Siemens 6ES7135-6FB00-0BA1 Retrofit-Ready Analog Output for ET 200SP

Siemens 6ES7135-6FB00-0BA1 Retrofit-Ready Analog Output for ET 200SP Control Systems

The Siemens 6ES7135-6FB00-0BA1 is a 2-channel analog output module designed for the ET 200SP distributed I/O system, operating within the SIMATIC S7-1500 and S7-300/400 control platforms. As legacy automation lines face increasing pressure to modernize, this module has become a critical component in retrofit projects where engineers must replace discontinued analog output cards while preserving existing wiring infrastructure, PLC program logic, and HMI screen configurations.

Whether you are upgrading a control cabinet that originally ran on a SIMATIC S7-300 with SM 332 analog output modules, or migrating a distributed I/O network from PROFIBUS DP to PROFINET IO, the 6ES7135-6FB00-0BA1 provides a compact, backplane-compatible solution that minimizes engineering rework. Its 2-channel output supports 4–20 mA and 0–10 V signal ranges, making it directly interchangeable with many older analog output cards in the field.

Upgrade Compatibility Table

Retrofit Planning for Existing Automation Systems

Successful integration of the 6ES7135-6FB00-0BA1 into an existing control system begins with a thorough audit of the current hardware configuration. Engineers replacing an older SM 332 AO 4×12Bit or a legacy ET 200M analog output card must first verify that the target ET 200SP station is equipped with a compatible BU015 or BU016 BaseUnit. The BaseUnit color code — light or dark — determines whether the module can be hot-swapped without interrupting adjacent I/O channels, which is critical in continuous-process environments.

Terminal wiring adaptation is the next key step. The 6ES7135-6FB00-0BA1 uses the ET 200SP push-in terminal block system, which differs from the screw-type terminals found on older S7-300 signal modules. When migrating from a PROFIBUS DP network to PROFINET IO, the interface module must also be upgraded — typically from an IM 153-2 to an IM 155-6 PN ST or IM 155-6 PN HF. This change requires updating the hardware configuration in TIA Portal and re-downloading the station configuration to the SIMATIC S7-1500 CPU or S7-1200 CPU acting as the IO controller.

Power budget verification is mandatory before commissioning. The ET 200SP backplane distributes 24 VDC across all installed modules via the PM-E power module. Adding or replacing analog output modules changes the total current draw on the backplane bus. Engineers should calculate the aggregate load including any DI/DQ digital I/O modules, AI analog input modules, and communication modules already installed in the same station. If the existing PM-E 24VDC/8A power module is near its rated capacity, a second power segment may be required.

Program compatibility must be validated in TIA Portal before going live. The analog output data block addresses assigned to the 6ES7135-6FB00-0BA1 must match the process image addresses referenced in the existing PLC program. If the original program was written for a different module type — such as an SM 1232 AQ 2×14Bit — the data type widths and scaling factors may differ, requiring adjustments to the normalization and scaling function blocks (NORM_X, SCALE_X) in the structured control program. HMI screens connected via SIMATIC WinCC or a KTP700 Basic Panel that display analog output setpoints must also be reviewed to ensure tag addresses remain valid after the hardware swap.

For systems using PROFIBUS PA field instruments alongside the ET 200SP station, the communication link between the DP/PA coupler and the new PROFINET-based architecture must be carefully mapped. A DP/PA Link IM 157-0 DP or equivalent gateway may be required to bridge legacy PA segments into the modernized PROFINET topology without replacing field instruments prematurely.

Downtime Control During System Migration

Minimizing production downtime during a control system retrofit requires a structured cutover strategy. The recommended approach is to pre-configure and test the new ET 200SP station — including the 6ES7135-6FB00-0BA1 analog output module — on a bench setup before the scheduled maintenance window. Using TIA Portal’s offline simulation and the PLCSIM Advanced environment, engineers can validate the updated hardware configuration, I/O mapping, and program logic without connecting to the live plant network.

During the cutover window, the sequence should follow: isolate the affected control loop outputs, disconnect the legacy analog output module, install the new BaseUnit and 6ES7135-6FB00-0BA1, reconnect field wiring using pre-labeled terminal adapters, download the updated station configuration, and perform a channel-by-channel output verification using a calibrated loop calibrator or milliamp source. The entire swap for a 2-channel module typically takes under 30 minutes when pre-staged correctly.

To protect original program logic, always export and archive the existing TIA Portal project — including all device configurations, network views, and program blocks — before making any hardware changes. If the migration involves replacing a STEP 7 Classic project with a TIA Portal equivalent, use the Migration Tool built into TIA Portal to convert S7-300/400 program blocks, preserving function block interfaces and data block structures wherever possible. This approach ensures that the control logic governing critical process outputs — such as valve positioners, variable-speed drives, or temperature controllers — remains intact and verifiable after the hardware change.

All units supplied by SMARTNEXMSK are tested for output accuracy, channel isolation, and communication handshake prior to shipment. A 12-month warranty covers manufacturing defects and functional failures under normal operating conditions, giving maintenance teams confidence during the post-retrofit stabilization period.

Retrofit Support FAQ

Q1: Is the 6ES7135-6FB00-0BA1 a direct replacement for the SM 332 AO 4×12Bit used in S7-300 systems?
Not a plug-and-play swap — the 6ES7135-6FB00-0BA1 is designed for the ET 200SP platform and requires a compatible BaseUnit and an ET 200SP station with a PROFINET interface module. However, it is the recommended migration path when upgrading from S7-300 distributed I/O to the ET 200SP architecture. Wiring can be adapted using terminal block converters, and the TIA Portal migration tool assists with program block conversion.

Q2: What wiring changes are required when replacing an older analog output module?
The 6ES7135-6FB00-0BA1 uses ET 200SP push-in terminals rather than screw terminals. Field cables can be reconnected directly, but terminal ferrules are recommended for reliable contact. Verify output polarity, shielding continuity, and grounding at the BaseUnit before powering up. For 4–20 mA loops, confirm that the field device is configured for passive (sourcing) or active (sinking) mode to match the module’s output type.

Q3: How is the module addressed and commissioned in TIA Portal?
The module address is automatically assigned by TIA Portal based on its slot position within the ET 200SP station. After adding the module to the hardware catalog and downloading the configuration to the IO controller (S7-1500 or S7-1200), the module appears in the process image with its assigned I/O address range. Channel parameterization — including output range, substitute value behavior, and diagnostics — is configured in the module properties dialog within TIA Portal V14 or higher.

Q4: Does SMARTNEXMSK test modules before shipment, and what does the 12-month warranty cover?
Yes. Every 6ES7135-6FB00-0BA1 unit is functionally tested for output accuracy across both channels, communication handshake with an ET 200SP station, and channel isolation before dispatch. The 12-month warranty covers manufacturing defects and functional failures under normal industrial operating conditions. Units showing damage from incorrect wiring, overvoltage, or physical mishandling are assessed case by case. Contact sales@smartnexmsk.com for warranty claims or pre-shipment test reports.

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