Terminal Module 6ES7193-4CD20-0AA0 6ES7 193-4CD20-0AA0 6ES7193-4CD2O-OAAO

Siemens 6ES7193-4CD20-0AA0 | SIMATIC ET 200S Terminal Module TM-P15S23-A0 — Power Module Base, 15mm, Screw Contacts, 2×3 Terminals, AUX1 Interrupted, 132×15×43mm, 65g

Overview

The Siemens 6ES7193-4CD20-0AA0 is the TM-P15S23-A0 terminal module — the individual base carrier that every power module in a SIMATIC ET 200S station mounts onto. To understand this part fully, you need to understand how the ET 200S is physically built.

Unlike the S7-300, where all modules plug directly into a shared mounting rail and connect through a common backplane, the ET 200S uses a two-part architecture: every module — power module, I/O module, motor starter — consists of the electronic module itself and a dedicated terminal module that stays fixed on the DIN rail when the electronic module is removed.

The terminal module does two jobs simultaneously. It is the mechanical carrier that clips to the 35mm DIN rail and provides the locking socket for the electronic module. And it is the wiring carrier — all field wiring terminates on the terminal module's screw contacts, not on the electronic module. When an electronic module needs replacement, the field wiring remains undisturbed on the terminal module.

The replacement module snaps in and immediately inherits every field connection. In a production environment where machine downtime means lost output, module replacement without rewiring takes seconds instead of the minutes required when wiring must be disconnected and re-terminated.

The TM-P15S23-A0 (this part) is specifically designed for power modules.

The "P" designation distinguishes it from the TM-E terminal modules used for electronic I/O modules. The mechanical slot geometry of TM-P modules matches only power modules — inserting the wrong electronic module type is mechanically blocked.

This error-prevention feature matters during both initial installation and routine maintenance when multiple module types may be on the bench simultaneously.

Key Specifications

The AUX1 Bus — What "Interrupted" Means in the Station Design

The full designation TM-P15S23-A0 encodes three important characteristics: S for screw terminals, 23 for the terminal count variant, and A0 for the AUX1 bus behaviour. AUX1 is an auxiliary bus that runs the length of an ET 200S station alongside the main backplane bus, used to distribute an additional 24V DC supply from a power module to the electronic modules in a defined section of the station.

The A0 designation means AUX1 is interrupted at this terminal module — the AUX1 bus does not pass through this position. This interruption capability is what allows an ET 200S station to be divided into independently powered zones.

Everything to the left of this TM-P15S23-A0 position draws its AUX1 supply from a power module upstream; everything to the right starts a new AUX1 supply from the power module mounted on this terminal module. Station designers use this to create sections that can be de-energised separately — for example, powering down one group of I/O modules for safe access while adjacent I/O modules remain operational — without powering down the entire station.

The alternative is the TM-P15S23-A1 (looped AUX1), where the AUX1 bus passes through the terminal module position without interruption, continuing the same supply across the entire power zone.

Whether to interrupt or loop the AUX1 at each power module position is an engineering decision specific to the station design and the machine's operational requirements.

How Terminal Modules Are Assembled Into an ET 200S Station

Building an ET 200S station from scratch follows a defined assembly sequence. The IM (interface module) and its terminal module anchor the left end of the station.

Power modules and their TM-P terminal modules are placed at positions where new power zones begin. Electronic I/O modules and their TM-E terminal modules fill the remaining positions.

Terminal modules connect mechanically side-by-side along the DIN rail through lateral clips that align their backplane bus contacts.

Once all terminal modules are correctly positioned and clipped, the backplane bus runs continuously from the interface module to the end module. 

Electronic modules then snap into their respective terminal modules from the front — a single motion that makes both the backplane bus connection and the field wiring connection simultaneously.

The ET 200S system allows up to 64 electronic modules per station, and within that limit, the terminal module layout is flexible.

Terminal modules of different widths (15mm narrow, 30mm wide for motor starters) and different types (TM-P, TM-E) can be mixed in the same station, with the physical order reflecting the logical power zone organisation and the sequence of the PLC's I/O addressing.

