Procedures and Precautions for S7-417-5H Standalone Firmware Updates in PCS 7

Updating the firmware of a standalone S7-417-5H CPU (6ES7417-5HT06-0AB0) from V6.0.2 to V6.0.10 in PCS 7 V7.1 requires selecting the 'CPU_HD.UPD' file in HW Config, does NOT require booking back Process Objects (POs), and necessitates a complete project and hardware download. Because the CPU operates in standalone (non-redundant) mode, it must transition to STOP mode, which clears CPU work memory (RAM). Firmware flashing does not affect license keys stored on the engineering station, but hardware configuration, NetPro connections, and the full S7 program must be downloaded post-update.

Process Object Licensing and Firmware Package Architecture

Engineers planning firmware maintenance on SIMATIC PCS 7 systems frequently express concern regarding Process Object (PO) licenses.

In SIMATIC PCS 7 (including legacy V7.1 and modern releases):
* Process Object booking and license counting are managed strictly on the Engineering Station (ES) within the SIMATIC Manager project database and Automation License Manager (ALM).
* Process Objects are not stored in the physical flash memory or operational registers of the S7-417-5H CPU.
* Therefore, you do NOT need to perform "Book Back Process Objects" before updating CPU firmware. Flashing the operating system firmware has zero risk of erasing, consuming, or invalidating your engineering PO licenses.

When downloading a firmware update package from Siemens Industry Online Support (e.g., 4175HT06_V6010.exe), extracting the archive produces five distinct files with the .UPD extension:
* HEADER.UPD: Archive descriptor and checksum metadata.
* MEM1.UPD / MEM2.UPD: Hardware bootloader and internal communication processor sub-images.
* CPU_HD.UPD: The primary operating system container for the central processing unit.

When prompted by the Step 7 Firmware Update Wizard in HW Config to browse for the update file, always select CPU_HD.UPD. The wizard automatically parses HEADER.UPD and coordinates the sequential flashing of all internal memory components.

Operating Modes: Redundant vs. Standalone Firmware Updates

The necessity of a full project download depends entirely on operating redundancy:
1. Redundant H-System (2x CPUs in Sync): Supports Firmware Update in RUN. One CPU is updated while the partner runs the plant; after updating, redundancy syncs, mastership switches, and the second CPU is updated with zero process interruption and no complete download required.
2. Standalone CPU 417-5H (Single CPU in Rack): Because only one CPU is present, the controller cannot execute a redundant failover. The CPU must be switched to STOP mode. The firmware update clears the CPU work memory (RAM). Consequently, once firmware flashing concludes, the controller is completely blank:
* HW Config must be downloaded completely.
* NetPro Connections (Named Connections) must be downloaded.
* CFC/SFC Program must undergo a complete download (Entire program).

Follow this step-by-step procedure to flash the standalone CPU safely:
1. Perform a complete project backup via File -> Archive in SIMATIC Manager.
2. Place the CPU physical key switch to STOP.
3. Open the AS station in HW Config, select the CPU 417-5H, and click PLC -> Update Firmware.
4. Browse and select CPU_HD.UPD, then click Run. Allow flashing to complete without interruption.
5. Execute a manual Memory Reset (MRES) on the CPU.
6. Download HW Config, download NetPro connections, and perform a complete download of the AS program before switching the CPU to RUN.

Verification

In SIMATIC Manager, select the CPU and choose PLC -> Module Information.
Under the General tab, inspect the Firmware field. Confirm that the version displays V6.0.10.
Verify that the CPU transitions to RUN mode, RUN LED illuminates steady green, and all cyclic OB execution tasks resume.

Limitations and Operational Precautions

Never power down the automation station or disconnect the Industrial Ethernet / MPI cable during active EEPROM flashing. A power failure during writing can brick the internal flash memory, requiring factory repair.
Ensure that the engineering workstation's power management settings do not allow sleep or hibernation during the update process.
If the CPU utilizes an external Flash Memory Card (FEPROM) rather than battery-backed RAM, the user program must be written to the ROM card after downloading.

Engineer FAQ

Can a single S7-417-5H CPU be updated without plant downtime?
No. Redundant firmware updating in RUN requires two synchronized S7-417-5H CPUs connected via fiber-optic sync modules. A single CPU must stop.
Will the CPU keep its IP address after the firmware update?
The CPU typically retains its basic MAC address and network parameters in non-volatile memory, allowing the engineering station to reconnect over Ethernet; however, downloading HW Config re-establishes all network routes.
Why does unpacking provide five .UPD files instead of one?
The S7-417-5H is a multi-processor hardware platform containing distinct subsystem micro-controllers; each .UPD file represents a modular firmware segment coordinated by CPU_HD.UPD.

Technical References

SIMATIC S7-400H High-Availability Systems System Manual (A5E00267110-08).
Siemens Industry Online Support Entry ID 109801081: Operating Instructions for Firmware Updates on S7-400 Controllers.
S7-417-5H Firmware Release Notes and Revision History (6ES7417-5HT06-0AB0).

Related Tags

PCS 7, S7-417-5H, Firmware Update, HW Config, CPU 400, S7-400H, Process Objects, Maintenance

Procedures and Precautions for S7-417-5H Standalone Firmware Updates in PCS 7