Siemens 6ES7960-1AA00-5AA0 S7-400H Sync Cable

Fiber-Optic Link for S7-400H Fault-Tolerant Systems

The Siemens 6ES7960-1AA00-5AA0 functions as a 1-meter fiber-optic synchronization cable for the SIMATIC S7-400H high-availability system. This cable establishes the critical communication link between the two CPUs in a fault-tolerant configuration, enabling them to operate in synchronized lockstep. Siemens identifies this product as a replacement part, suitable for maintaining existing S7-400H installations . The cable’s lightweight design, weighing approximately 40 grams, simplifies installation without adding significant bulk to the rack .

Technical Specifications

Specification	Value
Model	6ES7960-1AA00-5AA0
Product Type	Fiber-Optic Synchronization Cable
System Compatibility	SIMATIC S7-400H
Cable Length	1 m
Weight	Approx. 40 g
Fiber Type	Multimode 50/125 µm or 62.5/125 µm
Connector Type	LC-LC
Application	Indoor use
Order Number	6ES7960-1AA04-5AA0 for the newer generation of 1m cables

Installation and Important Notes

The Siemens 6ES7960-1AA00-5AA0 connects two synchronization modules within the S7-400H system . A fault-tolerant system requires four synchronization modules of the same type . The permitted bending radius for these prefabricated cables is 55 mm near the connector, 60 mm during installation, and 40 mm after installation . For proper startup, users must ensure the synchronization modules have different rack number settings . This cable is available as a spare part and may have been superseded by the 6ES7960-1AA04-5AA0 version in newer production runs .