Siemens 6ES7155-6AA01-0BN0 — ET 200SP PROFINET Module Buying Guide

By Abdullah Zahid
12 min read
Siemens 6ES7155-6AA01-0BN0 ET 200SP IM 155-6PN ST PROFINET interface module for distributed I/O systems

Siemens 6ES7155-6AA01-0BN0 SIMATIC ET 200SP PROFINET Bundle Interface Module (IM 155-6PN ST): Specs, Phase-Out Status, and Successor Options

Controls engineers and system integrators searching for the Siemens 6ES7155-6AA01-0BN0 are typically at one of two decision points: validating this interface module for an existing system replacement, or weighing it against the successor model for a new distributed I/O design. This is the IM 155-6PN ST — a PROFINET IRT interface module that connects S7-1500 and S7-1200 PLCs to up to 32 remote ET 200SP I/O modules over a deterministic Ethernet link, with single hot swap capability and a compact DIN rail footprint measuring 12.70 cm x 10.30 cm x 6.50 cm. One critical procurement fact: this model entered phase-out status on October 1, 2024, and stock availability is now distributor-dependent.

If you have already confirmed this is the correct part for your system, check current pricing and stock availability at LeadTime.ca — we ship worldwide.

Who Should Buy the 6ES7155-6AA01-0BN0 — and Who Should Not

This module is the right choice for engineers replacing an existing IM 155-6PN ST in a live system or completing a near-term project where the design is already locked to this catalog number. Qualifying criteria:

  • Your PLC is an S7-1500 or S7-1200 running STEP 7 TIA Portal V14.0 SP1 or later
  • Your site uses PROFINET Ethernet infrastructure and requires deterministic IRT cycle times as low as 1 ms
  • Your application requires support for up to 32 ET 200SP I/O modules and up to 16 ET 200AL modules from a single interface module
  • Single hot swap capability is a hard requirement — module replacement must occur without stopping the production process
  • You are sourcing a replacement unit for an existing installation already designed around this model, not initiating a new multi-year project

If you are specifying this module for a new project with a multi-year lifecycle, the successor model 6ES7155-6AA02-0BN0 is the correct choice and carries active support status. If your plant infrastructure runs legacy PROFIBUS DP rather than PROFINET, a different interface module family applies entirely.

On this page:

What the 6ES7155-6AA01-0BN0 Actually Does in a Distributed I/O System

The Siemens 6ES7155-6AA01-0BN0 is a PROFINET interface module — not a PLC, not a standalone I/O rack, and not a communication gateway that processes logic. Its sole function is to act as the connection hub between a centralized S7-1500 or S7-1200 controller and a distributed bank of up to 32 ET 200SP I/O modules, plus up to 16 ET 200AL modules. It manages communication and I/O synchronization across that PROFINET link, then passes data upstream to the PLC for processing.

The IM 155-6PN ST designation indicates PROFINET IRT (Isochronous Real-Time) support, which delivers deterministic cycle times as low as 1 ms. This makes it viable for synchronized motion control, safety interlocks, and sensor networks where non-deterministic Ethernet would introduce unacceptable jitter. The module ships as a bundle SKU, meaning the RJ45 connectors and mounting hardware are included — a distinction that matters at the ordering stage. The module weighs 0.23 kg and mounts on a standard DIN rail; it carries 48 add-on connectors and requires an external 24 V DC power supply sized for both the interface module and the downstream I/O modules.

Single hot swap capability is one of the defining operational features: individual I/O modules in the ET 200SP backplane can be removed and replaced while the system remains powered and the interface module continues operating. For continuous manufacturing environments, this eliminates the need for a planned shutdown to replace a failed I/O module.

Typical System Architecture: Where This Module Sits in the Signal Chain

The 6ES7155-6AA01-0BN0 occupies the distributed I/O gateway position — it sits between the centralized PLC and the field-level I/O modules, translating PROFINET traffic into backplane I/O data exchange.

