teams must confirm that the replacement unit shares identical fieldbus parameters and PROFIBUS node settings. Because the unit acts as an AS-Interface V2.11 master managing up to 62 A/B slaves, any mismatch between the expected slave configuration in the PLC and the connected physical slaves will result in a configuration error.
Although Siemens has designated the 6GK1415-2AA10 as the official successor model, maintaining an exact 6ES7156-0AA01-0XA0 replacement spare ensures direct hardware drop-in compatibility without requiring physical panel modifications or software reconfiguration. Prior to powering up the spare, verify that the AS-Interface power supply delivers the required 30 V DC nominal line voltage and that all PROFIBUS connectors are firmly seated.
Frequently Asked Questions
What is the primary function of the Siemens 6ES7156-0AA01-0XA0?
The Siemens 6ES7156-0AA01-0XA0 is a communication gateway module that links PROFIBUS DP networks to AS-Interface fieldbus networks, allowing a central PLC to control up to 62 AS-Interface devices via a single PROFIBUS DP address.
Which programming software is required to configure this gateway?
Configuration is performed using Siemens STEP 7 version V5.1 SP2 or higher. When integrating into non-Siemens controllers, integration is achieved using standard GSD files.
Does the 6ES7156-0AA01-0XA0 module require an external power supply?
No external auxiliary power supply is needed. The module draws its operating power directly from the connected AS-Interface cable (30 V DC nominal).
How many field devices can be connected to the gateway?
Under AS-Interface Specification 2.11, the gateway supports up to 62 A/B addressed slaves or up to 31 standard slaves.
What does a solid red SF LED indicate?
A solid red System Fault (SF) LED indicates an internal hardware failure or an EEPROM error within the module.
What is the recommended successor model for the 6ES7156-0AA01-0XA0?
Siemens designates the 6GK1415-2AA10 as the recommended successor model.
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