How-To Guide  ·  Siemens ET 200S  ·  PROFINET Interface Module

IM 151-3 PN HF (6ES7151-3BA23-0AB0): ET 200S System, Wiring, Configuration & ET 200SP Migration

Part Number: 6ES7151-3BA23-0AB0  ·  SIMATIC ET 200S · PROFINET IO HIGH FEATURE · 2-port switch · Up to 63 modules

1. ET 200S System Overview

The SIMATIC ET 200S is a discretely modular, IP 20 distributed I/O system for PROFIBUS DP and PROFINET IO. A station consists of a head-end interface module followed by a sequence of terminal modules (TMs) onto which electronic modules (EMs) and power modules (PMs) are plugged. Up to 63 modules can be operated behind a single IM 151-3 PN HF, with a 2 m maximum rear-panel-bus length and 256 bytes of cyclic I/O address space.

The IM 151-3 PN HIGH FEATURE sits at the left end of the rail and is the bridge between the PROFINET IO network and the rear-panel bus that feeds every downstream module. Article number 6ES7151-3BA23-0AB0 identifies the high-feature variant; it is a 60 mm wide, 24 VDC powered head module with a 2-port integrated PROFINET switch, an RJ45 connector per port, and a SIMATIC Micro Memory Card slot for storing the device name and firmware.

ET 200S Interface Module Family

2. Article Number Breakdown: 6ES7151-3BA23-0AB0

The Siemens MLFB (machine-readable order designation) for this module decodes as follows:

Sibling article numbers in the same generation: 6ES7151-3AA23-0AB0 = IM 151-3 PN STANDARD (copper, no HF features); 6ES7151-3BA23-0AB0 = IM 151-3 PN HIGH FEATURE (copper, this module); 6ES7151-3BB23-0AB0 = IM 151-3 PN FO (fiber-optic high-feature).

3. HF vs. ST vs. FO Feature Comparison

All three IM 151-3 PN variants share the same physical footprint, the same 24 VDC supply, and the same maximum quantity structure (63 modules, 256 bytes I/O). They differ in network media and, in the case of the HF, in two extra functions: PROFIenergy and PROFIsafe-related fail-safe handling. The table below pulls every published feature line straight from the three module manuals.

4. System Assembly Architecture

ET 200S follows a strict left-to-right assembly pattern on a 35 mm DIN rail (per EN 60715). Modules are not freely-swappable into arbitrary slots like a 1756 ControlLogix chassis — instead each terminal module is hooked onto the rail, slid leftward against the previous one, and the matching electronic or power module is then plugged onto its face.

Mandatory Order on the Rail

Power Modules and Potential Groups

Every TM-P terminal module on the rail opens a new potential group. The downstream electronic modules in that potential group all draw their sensor and load supply from the PM-E plugged onto that TM-P. To switch a section of the station to a different load voltage, or to galvanically separate one section from the next, you simply place another TM-P + PM-E pair at that point.

A TM-P also exposes the AUX1 bus — an auxiliary potential rail that runs parallel to the P1/P2 power buses and can carry a separate voltage (up to 230 VAC/DC, 10 A at 60 deg C) for protective-conductor distribution or supplemental supplies. Per the ET 200S system manual: 'If you connect the AUX1 bus to common potential independently of the P1/P2 buses (different voltages), there is no safe electrical separation (in accordance with EN 50178) between the AUX1 bus and the P1/P2 buses.'

5. PROFINET IO Wiring

The IM 151-3 PN HF has an integrated 2-port switch with two RJ45 sockets labeled X1 P1 and X1 P2. Either port can be used as 'in' or 'out' — the module auto-negotiates and auto-crosses, so you do not need crossover cables.

RJ45 Pinout (Both Ports)

Network Specifications

Recommended Cabling

Use Siemens FastConnect (FC) PROFINET Cat 5e cabling and the matching FastConnect RJ45 connectors from the FC catalog. Per the ET 200S system manual, validated cable types are:

6. 24 VDC Power Wiring

The IM 151-3 PN HF is powered from a 24 VDC source through a 4-pin connector on the bottom of the module. Two of the pins are 'loop-through' so a second 24 VDC drop can be daisy-chained out to another head module without a separate wire run.

24 VDC Supply Connector

Electrical Specifications

7. Initial Configuration in STEP 7 / TIA Portal

The IM 151-3 PN HF is configured with STEP 7 V5.4 SP4 or higher for IRT 'high performance', or with TIA Portal V13 SP1 or higher for the standard PROFINET IO feature set. The GSDML file is part of the STEP 7 / TIA Portal hardware catalog — no separate import is required for native Siemens controllers. Third-party PROFINET masters can pull the GSDML from the Siemens Industry Online Support portal.

