Configuring Siemens ET 200SP with S7-1212C in TIA Portal Basic

Overview

The SIMATIC ET 200SP is the current-generation distributed I/O system from Siemens and pairs naturally with the SIMATIC S7-1200 CPU family via PROFINET. Engineers commissioning an S7-1212C station often try to add ET 200SP from the "Add new device" dialog of TIA Portal and find that the head station is missing. That behavior is not a bug; it is by design: distributed I/O stations are inserted as PROFINET IO devices in the Network view, where they attach to the PROFINET interface of the CPU.

This guide walks through the complete procedure for an S7-1212C + ET 200SP station in TIA Portal Basic (V16/V17/V18). It also clarifies a frequently observed catalog confusion: the IM 151-3 PN interface module 6ES7151-3AA23-0AB0 belongs to the legacy SIMATIC ET 200S family, not to ET 200SP. ET 200SP uses Interface Module IM 155-6 PN family with article numbers under MLFB 6ES7155-6....

Prerequisites

• Engineering tool: TIA Portal Basic V16 or later, installed with SIMATIC S7-1200 support package. Earlier versions (V13/V14) will still catalog ET 200SP hardware, but bug-fix and firmware revisions require V16+.
• CPU: SIMATIC S7-1212C DC/DC/DC or AC/DC/RLY with PROFINET port on the CPU body. Firmware V4.4 or later recommended to interoperate with ET 200SP IM 155-6 PN ST firmware V3.x.
• Head module: SIMATIC ET 200SP Interface Module IM 155-6 PN ST (standard) or IM 155-6 PN HF (high-feature, firmware V3.1 onward).
• Bus Adapter (BA): Two-port RJ45 (BA 2xRJ45), two-port FC (BA 2xFC), or single-port variant matched to the field wiring.
• I/O modules: At least one ET 200SP BaseUnit (BU) with a digital or analog module plugged in.
• Ethernet cabling: PROFINET cable, at least one switch (or direct CPU-to-IM cable for the simplest topology).
• TIA Portal license: Basic is sufficient for S7-1200 + ET 200SP configuration. Higher-tier "Professional" features such as PROFINET topology editor (graphical) are optional; Basic exposes the topology editor as a tabular view.

Hardware Selection: ET 200S vs ET 200SP Catalog

A common commissioning error is to mis-cite the interface module. The article numbers in the original support question (6ES7151-3AA23-0AB0 IM 151-3 PN for ET 200S, and 6ES7131-4BF00-0AA0 digital input for ET 200S) are correct ET 200S parts, not ET 200SP. ET 200SP and ET 200S share the same I/O philosophy but use different housings, backplane connectors, and module firmware families.

Correct ET 200SP Article Numbers

For a typical S7-1212C application, order from the following part numbers:

These parts are documented in the ET 200SP system manual set referenced at SIMATIC ET 200SP manual collection on docs.tia.siemens.cloud.

Why ET 200SP Does Not Show in "Add New Device"

The "Add new device" dialog in TIA Portal is restricted to controllers and PC stations (i.e., devices that host the project itself). Distributed I/O stations cannot host a project; they are subordinate to a CPU. TIA Portal therefore exposes distributed I/O only through the following paths:

1. Network view → Catalog → PROFINET IO → ET 200SP: Right-click on the PROFINET subnet and select "Add device" to drop an ET 200SP head module onto the wire. This is the supported entry point for TIA Portal Basic.
2. Hardware catalog → Search field: Type "6ES7155" (IM 155-6 family) or "ET 200SP" to find the head module. Drag it onto the network or onto the IO controller port.
3. Importing a GSD file: For ET 200SP variant firmware not yet installed locally, an alternative head module can be installed from GSD on a vendor's support portal. TIA Portal Basic supports GSDML V2.3x and higher. See the TIA Portal help under "Options → Manage device description files (GSD)".

Step-by-Step: Adding ET 200SP to a S7-1212C Project

Step 1 — Create the S7-1212C station

1. Open TIA Portal. Create a new project. Select Project → New... → name the project, accept the default storage path.
2. From the Portal view (or Project view, your preference), click Devices & networks → Add new device. Choose SIMATIC S7-1200 → CPU → CPU 1212C DC/DC/DC (or the AC/DC/RLY variant). MLFB candidates include 6ES7212-1AE40-0XB0 (firmware V4.4) and 6ES7212-1BE40-0XB0 (relay output). TIA Basic typically offers the latest firmware revision of each article.
3. Click Add. The CPU appears in the project tree under Devices & networks.

Step 2 — Open Network view

1. Double-click Devices & networks. The Device view opens showing the CPU's slots. Switch to the Network view tab at the top of the editor (alternatively use the icon on the right edge).
2. The CPU's two PROFINET ports are visible as green circles. The single PROFINET subnet drawn between them represents the IO controller's network.
3. Click an empty area of the subnet (or right-click the subnet → "Add device") to drop an ET 200SP station.

