Siemens dl1155-6au00-0pm0

By Abdullah Zahid
12 min read
Siemens 6DL1155-6AU00-0PM0 PROFINET Interface Module IM 155-6 PN HA for ET 200SP HA distributed I/O system

Siemens 6DL1155-6AU00-0PM0 PROFINET Interface Module IM 155-6 PN HA — Specifications, Selection Guide, and Sourcing

Controls engineers specifying distributed I/O for high-availability process applications face a binary choice: accept the downtime risk of conventional interface modules, or invest in hardware built around the assumption that production never stops. The Siemens 6DL1155-6AU00-0PM0 — the SIMATIC ET 200SP HA PROFINET Interface Module IM 155-6 PN HA — is the answer for the second camp. It connects up to 56 I/O modules to a controller via PROFINET IO with a minimum update time of 250 microseconds, supports multi-hot swap without system interruption, and carries ATEX Zone 2 and IECEx certification for hazardous area installations. If you are at the point of confirming this is the right part, check current pricing and availability for the 6DL1155-6AU00-0PM0 at LeadTime.ca — ships worldwide.

Who Should Buy the 6DL1155-6AU00-0PM0 — and Who Shouldn't

This module is the correct choice when your application demands communication reliability and maintenance flexibility that standard distributed I/O cannot provide. Buy the 6DL1155-6AU00-0PM0 when all of the following are true:

  • Your network protocol is PROFINET IO — not PROFIBUS DP, EtherCAT, or IO-Link
  • Your system requires multi-hot swap capability for unplanned module replacement without halting production
  • You need System Redundancy S2, R1, or Media Redundancy Protocol (MRP) support in the same interface module
  • Your I/O count stays within 56 modules and all modules are explicitly specified as ET 200SP HA variants
  • Your deployment environment falls within -25°C to +60°C and IP20 protection class is adequate
  • Your facility requires ATEX Zone 2 or IECEx certification for hazardous area compliance

If your application is non-critical, budget-constrained, or does not require redundancy, the standard ET 200SP interface modules offer a lower-cost entry point. If you need fewer than 56 I/O slots in a space-limited panel, a compact interface module may reduce cost and footprint without sacrificing performance.

On this page:

What the 6DL1155-6AU00-0PM0 Actually Does in a Running System

The 6DL1155-6AU00-0PM0 is the communication gateway for the SIMATIC ET 200SP HA distributed I/O family. Its job is to connect up to 56 downstream I/O modules — handling discrete signals, analog loops, temperature inputs, and other field-level data — to a PLC or process controller via PROFINET IO. The minimum update time of 250 microseconds keeps the module viable in fast-cycle process automation where communication latency directly affects control loop performance.

What separates this module from a standard PROFINET interface is the HA designation. Multi-hot swap allows any I/O module in the station to be pulled and replaced during live system operation without a power cycle or controller stop. Facilities implementing this capability in continuous process environments have reported recovering 8 to 10 hours of annual production time that would otherwise be lost to planned maintenance windows. Combined with System Redundancy S2 standby failover, System Redundancy R1 load-sharing, and Media Redundancy Protocol (MRP) at the network level, the 6DL1155-6AU00-0PM0 provides a layered availability architecture that non-HA interface modules structurally cannot replicate.

Integrated diagnostics provide real-time monitoring of communication status, device health, and fault conditions. LED indicators on the front panel reflect operating state, error flags, and maintenance alerts. Diagnostic messages are accessible via PROFINET IO, so fault data reaches the controller and SCADA layer without requiring a technician to walk the panel floor. For pharmaceutical, food processing, and chemical applications where audit trails and traceability matter, this level of built-in observability is often a compliance requirement rather than a feature preference.

Where the 6DL1155-6AU00-0PM0 Sits in a Typical PROFINET System

The 6DL1155-6AU00-0PM0 sits at the field-level boundary of the control architecture — it is the node that translates PROFINET IO traffic from the controller into module-level communication with individual I/O cards stacked on the same DIN rail.

