Simatic ET200S Terminal Module Siemens 6ES7193-4JA00-0AA0 OEM

Siemens 6ES7193-4JA00-0AA0 | SIMATIC DP ET 200S Termination Module — Spare Part, 30×106×7.5mm, 0.05kg, Completes Electronics Module Row

Overview

The Siemens 6ES7193-4JA00-0AA0 is the termination module for the SIMATIC ET 200S distributed I/O system — the small but necessary component that closes out every ET 200S station at its rightmost end.

At first glance, it looks like a trivial piece of hardware: a thin plastic and metal module, 30mm wide, 106mm tall, and only 7.5mm deep, weighing 50 grams.

But without it, an ET 200S station either cannot operate or — in some configurations — creates an open-ended backplane bus that can cause communication errors, spurious diagnostic alarms, or damage to the backplane electronics.

The ET 200S system's physical architecture places an interface module (IM 151) at the left end of each station, followed by power modules and electronics modules assembled on their terminal modules across the station rail.

The internal backplane bus — the electrical connection that links all modules in the station — must be closed at the right end.

The termination module performs this closure: it provides the end-stop for the mechanical assembly and completes the electrical termination of the internal bus connections.

An ET 200S station missing its termination module is like a backplane with an open connector — the dangling bus connections become a source of noise pickup and can prevent the interface module from correctly initialising the station.

Siemens's ET 200S documentation specifies the termination module as a required component in every station configuration, not an optional accessory.

Because of its small size and light weight, the termination module is one of the components most likely to be lost or misplaced during station assembly, modification, or maintenance — which is why Siemens stocks it as a spare part with this dedicated order number.

Key Specifications

ET 200S Architecture — Why Termination Matters

The SIMATIC ET 200S is Siemens's granular distributed I/O platform — designed to place exactly the right number of I/O points at each machine location rather than forcing oversized I/O modules.

Each ET 200S station is built module by module: the interface module first, then power modules, then combinations of 2-channel digital input modules, 2-channel digital output modules, 2-channel analog modules, and other specialty electronics — each paired with a terminal module that carries the field wiring. 

The station can be as small as one electronics module or as large as the interface module's maximum supported configuration.

Inside this assembly, the internal bus connects all modules from left to right along the DIN rail.

The interface module drives the bus at the left end, routing PROFIBUS DP communication data, 24V DC logic power, and module identification signals across all installed electronics modules.

The bus must be terminated at the right end to prevent reflections and to signal to the interface module that the scan has reached the end of the station.

Without the termination module, two problems arise. Mechanically, the last terminal module in the row lacks its right-side locking mechanism — some terminal module designs rely on the termination module's mechanical engagement to secure the last module firmly to the rail.

Electrically, the open bus end can generate communication errors in the interface module's diagnostics cycle. Both issues are resolved by correctly installing the termination module as the final element on the right side of every ET 200S station.

Dimensions and Physical Form — 30×106×7.5mm

The termination module's slim 7.5mm depth and 30mm width are matched to the ET 200S terminal module profile — it integrates flush with the assembled station without protruding beyond the electronics modules.

The 106mm height aligns with the standard ET 200S module height, maintaining the station's uniform appearance on the DIN rail.

These dimensions explain the module's 50g weight.

Despite being lightweight, the termination module's housing is made from the same engineering plastic as other ET 200S components — resistant to the ambient conditions (humidity, vibration, airborne contamination) typical of control cabinet environments.

The module requires no external power supply, no configuration, and no STEP 7 hardware setup. Its function is entirely passive: it closes the connections it receives from the last active module in the row.

Stocking the Termination Module — Practical Maintenance Considerations

Because one termination module is required per ET 200S station, a facility with multiple ET 200S stations across its production equipment needs a corresponding number — one per station installed, plus a maintenance stock.

The 0.05kg weight and compact dimensions mean multiple termination modules can be stocked in a small space with minimal cost.

The most common scenarios where the termination module becomes a critical spare are:

Station expansion: Adding electronics modules to an existing ET 200S station requires removing the termination module, inserting the new modules, and reinstalling the termination module at the new rightmost position. If the termination module is misplaced or damaged during this process, the station cannot be put back into service.

Station relocation: Moving an ET 200S station during machine reconfiguration sometimes results in the termination module being lost among other components during disassembly. Having a spare on hand avoids the delay of waiting for a replacement to be ordered and delivered.

New station commissioning: When commissioning a new ET 200S station from individual component purchases — particularly in markets where components are sourced from multiple suppliers — the termination module may not be included with the module kit if ordered separately. Ensuring it is on the bill of materials prevents assembly-day delays.

FAQ

Q1: Is one termination module required per ET 200S station, or per rack?

One termination module is required per ET 200S station — specifically, one at the rightmost end of each station's module assembly.

Unlike some modular PLC systems where a termination component is needed per rail segment, the ET 200S architecture uses a single termination module per complete station regardless of how many electronics and terminal modules are installed in that station. 

If a facility has four separate ET 200S stations at different machine locations, four termination modules are required.

Q2: The module is listed as a spare part. Does this mean it was originally included with other ET 200S components?

Yes. In the original ET 200S system delivery, termination modules are typically included with the interface module package or as part of a station kit.

The 6ES7193-4JA00-0AA0 is listed as a spare part because its primary purpose in the market is as a replacement for lost, damaged, or missing termination modules in existing installations. 

For new ET 200S stations being built from scratch, the termination module should be explicitly included in the component purchase list, as it may or may not be included with individual module orders from distributors.

Q3: Can the 6ES7193-4JA00-0AA0 termination module be used with both PROFIBUS DP and PROFINET ET 200S variants?

The termination module's function is mechanical and passive electrical bus termination — it does not carry any protocol-specific electronics.

The 6ES7193-4JA00-0AA0 is physically compatible with ET 200S stations based on both PROFIBUS DP (IM 151-1, IM 151-3 for PROFINET) interface modules, as the internal backplane bus connector geometry is the same across ET 200S station types. 

The termination module simply closes whatever bus connections it receives from the last electronics/terminal module in the row, regardless of the station's network protocol.

Q4: Does the ET 200S station generate a diagnostic alarm if the termination module is missing?

The interface module can detect the absence of the termination module in some configurations — particularly when the station's configuration stored in the PROFIBUS master (STEP 7 HW Config) expects a specific station structure.

If the station fails to report correctly during the bus scan, the DP master generates a slave diagnostic error.

In practice, some ET 200S configurations may operate without generating an immediate critical alarm, but the missing termination module creates a risk of intermittent communication errors, particularly in electrically noisy environments. 

Installing the termination module is always the correct action, even if no immediate alarm is visible.

Q5: What is the maximum number of electronics modules that can be installed in one ET 200S station before the termination module?

The maximum number of electronics modules per ET 200S station depends on the interface module variant. With the standard IM 151-1 DP interface module, up to 63 electronics modules can be installed in one station (though the practical maximum is often limited by power supply current capacity and the specific module mix). With IM 151-3 PN (PROFINET), the maximum is also variant-dependent.

Regardless of the number of modules, exactly one termination module is required — always at the rightmost position of the station, after the last electronics module.