  • S7-1500 or S7-1200 PLC (running TIA Portal V14.0 SP1 or later) originates all control logic and issues I/O commands over PROFINET
  • Managed Ethernet switch distributes PROFINET traffic to one or more distributed I/O nodes across the plant or cabinet network
  • 6ES7155-6AA01-0BN0 interface module receives PROFINET traffic via onboard RJ45 connectors and coordinates the backplane data exchange
  • ET 200SP I/O modules (digital input, digital output, analog input, analog output — ordered separately) mount adjacent to the IM on the DIN rail and connect via the internal backplane
  • Field devices (sensors, actuators, motor drives, valves) connect directly to the individual I/O module terminals at the distributed cabinet location

Where Engineers Deploy the IM 155-6PN ST

Automotive body lines use this module to distribute conveyor control, safety interlock monitoring, and sensor networks across multiple machine stations — all managed from a single S7-1500 PLC over a PROFINET backbone. The 1 ms cycle time capability supports the tight synchronization requirements of body-in-white transfer lines.

In pharmaceutical batch processing facilities, the ET 200SP system handles valve actuation, pressure sensing, and level monitoring across physically separated reactor modules. The distributed topology reduces the cable runs required compared to centralized I/O, and the hot swap capability allows sensor module replacement during batch intervals without a full system restart.

Packaging lines running multiple motor drives and proximity or vision sensors rely on the deterministic PROFINET link to synchronize I/O across stations. A single IM 155-6PN ST coordinating up to 32 I/O modules can cover the full sensor and actuator count of a mid-size packaging machine from one distributed node.

Smart factory retrofit projects use the ET 200SP architecture to replace legacy centralized I/O racks with distributed nodes, reducing cabinet footprint and enabling remote I/O monitoring for predictive maintenance programs. Multi-zone warehouses deploy the module at each load-unload gate or conveyor segment, with a centralized PLC managing the full facility over PROFINET.

Application Typical Deployment
Automotive body line Distributed I/O for conveyor control and safety interlocks across machine stations
Pharmaceutical batch processing Valve actuation and sensor monitoring across separated reactor modules
Packaging line Synchronized motor drive and sensor control via single PROFINET link
Smart factory retrofit Distributed nodes replacing centralized I/O racks; enables remote monitoring
Multi-zone warehouse Centralized PLC controlling I/O at each conveyor segment and load-unload gate

Specifications That Drive the Purchase Decision

Parameter Value
Catalog Number 6ES7155-6AA01-0BN0
Protocol PROFINET IRT (Isochronous Real-Time)
Maximum I/O Modules 32 ET 200SP modules + 16 ET 200AL modules
Hot Swap Capability Single hot swap (replacement without stopping system)
Power Supply External 24 V DC (separate supply required)
Physical Dimensions (L x W x H) 12.70 cm x 10.30 cm x 6.50 cm
Weight (without packaging) 0.23 kg
Ethernet Connectivity RJ45 (PROFINET)
Software Compatibility STEP 7 TIA Portal V14.0 SP1 and later; STEP 7 Professional
Product Status Phase-out since October 1, 2024 — Successor: 6ES7155-6AA02-0BN0

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

6ES7155-6AA01-0BN0 vs. 6ES7155-6AA02-0BN0: Which One Do You Actually Need?

Model Protocol Max I/O Modules Hot Swap Price Range (Approximate) Support Status
6ES7155-6AA01-0BN0 PROFINET IRT 32 + 16 ET 200AL Single 209–262 USD Phase-out (Oct 2024)
6ES7155-6AA02-0BN0 (Successor) PROFINET IRT 32 + 16 ET 200AL Single Market-dependent Active support
Classic IM 155-6PN (Legacy) PROFINET 32 No Higher (legacy pricing) Limited support
Third-party PROFINET Gateway PROFINET Varies by vendor Varies Competitive Varies by vendor

For any new project with a multi-year operational lifecycle, the 6ES7155-6AA02-0BN0 is the correct specification — it carries active support status and potential firmware improvements over the phase-out model. If your architecture requires PROFIBUS DP rather than PROFINET due to legacy plant infrastructure, neither of these models applies and a different interface module family is needed. If your application does not justify the networking complexity of distributed I/O, deploying analog and digital I/O modules directly at the PLC may be the simpler path. For replacement of an existing 6ES7155-6AA01-0BN0 installation, check current stock and pricing at LeadTime.ca.

