Siemens 6ES7960-1AA04-0XA0 S7-400H Sync Module

This is a critical synchronization component for high-availability S7-400H redundant PLC systems. It ensures both CPUs operate in perfect unison.

Core Function & Importance

• Enables data synchronization between two S7-400H CPUs.
• Version V4 module for use with patch cables up to 10 meters.
• Essential for building fault-tolerant, redundant control systems.
• Compact design for installation within the central rack.
• A key spare part for maintaining system availability.

Detailed Product Specifications

Brand: Siemens
Order Code: 6ES7960-1AA04-0XA0
Product Name: SIMATIC S7-400H Synchronization Submodule V4
Type: Redundancy Synchronization Module
For System: S7-400H High Availability PLC
Compatible Cable: Special sync patch cable (up to 10m length)
Module Version: V4
Current Consumption: Max. 210 mA (from CPU rack)
Power Loss: Typical 1.1 W
Dimensions (W x H x D): 25 x 53 x 140 mm
Weight: Approx. 65 g (0.065 kg)
Mounting: Installs in the central controller rack
Function: Manages real-time data exchange and clock synchronization between the redundant CPU pair.

Package Includes

You will receive: 1 x Siemens 6ES7960-1AA04-0XA0 Synchronization Module V4. Sync cables are sold separately.

Warranty Information

This module is covered by our 12-month warranty.

Shipping Options

We ship worldwide via FedEx, UPS, and DHL. This sensitive component is packed with care.

Expert System FAQ

What is the purpose of the 6ES7960-1AA04-0XA0 in an S7-400H system?

It is the hardware link that allows the two redundant CPUs to constantly update each other with process data and internal states, so if one fails, the other can take over without interruption.

What happens if this sync module fails?

The synchronization between CPUs is lost. The system will typically trigger a fault and may switch to single-CPU operation, losing its high-availability redundancy until the module is replaced.

Do I need one or two of these modules?

You need two modules—one installed in the rack of each of the two redundant CPUs (CPU 0 and CPU 1). They are connected to each other via the special sync cable.

What is the difference between V4 and other versions?

Version V4 modules are designed to work with specific, newer sync cables supporting lengths up to 10m. They are not compatible with older, longer fiber-optic cables used with earlier module versions.

Can I extend the sync link beyond 10 meters?

No, not with this V4 module and its associated patch cables. For longer distances (up to 10km), you would need a different synchronization setup, typically using older modules with fiber-optic cables.

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