  • PLC or process controller (S7-1500, S7-400H, or compatible PROFINET IO controller) communicates over Ethernet to the 6DL1155-6AU00-0PM0 via the BusAdapter RJ45 connection
  • The interface module manages communication timing, module health, and redundancy switchover for all downstream I/O modules in the ET 200SP HA station
  • Up to 56 ET 200SP HA I/O modules stack to the right of the interface module on the DIN rail, each handling discrete, analog, or specialty field signals
  • Field devices — sensors, actuators, transmitters, valves, motor starters — wire into the I/O modules at terminal level
  • In a redundant topology, a secondary 6DL1155-6AU00-0PM0 mirrors the primary, with MRP providing ring-based network fault tolerance and S2 or R1 handling controller-level failover

Industries and Applications Where This Module Gets Specified

Food and beverage processing lines running 24/7 represent one of the clearest fits for the 6DL1155-6AU00-0PM0. When a filling or pasteurization line cannot stop for scheduled I/O maintenance, multi-hot swap converts what would be a planned shutdown into a live module swap that takes minutes rather than hours. The IP20 protection class is adequate for most dry food processing environments, though washdown zones require enclosure protection at a higher IP rating.

Pharmaceutical manufacturing relies on this module for redundant I/O networks where both communication reliability and data traceability are regulatory requirements. Shared Device mode, available from firmware v1.1 onward, allows multiple controllers to access the same I/O station — useful in batch processes where a primary automation controller and a supervisory safety system both need visibility into the same field signals.

Chemical batch processes benefit from the real-time diagnostic capability. When a temperature transmitter or valve actuator develops a fault, the diagnostic message reaches the controller immediately rather than waiting for the next scan or a manual inspection round. ATEX Zone 2 and IECEx certification extend the module's reach into areas classified for flammable gas atmospheres, covering oil and gas processing, solvent handling, and petrochemical applications.

Retrofit projects migrating from legacy PROFIBUS installations to PROFINET find the 6DL1155-6AU00-0PM0 a technically sound upgrade path. The 250-microsecond minimum update time provides substantially faster cycle times than typical PROFIBUS DP implementations, and the redundancy architecture can be configured to match or exceed the availability level of the legacy system.

Application Typical Deployment
Food and beverage processing 24/7 filling and pasteurization lines requiring hot-swap I/O maintenance without production stop
Pharmaceutical manufacturing Redundant I/O networks with Shared Device mode for compliance and traceability in clean rooms
Chemical batch processing Real-time diagnostics and module-level health monitoring for reactive and hazardous process control
Oil and gas processing ATEX Zone 2 / IECEx certified installations in flammable gas classified areas
Water and wastewater treatment Multi-zone decentralized I/O with MRP network redundancy for uninterrupted process control
PROFIBUS to PROFINET retrofit Upgrading legacy distributed I/O to 250-microsecond PROFINET update times with redundancy

Purchase-Decision Specifications for the 6DL1155-6AU00-0PM0

Parameter Specification
Supply Voltage 24 V DC (SELV/PELV) via carrier module
Communication Protocol PROFINET IO
Minimum Update Time 250 microseconds
Maximum I/O Modules 56
Dimensions (W x H x D) 35 x 117 x 74 mm
Weight 0.221 kg
Operating Temperature -25°C to +60°C
Protection Class IP20
Redundancy Support System Redundancy S2, R1; Media Redundancy Protocol (MRP)
Certifications CE, UL, ATEX Zone 2, IECEx, EN 61131-2

Full technical specifications are available on the product page at LeadTime.ca.

6DL1155-6AU00-0PM0 vs. Other ET 200SP HA Interface Options

Module Protocol Max I/O Modules Redundancy Support Hot-Swap Best Fit
6DL1155-6AU00-0PM0 (IM 155-6 PN HA) PROFINET IO 56 S2, R1, MRP Multi-hot swap Mission-critical, high-availability process automation
ET 200SP (non-HA) Interface Module PROFINET IO Varies by model Limited or none No multi-hot swap Non-critical applications; cost-driven installations
ET 200S Interface Module (IM 153-2) PROFIBUS DP Fewer slots Limited No Legacy PROFIBUS systems; migration to PROFINET recommended

If your architecture requires PROFINET IO with full S2 and MRP redundancy and up to 56 I/O modules, the 6DL1155-6AU00-0PM0 is the correct choice — check current availability and pricing at LeadTime.ca.

Expert Verdict: Honest Assessment for Engineers Evaluating This Part

The 6DL1155-6AU00-0PM0 delivers on its core promise: a PROFINET interface module that does not require a system shutdown for module maintenance. The 250-microsecond minimum update time, 56-module capacity, and layered redundancy options — S2 standby, R1 load-sharing, and MRP at the network level — make it a technically sound specification for any process where an I/O station outage translates directly into production loss. ATEX Zone 2 and IECEx certification broadens the installation envelope to hazardous gas areas, which removes a common sourcing barrier for oil and gas and chemical applications. The dimensions of 35 x 117 x 74 mm keep the module compact on a standard 35 mm DIN rail, and the -25°C to +60°C operating temperature range covers most industrial outdoor and near-process enclosure environments.

