Verifying S7-400H CPU 417-4H Hardware Compatibility and Firmware Requirements in PCS 7 V9.0

Migrating a SIMATIC PCS 7 V7.0 plant to PCS 7 V9.0 while retaining legacy CPU 417-4H controllers requires verifying the specific MLFB and firmware version in the Siemens Released Modules catalog. Only CPU 417-4H hardware release 6ES7417-4HT14-0AB0 with Firmware V4.5.x is compatible with PCS 7 V9.0. Older versions, such as 6ES7417-4HL01-0AB0 or 6ES7417-4HL04-0AB0, are discontinued and unsupported under V9.0 engineering tools. When retaining 6ES7417-4HT14-0AB0, communication is limited to PROFIBUS DP and Industrial Ethernet via CP 443-1; native PROFINET system redundancy (S2) and advanced firmware architectures require migrating to CPU 410-5H (6ES7410-5HX08-0AB0). Validate all hardware lifecycle statuses and firmware compatibility with an authorized Siemens distributor or the Siemens Industry Mall.

Executive Summary

Plant modernization from PCS 7 V7.0 to PCS 7 V9.0 represents a generational shift in operating systems, engineering tools, and hardware support. Operating teams frequently evaluate whether legacy high-performance S7-400H controllers, specifically the CPU 417-4H, can be retained to reduce capital expenditure. While PCS 7 V9.0 centers on the AS 410-5H platform, certain later-generation CPU 417-4H units remain compatible as legacy controllers under strict firmware and configuration constraints. This guide provides the exact compatibility boundaries, firmware upgrade prerequisites, communication architectures, and engineering limitations when operating CPU 417-4H under PCS 7 V9.0.

Architecture and Fundamental Mechanics

The hardware lifecycle rules in SIMATIC PCS 7 govern controller compatibility across major platform versions:
1. Hardware Release Generations:
- Legacy Generation 1 & 2 (Discontinued): CPU 417-4H units with MLFB 6ES7417-4HL01-0AB0 (Firmware V3.1) and 6ES7417-4HL04-0AB0 (Firmware V4.0) reached end-of-support prior to PCS 7 V8.2 and are completely blocked in PCS 7 V9.0 HW Config.
- Generation 3 (Compatible): CPU 417-4H unit 6ES7417-4HT14-0AB0 is the only variant listed in the 'PCS 7 Released Modules (V9.0)' catalog. It requires operating system Firmware V4.5.0 or higher (recommended V4.5.7).
2. Memory and Architecture Differences:
- Unlike modern AS 410-5H controllers that utilize dynamic work memory managed by a System Expansion Card (SEC), CPU 417-4H relies on fixed onboard work memory (30 MB: 15 MB code, 15 MB data) and physical RAM/Flash memory cards.
- CPU 417-4H lacks onboard PROFINET interfaces. Field communication relies strictly on integrated PROFIBUS DP interfaces or external communication processors (CP 443-1 for Industrial Ethernet).
3. Redundancy and Library Support:
- CPU 417-4H supports Advanced Process Library (APL) V9.0, provided memory utilization remains within controller boundaries.
- Native PROFINET IO system redundancy (S2/R1) is unsupported on CPU 417-4H. High-availability field I/O must remain on redundant PROFIBUS DP (ET 200M with IM 153-2) or utilize PN/DP Couplers.

Step-by-Step Implementation Procedure

Audit Existing Physical Controller Hardware:
a. Inspect the physical front label and optical status indicators of both redundant CPUs.
b. Record the full 16-character MLFB and current firmware release from the rating plate or via STEP 7 PLC -> Diagnostics/Setting -> Module Information.
c. Confirm the MLFB is exactly 6ES7417-4HT14-0AB0. If the controller is 6ES7417-4HL01-0AB0 or 6ES7417-4HL04-0AB0, plan a hardware replacement to CPU 410-5H.
Upgrade Controller Firmware to V4.5.7:
a. If the CPU is running Firmware V4.1.x, V4.2.x, or V4.3.x, download the official firmware container for 6ES7417-4HT14-0AB0 (Siemens SIOS Entry ID 109476041).
b. Prepare a compatible Siemens Flash Memory Card or execute an online firmware update via STEP 7 HW Config while the plant is in an authorized maintenance outage.
c. Perform the firmware update consecutively on CPU 0 and CPU 1.
Verify PCS 7 V9.0 Hardware Catalog Integration:
a. Open SIMATIC Manager on the PCS 7 V9.0 Engineering Station.
b. Open HW Config for the AS station and verify the hardware catalog path: SIMATIC 400 -> CPU 400 -> CPU 400-H -> CPU 417-4H -> 6ES7417-4HT14-0AB0 -> V4.5.
c. Verify that redundant optical sync submodules (e.g., 6ES7960-1AA04-0XA0) match installed fiber optic cables.
Configure Communication Subnets:
a. Assign PROFIBUS DP redundant master systems for ET 200M distributed I/O racks.
b. Configure CP 443-1 (e.g., 6ES7443-1EX30-0XE0) modules for ISO/TCP plant bus communication with redundant WinCC OS Servers.
Execute Station Compilation and Memory Check:
a. In HW Config, execute Station -> Save and Compile.
b. In CFC, open Options -> Chart Reference Data -> Statistics to verify that code and data memory do not exceed the 15 MB limit of CPU 417-4H under APL V9.0 block footprint.

Verification

In STEP 7 HW Config online, open 'Module Information' for both CPU 417-4H units: verify operating mode is RUN-Redundant and firmware indicates V4.5.x.
In SIMATIC Manager, execute a test chart compilation: confirm compilation succeeds with zero block type mismatch errors.
Verify that all distributed PROFIBUS DP ET 200M stations report healthy active communication without bus fault (BF) or system fault (SF) LED indicators.

Limitations and Operational Precautions

CPU 417-4H units cannot run PROFINET S2 redundant ring topologies and are limited to PROFIBUS DP field networks. Work memory cannot be expanded beyond 30 MB. For new plant expansions or PROFINET architectures, Siemens recommends transitioning to CPU 410-5H.

Engineer FAQ

Can CPU 417-4H MLFB 6ES7417-4HL04-0AB0 be used in PCS 7 V9.0?

No. The 4HL04 hardware generation is discontinued and unsupported in PCS 7 V9.0. Only MLFB 6ES7417-4HT14-0AB0 with Firmware V4.5 is released.

Does CPU 417-4H require a System Expansion Card (SEC)?

No. SEC cards are exclusive to the CPU 410 platform. CPU 417-4H utilizes conventional fixed work memory and standard S7 memory cards.

Can I use PROFINET distributed I/O with CPU 417-4H in PCS 7 V9.0?

CPU 417-4H lacks onboard PROFINET ports. While a CP 443-1 can provide basic Industrial Ethernet communication, redundant PROFINET S2 field architectures cannot be operated.

Can I use PCS 7 Advanced Process Library (APL) V9.0 on a CPU 417-4H?

Yes, APL V9.0 is fully supported on CPU 417-4HT14 V4.5, provided total chart memory does not exceed the controller's 30 MB work memory capacity.

What optical sync modules are used with 6ES7417-4HT14-0AB0?

Standard sync submodules (such as 6ES7960-1AA04-0XA0 for up to 10 m or 6ES7960-1AB04-0XA0 for long distance up to 10 km) installed in the sync subslots.