Siemens SIMATIC S7-400H CPU 412-5H Redundant Processor 6ES7412-5HK06-0AB0

roduct Overview

The Siemens 6ES7412-5HK06-0AB0 functions as a high-performance CPU 412-5H specifically engineered for the SIMATIC S7-400H and S7-400F/FH redundant safety systems. Primarily, this processor drives fault-tolerant automation architectures where system availability is critical to preventing process interruptions. Consequently, it serves as the central intelligence for redundant “Hot Standby” configurations, allowing two CPUs to operate in parallel with synchronized data. By utilizing its advanced multi-processor capability, the 6ES7412-5HK06-0AB0 ensures that industrial plants remain operational even if a primary hardware failure occurs.

Technical Performance and Functional Features

• Integrated Redundancy Logic: In addition to its standard PLC tasks, the module manages the automatic synchronization of the event-driven user program. As a result, the hardware supports a bumpless failover, meaning the standby CPU assumes control within milliseconds without affecting the process output.
• Extensive Communication Interfaces: Furthermore, the 6ES7412-5HK06-0AB0 features five integrated interfaces, including a combined MPI/PROFIBUS DP port and a dual-port PROFINET interface with an integrated switch. Thus, it effectively facilitates high-speed networking with distributed I/O and supervisory HMI systems.
• Large Program and Data Memory: To handle complex industrial code, the processor provides 1 MB of work memory, split into 512 KB for program logic and 512 KB for data. Moreover, this memory capacity ensures that the CPU maintains rapid execution speeds for large-scale floating-point arithmetic and organizational blocks.
• Fail-Safe Operation Support: Regarding safety, the 6ES7412-5HK06-0AB0 supports F-programs for safety-instrumented systems (SIS). Consequently, it enables the integration of standard control and safety-related tasks within a single hardware platform, reducing overall system complexity and footprint.
• Synchronization via Fiber Optics: To maintain perfect alignment between redundant pairs, the module utilizes specialized sync modules and fiber-optic cables. Therefore, the CPU pair remains synchronized over distances up to 10 km, providing flexibility for geographically distributed control rooms.

Operational Compatibility and Integration

System engineers seamlessly deploy the 6ES7412-5HK06-0AB0 into UR2-H or UR1 racks to create a fault-tolerant station. In addition to its hardware durability, the module integrates fully with the STEP 7 engineering toolset, which streamlines the process where users develop redundant logic and manage safety certifications. Furthermore, because this processor complies with the highest international standards for electromagnetic compatibility and vibration resistance, it successfully satisfies the reliability demands of the offshore oil, nuclear power, and chemical processing industries. Ultimately, these features combine to provide a resilient and scalable foundation for mission-critical automation.

Technical Specifications Summary

• Manufacturer: Siemens
• Model Designation: CPU 412-5H PN/DP
• Order Number: 6ES7412-5HK06-0AB0
• Product Family: SIMATIC S7-400H / S7-400F/FH
• Work Memory: 1 MB (512 KB Program / 512 KB Data)
• Processing Times: 31 ns (Bit Operation), 62 ns (Word Operation)
• Interfaces: 1x MPI/DP, 1x PROFINET (2-port switch), 2x Slots for Sync Modules
• Max I/O Capacity: 16,384 Digital / 1,024 Analog