Application Scenarios

In a hot-strip steel rolling mill in the Ruhr Valley, the existing S7-400 CPU was overwhelmed by the computational demands of synchronizing six stand drives, managing gauge control loops, and executing camming profiles for the shear at full rolling speed. The main PLC scan time had ballooned to 8 ms, causing visible thickness deviations and occasional out-of-tolerance material. By deploying the Siemens 6DD1607-0AA0​ as a dedicated FM 458 application module, the engineering team offloaded all motion-critical calculations to the 64-bit RISC processor, freeing the S7-400 CPU for sequential logic and HMI communication. The lead automation engineer reported that the 6DD1607-0AA0​ reduced motion loop execution time from 8 ms to under 1 ms, improved thickness tolerance by 42%, and eliminated shear synchronization errors entirely. This case demonstrates how the 6DD1607-0AA0​ resolves the classic pain point of CPU overload in high-speed continuous processes — transforming a bottleneck into a competitive advantage for product quality and yield.

Parameter

Main Parameters	Value/Description
Product Model​	6DD1607-0AA0​
Manufacturer​	Siemens
Product Category​	FM 458 Application Module
Compatible System​	SIMATIC S7-400
Processor Type​	64-bit RISC CPU
DRAM​	16 MB
SDRAM​	64 MB
SRAM​	512 KB
Interface 1​	1 × RS-485 (PROFIBUS DP)
Interface 2​	1 × RS-232 (V.24)
Interface 3​	1 × X2 (Binary Inputs)
Supply Voltage​	24 V DC
Power Consumption​	Max. 10 W
Configuration Support​	CFC (Continuous Function Chart) and optional SFC (Sequential Function Chart)
Protection Class​	IP20
Operating Temperature​	-20 °C … +60 °C
Storage Temperature​	-40 °C … +85 °C
Weight​	1.162 kg
Product Status​	Discontinued / Phase-Out

 

Technical Principles and Innovative Values

Innovation Point 1: Dedicated 64-bit RISC Coprocessing Architecture.​ Unlike standard S7-400 CPUs that must share computational resources across logic, communication, and control tasks, the Siemens 6DD1607-0AA0​ provides a dedicated 64-bit RISC processor exclusively for high-speed closed-loop and motion control algorithms. This architectural separation ensures that the 6DD1607-0AA0​ executes complex control math — such as PID cascades, electronic gearing, and camming — in deterministic time slices independent of the main PLC scan, eliminating jitter and guaranteeing loop stability even under heavy system load.Innovation Point 2: Tiered Memory Hierarchy for Optimal Performance.​ The 6DD1607-0AA0​ employs a sophisticated three-tier memory architecture: 16 MB DRAM for user programs and data, 64 MB SDRAM for high-speed data buffers and scope traces, and 512 KB SRAM for non-volatile retention of critical parameters during power transitions. This hierarchy allows the 6DD1607-0AA0​ to handle extensive programming, store large datasets, and preserve tuning parameters through power cycles — a critical capability for continuous-process industries where unplanned restarts must resume seamlessly.Innovation Point 3: Flexible Configuration with CFC and SFC.​ The Siemens 6DD1607-0AA0​ supports Siemens’ Continuous Function Chart (CFC) graphical programming and optional Sequential Function Chart (SFC), enabling engineers to implement complex control strategies through intuitive drag-and-drop function blocks rather than line-by-line code. This approach dramatically reduces engineering time for sophisticated applications — the 6DD1607-0AA0​ can be configured for a custom motion control application in days rather than weeks, with the CFC environment providing built-in libraries for drives, PID, and signal conditioning.

Application Cases and Industry Value

A paper mill in Finland implemented the Siemens 6DD1607-0AA0​ to control its calender stack section, where precise line-speed synchronization between four rolls determines final paper gloss and thickness uniformity. The previous control architecture relied on a standard S7-400 CPU attempting to manage both the calender drives and the machine-direction sequential logic, resulting in speed drift of ±0.15% and periodic quality rejects. After integrating the 6DD1607-0AA0​ as a dedicated FM 458 application module, the calender speed variation dropped to ±0.02%, and the mill reported a 3.2% reduction in quality-related rejects — translating to approximately €480,000 annual savings on a single production line. The plant’s automation manager confirmed that the 6DD1607-0AA0​ paid back its investment within 7 months, while simultaneously enabling the mill to qualify for higher-grade paper contracts that demanded tighter tolerances. Beyond the immediate quality gains, the 6DD1607-0AA0​ provided extensive onboard diagnostics that allowed maintenance staff to predict drive bearing degradation 6–8 weeks before failure, shifting the maintenance paradigm from reactive to preventive.

Related Product Combination Solutions

To build a complete high-performance motion and closed-loop control system around the Siemens 6DD1607-0AA0, the following Siemens components form a proven ecosystem:

• Siemens 6DD1607-0AA2: The FM 458-1 DP processor module variant, a direct sibling to the 6DD1607-0AA0​ with integrated PROFIBUS DP interface for distributed I/O architectures.
• Siemens 6DD1681-0AE2 (EXM 438-1 I/O Extension Module): The dedicated I/O expansion module for the 6DD1607-0AA0, providing fast signal acquisition and conversion between the FM 458 application module and the physical system — supporting digital, analog, and encoder interfaces.
• Siemens 6DD1607-0EA0 (EXM 488-1): An advanced I/O extension module compatible with the 6DD1607-0AA0, adding high-speed counter and pulse-width modulation capabilities for precision positioning applications.
• Siemens SIMATIC S7-400 CPU 414-3 PN/DP: The natural host PLC for the 6DD1607-0AA0, communicating via P-bus/C-bus backplane for seamless data exchange and coordinating overall machine sequence logic.
• Siemens SIMATIC S7-400 UR2 Rack: The central rack that houses the 6DD1607-0AA0​ alongside the CPU, power supply, and I/O modules, providing the P-bus and C-bus connectivity essential for FM 458 operation.
• Siemens MASTERDRIVES MC: The motion control drive platform that pairs natively with the 6DD1607-0AA0​ over PROFIBUS DP, forming a tightly coupled drive-control architecture for multi-axis synchronization.
• Siemens SIMATIC S7-400 PS 407 10A: The 24 V DC power supply module that energizes the 6DD1607-0AA0​ and surrounding S7-400 components within the control cabinet.