Step-by-Step Commissioning

1. Insert the SIMATIC Micro Memory Card into the IM 151-3 PN HF before powering it. The MMC stores the device name; without it, the device name is lost on every power-cycle.
2. Mount and wire the station: IM on the left, TM-P + PM-E for the first potential group, TM-Es with their EMs, optional additional TM-P/PM-E pairs, terminating module on the right. Wire 24 VDC to the IM and to each PM-E. Plug a PROFINET cable into X1 P1.
3. Open STEP 7 / TIA Portal and create an S7 station with a PROFINET IO controller (e.g. CPU 317-2 PN/DP, S7-1500). Drag the IM 151-3 PN HF from the hardware catalog (ET 200S branch) onto the PROFINET IO subnet.
4. Drag each ET 200S module (PM-E, then EMs) from the catalog into the configuration table in the order they appear on the physical rail. Slot 1 is the first module after the IM. Mismatch between configured and physical order = SF LED at power-up.
5. Set parameters per module: enable diagnostics (e.g. 'Missing load voltage' on PM-E, 'Wire break' on digital outputs), set substitute values, configure PROFIenergy power-off slots if needed.
6. Enter a device name in the IM properties dialog (lowercase, hyphens allowed; must be unique on the PROFINET subnet). Compile the project.
7. Assign the device name online: PLC > Ethernet > Assign Device Name. STEP 7 broadcasts a DCP request, finds the un-named module by MAC, and writes the name to the MMC. The name persists across power cycles thereafter.
8. Download the configuration to the IO controller. The IO controller establishes the PROFINET application relationship (AR) to the IM, the rear-panel bus enumerates the EMs, and ON + LINK + RX/TX LEDs go solid green when data exchange begins.

8. Advanced HF Features

These are the functions that distinguish the HIGH FEATURE variant from a vanilla IM 151-3 PN ST. Each is enabled in the IM properties dialog in STEP 7 / TIA Portal and may also require a compatible IO controller (e.g. PROFIenergy power-down requires firmware that can issue the PE_Start_Pause command).

Isochronous Real-Time (IRT)

Synchronized cyclic data exchange with reserved bandwidth, used by motion control and high-speed coordinated machinery. Two options:

Prioritized Startup

Reduces the time an IO device needs to re-enter cyclic data exchange after (a) supply voltage returns, (b) a station comes back online, or (c) IO devices are activated by program. Useful on lines that need fast tool-change recovery. Note: prioritized startup disables firmware update via Micro Memory Card — only firmware update over the LAN is possible while the feature is active.

Shared Device

A single ET 200S station can present its modules to multiple PROFINET IO controllers simultaneously — e.g. discrete I/O serves a process controller while a fail-safe slice serves a separate F-CPU. Shared Device is not available with IRT 'high flexibility'; it requires the high-performance IRT option or a non-IRT configuration. Power and electronic modules in the same potential group must be assigned to the same IO controller for load-voltage failure diagnosis to work.

Media Redundancy (MRP)

Ring topology with one MRP Manager (commonly an S7-1500 or SCALANCE) and the IM 151-3 PN HF as MRP Client. A single cable break is detected and the ring reconfigured in < 200 ms, transparent to the user program. Recommended for high-availability lines where stopping is unacceptable.

PROFIenergy

Energy-saving function for cyclical pauses (lunch breaks, weekends). The IO controller sends the standardized PE_Start_Pause command (service ID 0x01, index 0x80A0) to the IM, which then disconnects load voltage on the configured PM-E modules and suppresses the resulting diagnostics. PE_End_Pause (service ID 0x02) brings them back. Other services in the data record: 0x03 Query_Modes, 0x04 PEM_Status, 0x05 PE_Identify. Requires a PM-E DC24V/8A RO power module (the relay-output-equipped PM-E) for the actual switching.

9. Diagnostics & LED Display

The IM 151-3 PN HF carries five status LEDs on its faceplate plus two link-state LEDs (one per RJ45 port). The five module LEDs are arranged top-to-bottom on the right edge of the module:

Status Code Decoder (HF Manual A5E01584258-04 Table 4-1)

Common Faults & Resolutions

10. ET 200S to ET 200SP Migration Path

Siemens officially announced the discontinuation of the SIMATIC ET 200S product family for new orders effective 1 October 2020. Spare parts will remain available for at least 10 years from that date (i.e. through 2030). The named functional successor is the SIMATIC ET 200SP, which has been the recommended new-design platform since 2012.

Why Migrate to ET 200SP

Direct Replacement Roadmap

1. Inventory the existing station. Note the IM article number, every TM-P + PM-E pair, and every TM-E + EM pair, then map each ET 200S EM to the closest-spec ET 200SP I/O module from the Siemens migration guide.
2. Re-engineer the BaseUnit layout. ET 200SP groups channels by potential group through 'Light' (BU...D) and 'Dark' (BU...B) BaseUnits rather than separate PM-E modules; redraw the potential-group plan accordingly.
3. Replace the head module. The IM 151-3 PN HF maps to either IM 155-6 PN ST (6ES7155-6AU01-0BN0 / -0CN0) for standard applications or IM 155-6 PN HF (6ES7155-6AU30-0CN0) for shared-device, IRT-high-performance, or large-station builds.
4. Reconfigure in TIA Portal. The GSDML / hardware catalog entries differ between ET 200S and ET 200SP, so the project must be rebuilt; STEP 7 V5 projects also need conversion to TIA Portal first.
5. Re-wire field signals onto the new BaseUnits. The ET 200SP terminal layout does not match ET 200S TMs, so a wiring change is required at the panel level — budget time for marshalling.
6. Validate device-name and topology configuration. Use the new IM 155-6's DCP to assign device names; confirm MRP ring members and IRT sync if those features were used on the ET 200S station.

11. Sibling SKUs in the IM 151 Family

If the IM 151-3 PN HF is not the right fit, here are the other ET 200S head modules in the same generation. PLC Exchange typically stocks the entire family for spare-parts replacement work.

Reference Documentation

The following Rockwell Automation publications were used as references for this guide. These are the official manufacturer documents for the hardware covered in this article.