Siemens 6ES7414-4HR14-0AB0 CPU 414-4H

Redundant Controller for High-Availability Systems

This CPU provides fault-tolerant control for critical process applications. It supports redundant configurations with automatic failover for maximum uptime. Many plants choose this module for safety-critical and continuous operations. The unit offers seamless integration into S7-400H redundant systems.

Technical Specifications

Parameter	Specification
Model	6ES7414-4HR14-0AB0
Dimensions	125 mm × 130 mm × 70 mm (W × H × D)
Weight	0.80 kg
Power Supply	24 V DC (from backplane)
Power Consumption	3.5 W typical
Program Memory	2.5 MB (integrated RAM)
Data Memory	2.5 MB (integrated RAM)
Load Memory	8 MB (MMC card required)
Processing Speed	0.06 µs (bit instruction)
Bit Instruction Time	0.06 µs
Word Instruction Time	0.24 µs
Integer Math Time	0.24 µs
Floating Point Math	0.6 µs
Communication Interfaces	1 × PROFIBUS DP, 2 × MPI/DP
Transmission Rate (DP)	Up to 12 Mbps
Transmission Rate (MPI)	Up to 187.5 kbps
Redundancy Interface	Fiber-optic sync module (required)
I/O Address Space	16 KB input / 16 KB output
Number of Connections	64 maximum
Clock Speed	100 MHz
Operating Temperature	0°C to +60°C
Storage Temperature	-40°C to +70°C
Humidity Range	5% to 95% RH (non-condensing)
Protection Class	IP20
Certifications	CE, UL, cULus, FM

Redundant Architecture and Fault Tolerance

This CPU supports S7-400H redundant systems for maximum availability. Two CPUs operate in synchronized mode with identical programs. Automatic failover occurs without process interruption. This architecture ensures continuous operation in critical applications.

Processing Performance and Execution Speed

Bit instruction execution time reaches just 0.06 microseconds. Word and integer operations complete in 0.24 microseconds. Floating point math runs in 0.6 microseconds. This performance suits demanding high-speed control applications.

Memory Architecture and Storage Capacity

Program memory provides 2.5 MB of user logic storage. Data memory offers another 2.5 MB for process variables. A 8 MB MMC card handles load memory requirements. This large memory capacity supports complex automation programs.

Communication Interfaces and Network Integration

The CPU includes three communication ports for versatile connectivity. One PROFIBUS DP port connects to distributed I/O systems. Two MPI/DP ports support programming, HMI, and inter-CPU communication. The fiber-optic sync link enables redundant CPU synchronization.

Redundancy Synchronization and Link

A fiber-optic sync module connects the two redundant CPUs. This link maintains program and memory synchronization continuously. The system switches between CPUs automatically during faults. This feature ensures seamless transition without data loss.

Address Space and I/O Capacity

The CPU supports 16 KB of input and 16 KB of output address space. This capacity accommodates large distributed I/O configurations. Users can connect multiple PROFIBUS DP stations easily. The address space supports up to 64 connections.

Power Supply and Energy Consumption

The CPU draws 3.5 W from the S7-400 backplane. This moderate consumption suits redundant rack configurations. The real-time clock maintains time during power loss. A backup battery preserves retentive memory and clock data.

Certifications and Safety Standards

The 6ES7414-4HR14-0AB0 holds CE, UL, cULus, and FM certifications. These approvals confirm compliance with international industrial standards. Each unit undergoes extensive factory testing. This quality assurance ensures reliable redundant operation.