C135 PCS 7 (PCS7)
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Fail-Safe I/O Compatibility and F-AI Module Limitations in PCS 7 with ET 200SP Racks

Fail-Safe I/O Compatibility and F-AI Module Limitations in PCS 7 with ET 200SP Racks

Standard factory-automation ET 200SP fail-safe analog input modules (such as F-AI 4xI 6ES7136-6AA00-0CA1) are not released or supported in SIMATIC PCS 7 with S7 F-Systems, and cannot be added to the PCS 7 HW Config catalog. While discrete fail-safe modules (F-DI, F-DO) have qualified support in ET 200SP HF racks, safety-related analog input processing in PCS 7 requires either the process-automation-tailored SIMATIC ET 200SP HA line using the fully released F-AI 8xI HART HA module (6DL1136-6AA00-0PH1) or classical SIMATIC ET 200M fail-safe signal modules (SM 336). All safety hardware must be verified through an authorized Siemens distributor or the Siemens Industry Mall.

Table of Contents

Executive Summary

When designing safety-instrumented systems (SIS) in SIMATIC PCS 7 (such as PCS 7 V9.0 SP1/SP2 with S7 F-Systems V6.2 and F-Configuration Pack V5.5), system integrators often attempt to standardize remote I/O on standard ET 200SP High Feature (HF) racks. While discrete fail-safe input (F-DI) and output (F-DO) modules can be configured, engineers discover that the standard fail-safe analog input module (F-AI 4xI, MLFB: 6ES7136-6AA00-0CA1) is completely absent from the PCS 7 Hardware Catalog. This absence is intentional: standard ET 200SP F-AI modules are engineered for TIA Portal Safety Advanced, not for the driver generator and S7 F-Systems architecture of PCS 7. Implementing safety analog loops in PCS 7 mandates deploying ET 200SP HA F-modules or legacy ET 200M F-systems.

Architecture and Fundamental Mechanics

The architectural incompatibility between standard ET 200SP F-AI and PCS 7 S7 F-Systems involves driver generation, channel diagnostics, and release testing:

1. S7 F-Systems Driver Generator Architecture

In SIMATIC PCS 7, fail-safe signal processing does not use raw I/O addressing. Instead:
- The CFC compiler and the 'Generate Module Drivers' wizard parse HW Config and automatically instantiate fail-safe channel drivers (e.g., F_CH_AI, F_CH_DI) from the S7 F-Systems library.
- These drivers interface with hardware diagnostic blocks (F_MOD_...) to evaluate PROFIsafe communication, wire break, short circuit, and passivated channel states.
- Standard ET 200SP F-AI modules lack the necessary metadata descriptors and F-Driver support in S7 F-Systems V6.2/V6.3, preventing automated driver compilation.

2. The Official PCS 7 Solution: SIMATIC ET 200SP HA

To support high-density fail-safe analog signals in modern PCS 7 environments, Siemens developed the ET 200SP HA line:
- Released Module: ET 200SP HA F-AI 8xI 2-/4-wire HART HA (MLFB: 6DL1136-6AA00-0PH1).
- Fully integrated into PCS 7 V9.0 SP3 / V9.1 with S7 F-Systems V6.4 and S7 F-Systems Library V1.3 SP4.
- Features 8 HART-enabled fail-safe analog channels certified up to SIL 3 / Cat. 4 / PLe, supporting redundant interface modules and hot-swapping during plant operation (Run mode).

3. The Proven Alternative: SIMATIC ET 200M

For plants maintaining established hardware platforms, the classical ET 200M SM 336 F-AI 6x0/4...20mA HART (6ES7336-4GE00-0AB0) remains fully supported across all PCS 7 releases.

Step-by-Step Implementation Procedure

To correctly engineer safety-related analog inputs in SIMATIC PCS 7:

Step 1: Select the Compliant Hardware Platform

  1. Evaluate plant lifecycle and cabinet footprint requirements:
    - Recommended Modern Platform: SIMATIC ET 200SP HA utilizing redundant interface modules (IM 155-6 PN HA).
    - Alternative Legacy Platform: SIMATIC ET 200M utilizing redundant active backplanes and IM 153-2 interface modules.
  2. Prohibit procurement of standard factory-automation ET 200SP F-AI modules (6ES7136-6AA00-0CA1) for PCS 7 projects.

