Siemens 6ES7960-1AA04-0XA0 Sync Submodule

High-Availability Synchronization for Redundant Systems

The Siemens 6ES7960-1AA04-0XA0 functions as a synchronization submodule for the SIMATIC S7-400H high-availability PLC system. This module ensures seamless data exchange and state synchronization between the two redundant CPUs. It maintains consistent operation during switchover events and prevents data loss during transitions. The module uses fiber-optic cables to provide high-speed and interference-free communication between the CPU units.

Key Technical Specifications

Parameter	Specification
Product Model	Siemens 6ES7960-1AA04-0XA0
Brand	Siemens
Category	PLC Redundancy Module / Sync Submodule
Product Family	SIMATIC S7-400H
Version	V4 (Version 4)
Function	Synchronization of two S7-400H CPUs
Connection Type	Fiber-optic cables (duplex)
Communication Speed	High-speed data exchange
Data Consistency	Synchronous data mirroring
Power Supply	Via the S7-400H CPU (no external power needed)
Fault Tolerance	Supports redundant, fault-tolerant system operation
Mounting	Plugs into the dedicated sync slot on the CPU
Indicators	LED status indicators
Operating Temperature	0°C to 60°C
Storage Temperature	-40°C to 70°C
Protection Class	IP20

Synchronization Capabilities and Redundant System Integrity

The Siemens 6ES7960-1AA04-0XA0 enables automatic synchronization of the user program and process data between the two CPUs. This ensures seamless system operation, even if one CPU fails. The fiber-optic connection provides high-speed data exchange and protects against electrical interference.

System Integration and Configuration

This submodule fits into the dedicated SYNC slot on the S7-400H CPU. The user connects the two CPUs via a fiber-optic cable. System configuration defines the synchronisation behavior.

Physical Design and Installation

The submodule is a small, plug-in board. It requires no external power supply. The two fiber-optic connectors provide a secure connection.

Application Suitability

This submodule is essential for building a redundant S7-400H system. It ensures high system availability for critical processes. The module suits applications where downtime is not acceptable.