Siemens 6ES7155-5AA00-0AC0 Replacement for ET 200S

Product Overview

Siemens 6ES7155-5AA00-0AC0 Replacement for ET 200S: Seamless PROFINET Migration & Upgrade Solution

The Siemens 6ES7155-5AA00-0AC0 is the IM 155-5 PN ST (Interface Module 155-5 PROFINET Standard) for the SIMATIC ET 200S distributed I/O system. As legacy SIMATIC S7-300 and early ET 200S installations approach end-of-life, plant engineers and procurement teams face increasing pressure to source verified replacement units or plan structured migration paths to current-generation platforms. TOPNLMS maintains ready stock of the 6ES7155-5AA00-0AC0 to support both emergency replacement and planned retrofit projects, with each unit tested prior to dispatch and covered by a 12-month warranty.

Whether your facility is running a distributed I/O network tied to a SIMATIC S7-315-2 PN/DP or S7-317-2 PN/DP CPU, or you are migrating toward a SIMATIC S7-1500 architecture with ET 200SP remote I/O stations, the 6ES7155-5AA00-0AC0 remains a critical bridging component. Its PROFINET IO Device interface allows it to communicate directly with any PROFINET-capable controller, preserving your existing network topology and minimizing re-engineering effort during the transition period.

Compatibility Comparison Table

Seamless Upgrade Solutions

A successful ET 200S station migration involves more than swapping the interface module. During retrofit projects, engineers typically address the full station bill of materials in parallel. The 6ES7155-5AA00-0AC0 interfaces directly with the ET 200S power module — commonly the 6ES7138-4CA01-0AA0 PM-E DC 24V — which supplies the electronic modules downstream. If the power module is also aging, replacing it alongside the IM reduces the risk of a secondary failure shortly after commissioning the new interface module.

On the I/O side, digital input modules such as the 6ES7131-4BF00-0AA0 (4DI × 24VDC) and digital output modules like the 6ES7132-4BF00-0AA0 (4DO × 24VDC/0.5A) are frequently refreshed during the same maintenance window. Their terminal modules — the 6ES7193-4CA40-0AA0 TM-E series — remain reusable across module generations, which significantly reduces rewiring labor and preserves existing cable schedules.

For analog signal chains, the 6ES7134-4GB11-0AB0 analog input module (4AI, ±10V/0–20mA) is a common companion in process control cabinets. Where signal isolation is required between field instruments and the ET 200S backplane — particularly in environments with ground loops or high common-mode noise — inline signal isolators or the Siemens 6ES7338-4BC01-0AB0 SM 338 position input module may be incorporated into the upgrade scope.

Communication continuity is equally important. If the upstream controller is a SIMATIC S7-315-2 PN/DP CPU with an existing PROFINET ring topology, the 6ES7155-5AA00-0AC0’s integrated 2-port switch supports Media Redundancy Protocol (MRP), allowing the ET 200S station to participate in a redundant ring without additional network hardware. For sites transitioning to S7-1500 controllers, the same GSDML device description file used with the 6ES7155-5AA00-0AC0 is compatible with TIA Portal’s hardware configuration, making the controller-side migration straightforward.

Where HMI integration is part of the upgrade scope, SIMATIC HMI TP700 Comfort or KTP700 Basic panels connected via PROFINET to the same subnet as the ET 200S station require no additional configuration changes — the IM 155-5 PN ST is transparent to the HMI communication layer. Programming cables such as the 6GK1571-0BA00-0AA0 PC adapter USB are used during commissioning to connect the engineering workstation to the PROFINET network for online diagnostics and firmware updates.

Retrofit Guidance FAQ

Q: Can I replace an IM 151-3 PN (PROFIBUS) with the 6ES7155-5AA00-0AC0 without rewiring the field terminals?
A: The terminal modules (TM-E series) and I/O electronic modules remain in place. Only the interface module itself is swapped. However, the network cable changes from PROFIBUS (9-pin Sub-D) to PROFINET (RJ45 Ethernet), so a new network drop to the cabinet is required. The field wiring on terminal modules is unaffected.

Q: Do I need to update my STEP 7 project or TIA Portal hardware configuration?
A: Yes. The 6ES7155-5AA00-0AC0 uses a GSDML file for device description. In TIA Portal, delete the old IM from the hardware configuration, insert the new IM 155-5 PN ST from the hardware catalog (or import the GSDML), and re-assign the I/O modules. The I/O addresses can be preserved if you manually assign them to match the original configuration, minimizing changes to the PLC program.

Q: Is the 6ES7155-5AA00-0AC0 compatible with PROFINET MRP (Media Redundancy Protocol)?
A: Yes. The integrated 2-port switch supports MRP client mode, allowing the ET 200S station to participate in a PROFINET ring topology for network redundancy. The ring manager function must be assigned to the controller or a managed switch.

Q: What is the physical installation space requirement?
A: The IM 155-5 PN ST occupies the standard ET 200S interface module slot on a DIN rail-mounted terminal module. Its dimensions are identical to other ET 200S interface modules, so no cabinet modification or additional DIN rail space is required.

Q: Can the module be used with a third-party PROFINET controller (non-Siemens)?
A: Yes. The 6ES7155-5AA00-0AC0 is a standard PROFINET IO Device and can be integrated with any PROFINET IO Controller that supports the GSDML-based device description, including controllers from Rockwell, Beckhoff, Mitsubishi, and others.

Q: How do I perform online diagnostics after installation?
A: Connect the engineering workstation to the PROFINET network. In TIA Portal, use the “Online & Diagnostics” view to check module status, read diagnostic buffers, and verify I/O communication. The module supports PROFINET system redundancy diagnostics and LED status indicators (RUN, ERROR, MAINT) for local fault identification.

Warranty Assurance

Every 6ES7155-5AA00-0AC0 unit shipped by TOPNLMS is covered by a 12-month warranty against functional failure under normal operating conditions. Prior to dispatch, each module undergoes a functional verification check including power-on self-test and communication interface validation. Units are packed in anti-static ESD-safe packaging with original or equivalent protective inserts to prevent transit damage.

In the event of a warranty claim, TOPNLMS provides a replacement unit or full refund within the warranty period. Our after-sales response target is within 24 hours of a confirmed fault report. Replacement units are dispatched from our Xiamen warehouse with priority shipping to minimize your plant downtime. We maintain buffer stock of high-demand ET 200S components specifically to support rapid warranty replacements without lead-time delays.

For procurement teams requiring documentation, we can provide a test report, packing list, and commercial invoice with HS code declaration for customs clearance. Bulk orders for MRO (Maintenance, Repair & Operations) inventory programs are supported with volume pricing and scheduled delivery agreements.

Contact our technical sales team to confirm compatibility with your specific system configuration before ordering, or to request a quotation for a complete ET 200S station refresh.