Step 2: Install Hardware Update Packages (HUP) and F-Config Pack

  1. Download and install the latest F-Configuration Pack on the Engineering Station.
  2. Install the ET 200SP HA F-Module Hardware Update Package (HUP) corresponding to your PCS 7 release (e.g., PCS 7 V9.0 SP3 or V9.1).
  3. In HW Config, select Options -> Update Catalog.

Step 3: Configure ET 200SP HA F-AI Module in HW Config

  1. Open HW Config on the ES and navigate to the PROFINET IO system.
  2. Insert the ET 200SP HA station.
  3. From the hardware catalog (PROFINET IO -> I/O -> ET 200SP HA -> F-Modules), drag F-AI 8xI HART HA (6DL1136-6AA00-0PH1) into the rack.
  4. Configure PROFIsafe parameters: F-Source Address, F-Destination Address, and monitoring time.
  5. Configure channel parameters: 2-wire vs 4-wire transducer, HART enable, and sensor evaluation.

Step 4: CFC Engineering with S7 F-Systems

  1. Open the safety CFC chart.
  2. Interconnect process tags to the F_CH_AI fail-safe analog channel driver block.
  3. Execute 'Generate Module Drivers' during CFC compilation to auto-generate diagnostic drivers.

Verification

To confirm fail-safe analog compliance:

  1. HW Config Consistency Check:
    - In HW Config, click Station -> Check Consistency.
    - Verify that all PROFIsafe addresses are validated with zero errors.

  2. CFC Safety Compilation:
    - Compile the safety program in CFC. Confirm that F-System CRC signatures match across all safety runtime groups.

  3. Online Diagnostics and Loop Test:
    - Connect a calibrated 4-20 mA current loop calibrator to Channel 0.
    - Verify that the process value reads accurately in the safety CFC chart and that open-circuit testing triggers channel passivation cleanly.

Limitations and Operational Precautions

Operational limitations and precautions:

  1. Do Not Force TIA Modules via GSD: Attempting to force standard ET 200SP F-AI modules into PCS 7 via generic GSD/GSDML files breaks automated module driver generation, precluding safety certification under TÜV guidelines.
  2. HUP Version Dependencies: ET 200SP HA F-modules require S7 F-Systems V6.4 or specific project releases on earlier PCS 7 versions.
  3. Cabinet Temperature Ratings: Standard ET 200SP modules are rated $0^\circ\text{C}$ to $+60^\circ\text{C}$, whereas ET 200SP HA is hardened for $-40^\circ\text{C}$ to $+70^\circ\text{C}$.
  4. Commercial Disclaimer: Verify all safety hardware MLFBs, F-Systems licenses, and safety certifications with an authorized Siemens distributor or the Siemens Industry Mall.

Engineer FAQ

Why isn't the ET 200SP F-AI 4xI module in the PCS 7 HW catalog?

The standard ET 200SP F-AI module is designed exclusively for TIA Portal Safety Advanced. It is not released or supported by the PCS 7 S7 F-Systems driver generator.

Which fail-safe analog input module is released for PCS 7 on modern remote I/O?

The SIMATIC ET 200SP HA F-AI 8xI HART HA module (MLFB: 6DL1136-6AA00-0PH1).

Can I use standard ET 200SP discrete safety modules (F-DI, F-DO) in PCS 7?

Certain discrete ET 200SP F-modules have qualified support in ET 200SP HF racks with appropriate FConfig Packs, but ET 200SP HA remains the strategic standard.

What channel driver block processes safety analog inputs in PCS 7?

The fail-safe channel driver block F_CH_AI from the S7 F-Systems library.

What is the maximum safety rating of the ET 200SP HA F-AI 8xI module?

It is certified up to SIL 3 according to IEC 61508 and Cat. 4 / PLe according to ISO 13849-1.

Technical References

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Related Tags

  • ET 200SP HA
  • F-Systems
  • Fail-Safe Analog
  • PROFIsafe
  • Safety Instrumented Systems
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