Expert Verdict: Honest Assessment for Engineers and Procurement Teams

The Siemens 6ES7155-6AA01-0BN0 delivers exactly what it is rated for: a reliable PROFINET IRT gateway for ET 200SP distributed I/O, with native TIA Portal integration that reduces engineering overhead for teams already working in the Siemens ecosystem. The 1 ms deterministic cycle time is a real operational advantage for motion control and synchronized safety applications — not a theoretical spec. The single hot swap capability has direct operational value in continuous manufacturing environments where a full system shutdown for a failed I/O module would compromise batch integrity or line throughput. For teams replacing like-for-like in an existing installation, this remains a technically sound choice where stock is available.

The honest limit here is the phase-out status. With this model having entered phase-out on October 1, 2024, any engineer specifying it for a new project is inheriting a shortening support window and increasingly unpredictable lead times as distributor inventory depletes. For new designs, the successor 6ES7155-6AA02-0BN0 is the correct path. There is also a topology reality check worth stating: this module requires PROFINET infrastructure to exist at the site — a managed Ethernet switch capable of deterministic traffic is a prerequisite, not optional. Engineers who order this module without that infrastructure in place create their own commissioning problems.

From a procurement standpoint, the typical lead time for in-stock units from authorized distributors runs 2 to 4 weeks. Phase-out status can extend backorder scenarios to 4 to 8 weeks depending on global inventory. Volume orders or project bundling with ET 200SP I/O modules may affect pricing and lead time. If this matches your replacement 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 DIN rail with adequate clearance for the 6.50 cm module depth and side-by-side ET 200SP I/O modules — verify cabinet width accommodates the full backplane assembly at 12.70 cm length
  • Connect an external 24 V DC power supply to the module terminal block; the power supply must be sized to cover both the interface module and all downstream I/O modules in the backplane
  • Connect PROFINET Ethernet cable (Category 5e or Category 6 shielded recommended for industrial environments) from the managed Ethernet switch to one of the onboard RJ45 connectors; maximum cable run is 100 m per link without a managed switch
  • The bundle SKU includes RJ45 connectors and mounting hardware — do not order these separately; verify bundle contents match the checklist before installation
  • Confirm all backplane connections are fully seated and no connector pins are damaged before energizing; LED status indicators on the module will confirm power and link status at startup

TIA Portal Commissioning Overview

  • Open STEP 7 TIA Portal V14.0 SP1 or later; locate the IM 155-6 PN ST in the Hardware Catalog and drag it into the PROFINET network configuration for the target S7-1500 or S7-1200 PLC
  • Assign a static IP address and subnet mask in the module properties, or confirm DHCP assignment matches your network plan — IP address conflicts are a common commissioning fault
  • Add the required ET 200SP I/O modules (ordered separately) to the available backplane slots and configure each module's I/O mapping and data types within the TIA Portal project
  • Download the complete hardware configuration to the PLC via USB or Ethernet connection; verify that TIA Portal online diagnostics confirm a green communication link between the PLC and the interface module
  • Validate data exchange by toggling a digital output or reading a digital input from the distributed rack before proceeding to full system testing — do not assume communication is active based on LED status alone

What Engineers Get Wrong When Ordering This Part

The following checklist covers the most common ordering errors and compatibility gaps associated with the 6ES7155-6AA01-0BN0. Review every item before placing an order.

  1. Verify the target PLC (S7-1500, S7-1200) supports PROFINET and is running STEP 7 TIA Portal V14.0 SP1 or higher
  2. Confirm PROFINET Ethernet switch or managed switches are deployed at the site to support deterministic traffic
  3. Check that ET 200SP I/O modules (not ET 200S or ET 200AL standalone units) are ordered separately; this module bundles the IM only
  4. Verify cabinet has standard DIN rail and adequate width (typically 12.70 cm L x 10.30 cm W x 6.50 cm H) for backplane mounting
  5. Ensure power supply is separate and sized for both the interface module and I/O modules (typical 24 V DC, external supply required)
  6. Confirm that this is a BUNDLE SKU (includes IM + mounting hardware + RJ45 connectors); do not purchase additional connectors
  7. Review product phase-out status and check if successor model 6ES7155-6AA02-0BN0 is preferred for new projects
  8. Validate that cable runs from PLC to distributed I/O racks do not exceed network topology limits (typically 100 m per link without managed switches)

If any of these checks raise a question about compatibility or project fit, contact the LeadTime.ca team before ordering — or review the full product details on the product page to cross-reference against your system requirements.