Maintenance Advantage — Module Swap Without Rewiring

The practical maintenance value of the terminal module system is most apparent in the field. Consider a 24-channel digital input ET 200S station with eight TM-E terminal modules, each carrying a 3-channel digital input module. If one electronic module fails, the affected terminal module remains on the rail with all its field wiring intact.

The maintenance engineer removes the failed electronic module by pressing its release latch and pulling it forward, inserts the replacement module — which snaps into position and connects all 24 field wires in one motion — and the station is back in service.

No wiring check, no re-termination, no label reading under time pressure.

The same principle applies to the TM-P power module terminal: if the power module mounted on a TM-P15S23-A0 fails, the terminal module and all its wiring remain in place, and only the power module electronics need to be replaced.

This separation of mechanical/wiring infrastructure from replaceable electronics is what makes the ET 200S system well-suited to installations where maintenance efficiency is a priority.

FAQ

Q1: Can the TM-P15S23-A0 accept ET 200S electronic I/O modules (digital or analog input/output), or only power modules?

Only power modules. The TM-P terminal module family is physically and electrically designed exclusively for ET 200S power modules (PM-D and PM-E types).

The connector geometry on a TM-P module is specific to power module profiles — an I/O electronic module cannot seat into a TM-P terminal module, and a power module cannot seat into a TM-E terminal module.

This mechanical type-coding prevents cross-installation errors during both first installation and maintenance activities.

Q2: What is the difference between the TM-P15S23-A0 (screw) and the TM-P15C23-A0 (spring) terminal modules?

Both are 15mm wide, both have 2×3 terminal connections, and both interrupt the AUX1 bus (A0 designation). The single difference is the terminal type: S = screw (this part, 6ES7193-4CD20-0AA0), C = cage clamp spring (the -4CC20-0AA0 variant).

Screw terminals require a screwdriver for termination and offer the familiar, well-established connection method. Spring-clamp terminals use a push-in mechanism for tool-less connection — faster to wire and typically more resistant to vibration-induced loosening over time.

The choice between them is a field wiring preference; both provide equally reliable electrical connections.

Q3: How is the TM-P15S23-A0 secured to the DIN rail, and can it be removed without dismantling the entire station?

The terminal module clips to the standard 35mm DIN rail using a built-in spring latch mechanism. A screwdriver inserted in the release slot deflects the latch, allowing the module to be lifted off the rail.

However, removing one TM-P terminal module from a fully assembled station requires first disconnecting the mechanical clips between it and its neighbours, which in practice means partially disassembling the adjacent modules as well. 

Terminal module replacement is therefore a more involved procedure than electronic module replacement.

For this reason, terminal module positions are typically planned carefully during station design, and terminal modules are rarely moved once the station is wired and commissioned.

Q4: Does the 6ES7193-4CD20-0AA0 require any configuration in STEP 7 or TIA Portal?

Terminal modules are purely hardware components — they have no electronic intelligence and are not represented as separate entities in the PLC software configuration.

In STEP 7 or TIA Portal's hardware configuration, the ET 200S station is configured by specifying the electronic modules (power modules, I/O modules) and their slot positions. 

The terminal module type is implied by the module selection and slot assignment, but the terminal module itself does not appear as a separate configurable item.

What matters in the software configuration is the electronic module type at each position; the terminal module simply ensures that the electronic module and field wiring connections are physically present at that position.

Q5: The product is listed as a spare part. Does Siemens still manufacture it for new installations?

ET 200S terminal modules remain available from Siemens as spare parts for maintenance of existing ET 200S installations.

Siemens's current-generation distributed I/O platform is the SIMATIC ET 200SP, which uses a different terminal module system (BU — Base Units) that is not physically compatible with ET 200S terminal modules. 

For new installations, Siemens recommends ET 200SP. For existing ET 200S stations, the 6ES7193-4CD20-0AA0 and the full range of ET 200S terminal modules continue to be available as spare parts, and Siemens maintains this availability to support the installed base of ET 200S systems in operation worldwide.