Where the 6DL1155-6AU00-0PM0 is not the right answer: it carries a cost premium over standard ET 200SP modules, and that premium is only justified when redundancy or hot-swap functionality is genuinely required. Applications with no availability requirement and a tight capital budget will overpay for capability they will never use. The IP20 protection class also means this module cannot be mounted in open or wash-down environments without additional enclosure protection — a constraint that eliminates it from certain food processing and marine installations without further engineering. Additionally, note that the BusAdapter (6DL1193-6AR00-0AA0 or equivalent) is not included in delivery and must be ordered as a separate line item — a sourcing detail that has delayed more than a few projects.

From a procurement standpoint, the 6DL1155-6AU00-0PM0 is available from authorized distributors typically within 2 to 4 weeks for new stock. Surplus and refurbished units with test certification are often available for faster shipment. Volume orders of 10 or more units generally qualify for pricing discussions. If this module matches your system requirements, view current stock and pricing at LeadTime.ca.

For volume pricing or to confirm lead time before committing to a build, contact the LeadTime.ca team directly — we ship worldwide.

Wiring and Installation Overview

  • Mount the interface module on a standard 35 mm DIN rail; leave approximately 50 mm clearance behind the module for BusAdapter connection and cable routing
  • Connect the 24 V DC SELV/PELV power supply plug (included in delivery) to the carrier module; do not pull or plug the interface when the supply voltage connector is already inserted
  • Install the BusAdapter (ordered separately — 6DL1193-6AR00-0AA0 or equivalent) and connect RJ45 PROFINET cables; in redundant topologies, both network ports are active for MRP ring configuration
  • Observe front-panel LED status after power-up: green indicates normal operating state; amber or red indicates a diagnostic alert requiring review against the manufacturer diagnostic messages table
  • Load hardware configuration using Siemens STEP 7 or TIA Portal (HW Config); commission redundancy mode if required and verify firmware version supports Shared Device mode (v1.1 and later) before enabling it

Required Accessories and Compatible System Components

The 6DL1155-6AU00-0PM0 requires the following accessories to complete a functional installation. None of these are included in the base module delivery and all must appear as separate line items on the purchase order.

  • BusAdapter 6DL1193-6AR00-0AA0 — 2x RJ45 PROFINET network adapter; required for any PROFINET IO connection; the interface module cannot communicate without it
  • BusAdapter 6DL1193-6AR00-0PM0 — alternative BusAdapter variant; verify correct suffix for your network topology before ordering
  • Carrier module — ET 200SP HA carrier rail; provides the 24 V DC SELV/PELV power path and mechanical stacking connection for I/O modules
  • 24 V DC SELV/PELV power supply — must be sized for total current draw of the interface module and all connected I/O modules; calculate total load in HW Config before specifying supply rating
  • ET 200SP HA I/O modules — must be explicitly designated ET 200SP HA in part number; standard ET 200SP modules are not cross-compatible with the HA interface module

What Engineers Get Wrong When Ordering This Module

The following checklist captures the most consequential ordering and installation errors associated with the 6DL1155-6AU00-0PM0. Review each item against your current bill of materials before submitting a purchase order.

  1. Confirm protocol is PROFINET IO (not PROFIBUS DP, EtherCAT, or IO-Link)
  2. Verify BusAdapter is ordered separately (6DL1193-6AR00-0AA0 or equivalent RJ45 variant)
  3. Check that carrier module and 24 V DC power supply are already specified in system design
  4. Confirm maximum I/O slot count needed does not exceed 56 modules
  5. Verify application does not require integrated server module (this part does not include one)
  6. Ensure operating temperature range of -25°C to +60°C matches deployment environment
  7. Check IP20 protection class is adequate (not suitable for washdown or wet environments)
  8. Confirm ATEX/IECEx certifications match facility regulatory requirements if hazardous area rated

If any item on this checklist raises a question, contact the LeadTime.ca team before ordering — our team reviews I/O topologies before quoting to prevent compatibility issues downstream.

Frequently Asked Questions

Does the 6DL1155-6AU00-0PM0 include the BusAdapter in the delivery?

