SIMATIC ET 200SP Distributed I/O Deployment Guide for SIMATIC PCS 7 Process Control Systems

SIMATIC ET 200SP is fully certified and released as distributed process remote I/O for SIMATIC PCS 7 starting with PCS 7 V8.1 and V8.2. Operating exclusively over PROFINET Industrial Ethernet (PROFIBUS DP is unsupported for ET 200SP in PCS 7), the ET 200SP architecture utilizes High Feature (HF) interface modules (IM 155-6 PN HF) to provide high-density push-in terminal connectivity, hot swapping in RUN, and integrated channel diagnostics. Starting with PCS 7 V8.2 and CPU 410-5H firmware V8.2, ET 200SP supports PROFINET System Redundancy (S2), allowing a single ET 200SP station to communicate concurrently with both sub-racks of a redundant S7-400H controller.

ET 200SP Process Automation Architecture and System Release Status

In modern process control engineering, distributed I/O stations are migrating from bulky legacy racks to compact, high-performance remote I/O systems:
* Release Status in PCS 7:
* Formally released in PCS 7 V8.1 (via dedicated Hardware Support Packages) and natively supported in PCS 7 V8.2 / V9.0.
* Documented in the official Siemens manual: SIMATIC Process Control System PCS 7 Released Modules (Chapter 8).
* Core Technological Advantages:
* Ultra-Compact Footprint: 50% narrower than legacy ET 200M, saving critical cabinet space.
* Push-In Terminals: Tool-free wiring with integrated test points.
* Hot Swapping (Multi-Hot-Swap): Modules can be replaced while the station remains live in RUN.
* PROFINET Exclusivity: Operates exclusively over PROFINET Industrial Ethernet; not supported on PROFIBUS DP in PCS 7.

Interface Module Requirements: High Feature (HF) vs Standard

Selecting the correct interface module (IM) is vital for process automation compliance:

The Mandatory Module: IM 155-6 PN High Feature (6ES7155-6AU00-0CN0 / 6ES7155-6AU01-0CN0):
Required for PCS 7. Supports advanced diagnostic interrupts, isochronous real-time, multi-hot-swap, and S2 system redundancy.
Accommodates up to 64 I/O modules per station.
The Incompatible Module: IM 155-6 PN Standard / Basic (6ES7155-6AA01-0BN0):
Designed for standard factory automation (TIA Portal / S7-1200/1500).
Lacks the diagnostic descriptors and driver generator support required by PCS 7.
Prohibited in PCS 7 deployments.

PROFINET System Redundancy (S2) with Fault-Tolerant S7-400H

In fault-tolerant S7-400H and CPU 410-5H architectures:

What Is PROFINET S2 System Redundancy?:
An ET 200SP High Feature station establishes two simultaneous application relationships (ARs) over PROFINET: one to Master CPU (Rack 0) and one to Standby CPU (Rack 1).
If Rack 0 fails, communication fails over to Rack 1 within 30 to 50 milliseconds without process interruption or I/O blips.
Network Topology:
Interconnected via Media Redundancy Protocol (MRP) rings using managed SCALANCE X switches or direct daisy-chain PROFINET loops.
Supported with CPU 410-5H and S7-400H controllers running PCS 7 V8.2 and V9.0.

CFC Module Driver Generation and Hardware Configuration

Deploying ET 200SP in PCS 7 follows a streamlined engineering workflow:

HW Config Setup:
* Drag IM 155-6 PN HF onto the CPU's PROFINET IO system.
* Populate BaseUnits (light BaseUnits for new potential groups, dark BaseUnits for pass-through power).
* Insert analog and digital I/O modules (AI 8xI 2-/4-wire BA/HF, DI 16x24VDC BA/HF).
CFC Signal Interconnection:
* Interconnect module peripheral addresses directly to APL channel driver blocks (Pcs7AnIn, Pcs7DiIn).
Automated Driver Generation:
* Compile CFC with Generate Module Drivers checked.
* The compiler automatically generates the diagnostic block tree: OB_BEGIN, MOD_D1, and channel health blocks, linking them to WinCC Maintenance Station alarms.

Comparison of SIMATIC Distributed I/O Systems (ET 200M vs ET 200SP)

The table below compares the primary distributed I/O systems deployed in SIMATIC PCS 7.

System CharacteristicSIMATIC ET 200M (IM 153-2)SIMATIC ET 200SP (IM 155-6 PN HF)Fieldbus ProtocolsPROFIBUS DP & PROFINETPROFINET Only (in PCS 7)Form Factor / DensityStandard 19" rack style / S7-300Ultra-compact modular BaseUnitsWiring TechnologyScrew terminal front connectorsSpring-loaded Push-In terminalsSystem RedundancyDual IM modules (R1 Redundancy)Single IM with S2 System RedundancyHot SwappingSupported with active bus modulesSupported standard (Multi-Hot-Swap)Channel DiagnosticsSupportedAdvanced per-channel LED & diagnostic interruptsLifecycle StatusMature / Declared for Phase-OutActive Current Standard

Verification

To confirm that an ET 200SP station is properly integrated:
1. In HW Config, verify that IM 155-6 PN HF compiles cleanly with zero address overlap errors.
2. In CFC, compile with Generate Module Drivers: confirm module driver blocks generate with 0 Errors.
3. Download to controller: verify that the ET 200SP RN (Run) and MT (Maintenance) LEDs report steady green.
4. Unplug an active I/O module (Hot-Swap Test): confirm that the controller continues running without tripping, OB83 (Remove/Insert Interrupt) executes, and WinCC logs an I/O module missing alarm.
5. Plug the module back in: confirm automatic re-parameterization within 2 seconds.

Limitations and Operational Precautions

ET 200SP cannot be connected to PROFIBUS DP in PCS 7; all ET 200SP deployments must run on PROFINET Industrial Ethernet.
Always ensure BaseUnits are partitioned correctly: a light BaseUnit (white terminal block) must be installed at Slot 1 and wherever a new 24 VDC power supply potential group begins.
Do not deploy ET 200SP Standard or Basic interface modules; only High Feature (HF) interface modules are certified for PCS 7 driver generation.
Always validate final hardware modules, terminal BaseUnits, and software compatibility against the applicable Siemens catalog and authorized distributor quotation.

Engineer FAQ

Can ET 200SP be used with redundant S7-400H CPUs?

Yes. Using the IM 155-6 PN HF interface module, ET 200SP supports PROFINET System Redundancy (S2), connecting redundantly to both CPU racks over an MRP ring.

What is the difference between ET 200SP and ET 200MP?

ET 200MP uses S7-1500 form-factor cards and is designed primarily for centralized cabinets or S7-1500 systems. ET 200SP uses ultra-compact push-in terminal slices and is the primary distributed remote I/O standard for PCS 7.