SIEMENS 6ES7350-2AH01-0AE0

What is the 6ES7350-2AH01-0AE0 and where is it used?

The 6ES7350-2AH01-0AE0 is a SIMATIC S7-300 FM 350-2 function module from Siemens for high-speed counting and measurement applications in automation systems. It is used whenever pulses from encoders and sensors must be acquired accurately and standard I/O modules are no longer sufficient. Typical applications include packaging systems, sorting systems, dosing systems, as well as speed and frequency monitoring. For maintenance personnel, the module is important when piece counts must be reliably counted, limit values monitored, or fast reactions triggered directly within the module. For purchasing and production departments, the exact article number is relevant because it describes a highly specialised 8-channel solution used in existing S7-300 and ET 200M environments that often requires targeted replacement, exchange, or repair.

Overview of the key technical data and what it means

Technically, the FM 350-2 provides 8 counting channels with frequencies of up to 20 kHz, a 24 V DC supply, 8 digital inputs, 8 digital outputs, and 32-bit counters with a range of up to ±2,147,483,647. In practice, this means that several sensors can be evaluated simultaneously, even when pulse sequences occur at high speed. The module supports 24 V incremental encoders, 24 V proximity switches, 24 V direction signals, NAMUR sensors, and 2-wire sensors. The outputs can trigger process reactions directly, with up to 0.5 A per output. For retrofit projects and spare-part verification, the required 40-pin front connector, dimensions of 80 x 125 x 120 mm, a weight of approximately 460 g, and the combination of counting, frequency, speed, period-duration, and dosing functions within a single module are particularly important.

Product status, life-cycle status, and obsolescence

The product status is clearly in the late stage of its life cycle. Siemens lists the 6ES7350-2AH01-0AE0 as a spare part, and the life-cycle status in the Siemens portal is Product Cancellation. In addition, the SIMATIC S7-300 / ET 200M platform has entered the product phase-out stage. For operators, this means that long-term supply through standard new-product channels is becoming more challenging, and that repair services, exchange units, and verified spare-part inventories are becoming increasingly important. A direct successor explicitly designated by Siemens for this exact article number could not be verified. However, Siemens does confirm that the 6ES7350-2AH01-0AE0 is fully compatible with and replaces the earlier 6ES7350-2AH00-0AE0. For migration projects to the S7-1500 platform, Siemens primarily recommends the TM Count 2x24V and, depending on the application, the TM TimerDIDQ 16x24V modules.

Available EICHLER services and when they are relevant

For operators of existing systems, the services offered by EICHLER are particularly relevant because they help address the typical challenges of downtime, obsolescence, and procurement pressure. According to the referenced shop information, repair, exchange, used, and new units are currently available. EICHLER specifies a turnaround time of 2–5 days for repairs, including a minimum 24-month warranty, while exchange, used, and new units are listed with availability of 1–3 days. This is especially practical when an FM 350-2 must be returned to operation quickly or when a complete failure must be avoided during the ongoing S7-300 phase-out period. For maintenance teams, the priority is a rapid return to production; for purchasing departments, predictable procurement; and for decision-makers, the ability to maintain a reliable supply chain even as obsolescence continues to advance.

What is the difference between the 6ES7350-2AH00-0AE0 and the 6ES7350-2AH01-0AE0?

Siemens introduced the 6ES7350-2AH01-0AE0 as a fully compatible replacement for the older 6ES7350-2AH00-0AE0. This is important for purchasing and maintenance because older systems often still reference the predecessor part number, while the actually available or repaired replacement module is now frequently the 2AH01 version. When checking legacy spare-parts lists, both part numbers should therefore always be compared.

Is the 6ES7350-2AH01-0AE0 still available as a new part or only as a spare part?

Siemens officially classifies the module as a spare part and lists it with a Product Cancellation life-cycle status. As a result, it should no longer be regarded as an actively marketed growth product. Nevertheless, it may still be available on the market as a new, used, exchange, or repair solution. On the referenced EICHLER page, all of these procurement options are currently available, which is particularly relevant for operators of existing systems.

Can I commission the FM 350-2 in TIA Portal?

Yes. Siemens provides a dedicated support article including a STEP 7 / TIA Portal project for commissioning the FM 350-2 (6ES7350-2AH01-0AE0). The module also continues to appear in more recent STEP 7 and TIA Portal readme files. For operators, this means that although the module is based on an older technology platform, commissioning and configuration within the TIA environment are documented and generally supported.

Which encoders and sensors can be connected to the 6ES7350-2AH01-0AE0?

The module supports single-ended incremental encoders, 24 V proximity switches, 24 V direction signals, NAMUR sensors according to DIN 19234, and 2-wire sensors. In practice, this means that the FM 350-2 is flexible enough for typical pulse-generating devices used in packaging, conveying, sorting, and dosing applications. The key requirement is that the encoder type, signal level, and parameterisation match correctly so that counting direction, frequency measurement, and period measurement operate reliably.

How can I read all 8 channels as quickly as possible?

Siemens recommends alternating the read requests for the channel groups when fast cyclic acquisition of all 8 channels is required. In practice, this is typically implemented by alternating between Job 100 and Job 101. Depending on the project configuration, some values can also be read via the process image area. If extended user data is used, the corresponding requirements must be fulfilled; however, update rates are significantly slower and are typically in the range of 100 to 200 ms.

Which alternative is recommended when migrating to S7-1500?

For migration of FM 350-2 functionality to the S7-1500 platform, Siemens does not provide a direct 1:1 replacement module with the same architecture. Instead, Siemens recommends solution-based approaches, primarily using the TM Count 2x24V and, depending on the application, the TM TimerDIDQ 16x24V. Siemens also generally recommends migrating to modern I/O platforms such as ET 200MP or ET 200SP as part of larger modernisation projects. For decision-makers, this is important because it not only replaces the required functionality but also provides a more sustainable long-term strategy against obsolescence.