No. The BusAdapter must be ordered separately. The 6DL1193-6AR00-0AA0 is the standard 2x RJ45 variant for PROFINET IO connectivity. Omitting this from the purchase order is the most common sourcing mistake and typically results in a 2 to 4 week project delay while waiting for the adapter to ship. Always include the BusAdapter as a separate line item on the same order.

Can I mix standard ET 200SP I/O modules with the 6DL1155-6AU00-0PM0 HA interface module?

No. The ET 200SP HA and standard ET 200SP are different hardware platforms with incompatible stacking connectors and firmware. Only I/O modules explicitly designated as ET 200SP HA in their part number and datasheet are compatible. Attempting to mix platforms results in modules that fail to initialize and communication errors that are difficult to diagnose without consulting the compatibility matrix in the system manual.

How many I/O points can a single 6DL1155-6AU00-0PM0 station support?

The interface module supports a maximum of 56 I/O modules. Depending on the module type selected, each ET 200SP HA I/O module typically handles 7 to 14 I/O points, putting the practical station capacity at approximately 400 to 800 discrete I/O points. Analog and specialty modules will have lower point counts per module. Plan for future expansion within the 56-module limit when sizing the station.

What is the difference between System Redundancy S2 and R1 on the 6DL1155-6AU00-0PM0?

System Redundancy S2 is a standby configuration where one interface module acts as primary and a second acts as backup, with automatic failover if the primary loses communication. System Redundancy R1 is a load-sharing configuration where both modules actively participate in I/O communication simultaneously. MRP (Media Redundancy Protocol) operates at the network level, providing ring-based fault tolerance independent of S2 or R1 controller-level redundancy. The three modes can be combined for layered protection in mission-critical installations.

What firmware version is required for Shared Device mode on the 6DL1155-6AU00-0PM0?

Shared Device mode — which allows multiple PROFINET IO controllers to access the same ET 200SP HA station simultaneously — requires firmware version 1.1 or later on the 6DL1155-6AU00-0PM0. Verify the firmware version on any module sourced from stock or surplus inventory before enabling this feature in TIA Portal or HW Config.

Is the 6DL1155-6AU00-0PM0 suitable for outdoor or washdown installations?

The module carries an IP20 protection class, which is rated for control panel installations with incidental contact protection only. It is not suitable for washdown, outdoor exposure, or wet process environments without additional enclosure protection rated to a higher IP class. For applications in food processing washdown zones or outdoor field enclosures, verify that the enclosure itself provides the required protection and that ventilation does not compromise the IP rating of the installation.

Why Engineers and Procurement Teams Order From LeadTime.ca

  • Global shipping — LeadTime.ca sources and ships the 6DL1155-6AU00-0PM0 and compatible accessories worldwide, with no regional restrictions
  • Multi-channel inventory — new, refurbished, and surplus stock options provide flexibility for projects with urgent delivery requirements or strict budget constraints
  • Pre-order compatibility review — our team reviews I/O topology and accessory lists before quoting to catch BusAdapter omissions, power supply sizing issues, and module compatibility gaps
  • Volume pricing — orders of 10 or more units qualify for pricing discussions; contact us before submitting a large purchase order
  • Technical documentation access — datasheets, manuals, and configuration references available at the time of order, not after delivery

At-a-Glance Summary

  • Module: Siemens 6DL1155-6AU00-0PM0 — SIMATIC ET 200SP HA PROFINET Interface Module IM 155-6 PN HA
  • Protocol: PROFINET IO with minimum update time of 250 microseconds
  • Capacity: Up to 56 ET 200SP HA I/O modules per station
  • Redundancy: System Redundancy S2 (standby), R1 (load-sharing), and MRP (media redundancy) all supported
  • Hot-swap: Multi-hot swap module replacement without system interruption or power cycle
  • Dimensions: 35 x 117 x 74 mm; weight 0.221 kg; DIN rail mounting on standard 35 mm rail
  • Operating temperature: -25°C to +60°C; storage -25°C to +70°C
  • Protection class: IP20 — not suitable for washdown without additional enclosure
  • Certifications: CE, UL, ATEX Zone 2, IECEx, EN 61131-2
  • Power: 24 V DC SELV/PELV via carrier module; BusAdapter (6DL1193-6AR00-0AA0) must be ordered separately
  • Shared Device mode: Available from firmware v1.1 and later
  • Availability: Typically 2 to 4 weeks new stock; surplus units often available for faster shipment