Step 3 — Drag ET 200SP head module from the catalog

1. The hardware catalog is on the right. Use the search field at the top: type 6ES7155 or "ET 200SP".
2. Locate PROFINET IO → ET 200SP → Interface modules → IM 155-6 PN ST. Multiple firmware revisions appear; the most recent one is always at the top. Right-click the head module → Insert or drag-and-drop onto the PROFINET subnet.
3. The catalog now allows you to assign a module ID, e.g., Station number = 1. The device name appears below the head module as "et200sp_1" by default.

Step 4 — Plug BaseUnits and I/O modules

1. Switch back to the Device view (click on the head module → Device view). Empty slots appear for slot 0 (bus adapter) and slots 1–32.
2. Drag the appropriate BaseUnit from the catalog → ET 200SP → BaseUnits. BU15-P16+A0+12B / +23B are typical 12 mm-wide units. Slot 0 of the head module is the bus-adapter slot; it accepts any BA (no base unit required).
3. Insert I/O modules on the BaseUnits in the catalog order you want. The station's actual chassis must match the catalog order; otherwise CPU will report "Slot empty / Module mismatch".
4. Note the auto-assigned I/O addresses (e.g., I0.0..I0.7 for DI 8x24VDC HF). You can override the addresses via the module's Properties → I/O addresses tab.

Step 5 — Configure the PROFINET interface

1. Click the head module's green PROFINET port to bring up the port properties. Configure:
   • IP address: e.g., 192.168.0.10 (must be on the same subnet as the CPU; default 192.168.0.1/24 is suitable for point-to-point).
   • Subnet mask: 255.255.255.0.
   • PROFINET device name: e.g., et200sp-io1. This name must match the device name assigned to the physical module via "Assign PROFINET device name" during commissioning.
   • Update time / Watchdog: Use the default. The CPU computes an optimum based on the number of devices; explicit override rarely required.
2. Switch to Properties → PROFINET interface → Port 1 / Port 2 → port mode: PN IO (default).

Step 6 — Assign PROFINET name to physical device

1. From the project tree right-click Devices & networks → ET 200SP station → Assign PROFINET device name.
2. Select the reachable head module (MAC list shows the IM's printed MAC). Click Assign name. Confirm with the MAC of the device sticker.
3. If the head module supports LLDP topology discovery, TIA Portal Basic can detect it automatically (see "Topology view").

Step 7 — Compile, download, and verify

1. Select the CPU in the project tree → Compile → Hardware (rebuild all).
2. Connect the S7-1212C to the PC via PROFINET (or via the diagnostic port if accessible).
3. Click Download to device → Extended download... → select PG/PC interface type → Show all online nodes → choose the S7-1212C → Download.
4. Restart the CPU if it requests "Download with consistent CPU in RUN-P". For ET 200SP configuration changes, "Download in STOP" is required the first time; subsequent changes can download with port-update or slot-update scenarios.
5. Open Online & diagnostics on the ET 200SP station. Confirm green status: PROFINET IO → RUN; module status: No fault; I/O LEDs: Green ON.

I/O Address Mapping Reference

Below is the default address allocation for a typical single-station S7-1212C + ET 200SP. Override in Properties → I/O addresses as needed.

Configuration Verification & Online Diagnostics

Once the station is in operation, follow this verification procedure to confirm a healthy PROFINET link and slot image.

1. Right-click the ET 200SP head module → Online & diagnostics. The status should read OK — No faults.
2. Open PROFINET diagnostics → Module information. All slots should list their module type and revision.
3. Force an input test: select one DI channel → right-click → Monitor/modify → enable the field input. Confirm the tag changes state in the watch table.
4. For analog modules, open Monitor on the analog input and verify value accuracy against a known reference (e.g., 10.000 V on a precision source yields 27648).
5. Open the CPU diagnostic buffer (Online & diagnostics → Diagnostic buffer) and confirm there are no PROFINET IO faults or slot faults.

Troubleshooting Matrix

Firmware Compatibility Notes

Safety & Isolation Considerations

Use only ET 200SP BaseUnits approved for the voltage class of the connected field wiring. Type A0 (light gray) BaseUnits do not include a separate AUX supply; Type B (dark gray) / Type C (red) BaseUnits do. Mixing types can lead to module swap errors. Always respect the touch-protection requirement: each BaseUnit's wiring cover must be re-installed after termination.

Reference Resources

Engineers commissioning an S7-1212C station with ET 200SP should always validate against the latest Siemens manuals at Siemens Industry Online Support and the current SIMATIC ET 200SP manual collection. The S7-1200 product family page is at siemens.com/simatic-s7-1200.