Description

The Siemens 6DD2920-0AQ0, known as the SU70 Synchronization Module, is a specialized high-performance control unit engineered for the Siemens SIMADYN D digital control system platform . This module serves as the “time commander” for complex, multi-axis industrial automation architectures, ensuring microsecond-level synchronization across distributed processors and drive controllers .

The Siemens 6DD2920-0AQ0 is specifically designed to solve the “time difference” problem inherent in large-scale coordinated drive systems . By distributing a global clock signal via the dedicated GDM (Global Data Memory) fiber-optic bus, the SU70 ensures that all connected processors sample inputs and execute control outputs simultaneously . Equipped with a 32-bit microcontroller and comprehensive memory (1 MB Flash, 2 MB RAM, 32 KB EEPROM), this module delivers the deterministic performance required for demanding motion control applications .

 

Application Scenarios

In a high-speed hot strip rolling mill with ten finishing stands, the Siemens 6DD2920-0AQ0 is the critical component that ensures perfect synchronization between each stand’s drive controller. In such applications, even a few milliseconds of timing deviation can cause strip breakage (cobbles), leading to costly production interruptions and equipment damage . Before deploying the SU70 synchronization architecture, the mill experienced frequent cobble incidents due to communication latency between the main controller and individual drive processors.

After integrating the Siemens 6DD2920-0AQ0 as the central master clock, the system achieved sub-microsecond synchronization across all ten stands . The module broadcasts a precise timebase via the GDM fiber-optic network, ensuring that every stand’s speed and tension control loop executes within the exact same sampling window. The plant’s engineering team credited the Siemens 6DD2920-0AQ0 with enabling them to push production speeds beyond previously achievable limits while maintaining product quality.

 

Parameters

Main Parameters	Value/Description
Product Model	6DD2920-0AQ0
Designation	SU70 (Synchronization Unit)
Manufacturer	Siemens AG
Product Category	Synchronization Module / Digital Control Module
Platform	SIMADYN D
Processor	32-bit microcontroller @ 32 MHz
Memory	1 MB Flash, 2 MB RAM, 32 KB EEPROM
Synchronization Accuracy	< 1 µs (microsecond-level)
Jitter	< 100 ns
Communication Interface	GDM Fiber-Optic Bus (BFOC), RS-485
Operating Temperature	-20°C to +60°C
Power Consumption	≤ 2.5W
Weight	0.38 kg – 0.468 kg
Dimensions (L×W×H)	4.5 × 15.9 × 15.6 cm
Lifecycle Status	Discontinued / Legacy Product