Frequently Asked Questions

Can the 6ES7155-6AA01-0BN0 be used with an S7-1200 PLC, or is it S7-1500 only?

The IM 155-6PN ST is compatible with both S7-1500 and S7-1200 PLCs, provided the controller is running STEP 7 TIA Portal V14.0 SP1 or later and the PLC supports PROFINET. Confirm the specific S7-1200 CPU variant supports PROFINET IO controller functionality before specifying this module in an S7-1200 system.

What is the difference between 6ES7155-6AA01-0BN0 and 6ES7155-6AA02-0BN0, and does it matter for a replacement order?

The 6ES7155-6AA01-0BN0 entered phase-out on October 1, 2024; the 6ES7155-6AA02-0BN0 is the active successor. For a direct replacement in an existing system already configured around the 6ES7155-6AA01-0BN0, the current model can be used where stock is available. For any new project or system with a multi-year lifecycle, specify the successor model to avoid support timeline risk.

Does this module support hot swap of the interface module itself, or only the downstream I/O modules?

The single hot swap capability applies to the ET 200SP I/O modules connected to the backplane — individual digital input, output, or analog modules can be replaced while the system remains powered and the interface module continues operating. Hot swapping the interface module itself is a different procedure and typically requires system coordination; consult the Siemens IM 155-6PN ST manual for full details.

Is a managed Ethernet switch required, or can I connect the PLC directly to the interface module?

For simple point-to-point topologies with a single distributed I/O node, a direct connection is possible within the 100 m cable run limit. For larger deployments with multiple distributed nodes, ring topology configurations, or cable runs exceeding 100 m between devices, a managed switch capable of supporting PROFINET deterministic traffic is required. Unmanaged switches are not recommended for PROFINET IRT networks.

What is the realistic lead time for the 6ES7155-6AA01-0BN0 given its phase-out status?

In-stock units from authorized distributors typically ship within 2 to 4 weeks. Phase-out status means global inventory is finite and not being replenished at the same rate as active models; backorder scenarios can extend lead time to 4 to 8 weeks. Expedited procurement may reduce this to 1 to 2 weeks depending on available stock, but availability is not guaranteed. Verify current lead time directly with LeadTime.ca before committing a project schedule.

Does this bundle include the ET 200SP I/O modules, or only the interface module and connectors?

The 6ES7155-6AA01-0BN0 bundle includes the IM 155-6PN ST interface module, RJ45 connectors, and mounting hardware only. ET 200SP I/O modules — digital inputs, digital outputs, analog inputs, analog outputs — are separate catalog items and must be ordered independently based on the specific I/O count and type required for the application.

Price, Lead Time, and How to Order From Anywhere in the World

  • LeadTime.ca ships the Siemens 6ES7155-6AA01-0BN0 worldwide — no regional purchasing restrictions
  • Given phase-out status since October 1, 2024, stock levels are distributor-dependent; the team can confirm real-time availability and current pricing before you commit
  • Volume orders and project bundling with ET 200SP I/O modules may qualify for adjusted pricing — contact directly to discuss
  • Typical lead time for in-stock units runs 2 to 4 weeks; the team can advise on expedited options or recommend the successor model 6ES7155-6AA02-0BN0 for new-build timelines

At-a-Glance Summary

  • Catalog number: 6ES7155-6AA01-0BN0 — SIMATIC ET 200SP PROFINET Bundle Interface Module (IM 155-6PN ST)
  • Protocol: PROFINET IRT with deterministic cycle times as low as 1 ms
  • Maximum capacity: 32 ET 200SP I/O modules plus 16 ET 200AL modules per interface module
  • Hot swap: Single hot swap supported — I/O modules replaceable without stopping the system
  • Power: External 24 V DC supply required; not included in bundle
  • Dimensions: 12.70 cm x 10.30 cm x 6.50 cm; weight 0.23 kg; standard DIN rail mounting
  • Software: STEP 7 TIA Portal V14.0 SP1 or later; STEP 7 Professional; compatible with S7-1500 and S7-1200
  • Bundle contents: IM module + RJ45 connectors + mounting hardware — I/O modules ordered separately
  • Phase-out status: October 1, 2024 — successor model 6ES7155-6AA02-0BN0 recommended for new projects
  • Typical lead time: 2 to 4 weeks in-stock; 4 to 8 weeks on backorder; verify with LeadTime.ca for current availability