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SIMATIC S7-400H, CPU 417H
Central processing unit for
S7-400H 4 interfaces: 1 MPI/DP, 1 DP
and 2 for sync modules 30 MB memory (15 MB data/15 MB program)
The 6ES7417-4HT14-0AB0 is a central processing unit belonging to the SIMATIC S7-400H fault-tolerant controller family.This hardware serves process industries, plant automation, and redundant DCS structures, ensuring system uptime and zero-interruption bumpless switchovers during hardware failures.
15 MB Program (Code) Memory: Dedicated exclusively to user logic execution, accommodating highly complex sequence controls and massive block calls
15 MB Data Memory: Allocated for data blocks, variables, recipe management, and historical trends, preventing data traffic from impacting processing times
Combined MPI/DP: Standard integrated RS 485 port operating at up to 12 Mbps. It functions as a programming/HMI port (MPI) or as a primary PROFIBUS DP master/slave node
The CPU 417H forms the core of the SIMATIC fault-tolerant system by utilizing an advanced "Hot Standby" architecture. Through the dual dedicated synchronization interfaces, two identical CPUs run the same user program in absolute lockstep, continuously synchronizing internal registers, timers, and I/O image tables via high-speed fiber-optic links. In the event of a primary CPU failure, the backup controller takes over control within milliseconds without any loss of process data. This bumpless transfer ensures that critical loops—such as chemical reactions, power generation, or oil gas pipelines—remain perfectly stable and completely unaffected by hardware faults.
Built for massive computational loads, the CPU delivers rapid execution speeds with bit operations clocked at mere nanoseconds, ensuring deterministic loop updates even when managing thousands of PID loops simultaneously. The integrated operating system features comprehensive diagnostic buffers that automatically log hardware errors, network disturbances, and program execution exceptions. Furthermore, the CPU natively supports extensive self-test routines that detect internal memory parity errors or communication timeouts before they can lead to an unsafe plant state, making it the ideal choice for SIL-rated safety and high-availability operations.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Siemens 6ES7417-4HT14-0AB0 Central processing unit Manuals, Datasheets, Drivers, Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Oil & Gas Refining
Managing complex temperature, pressure, and flow loops across large towers, where any CPU failure would cause catastrophic chemical instability or shutdowns.
Nuclear Power
Running redundant loop logic for backup cooling water and radiation ventilation tracking, ensuring zero-downtime environmental protection.
Thermal & Hydro Power Generation
Regulating high-pressure steam distribution and turbine synchronization to the power grid, requiring high reliability and sub-millisecond hot-standby switchover.
Iron & Steel Metallurgy
Controlling the continuous hot-blast environment and raw material charging sequences, where power or controller failure would freeze molten iron.
Pharmaceutical Bio-Reactors
Maintaining precise environmental conditions (pH, temperature, dissolved oxygen) over weeks-long batches, preventing millions of dollars in product spoilage from a single fault.
Mining & Ore Processing
Synchronizing high-power multi-motor drives over kilometers and managing interlocking valves to prevent pipeline blockages.
When using the 6ES7417-4HT14-0AB0 (CPU 417H), ensure that both redundant CPUs have identical firmware, hardware versions, and memory card capacities to avoid synchronization failure. Power must be turned off when installing or replacing the rear fiber-optic sync modules, and excessive bending of fiber cables must be avoided.
Since this model is discontinued, regularly check the rack backup batteries to prevent program loss, closely monitor the REDF (Redundancy Fault) LED status, and stock sufficient original spare parts for emergency replacement.
6ES7417-4HT14-0AB0 is the flagship CPU 417H for Siemens SIMATIC S7-400H large-scale redundant systems. Designed for zero-downtime critical sectors like oil, chemical, and power plants, it features a massive 30 MB work memory, integrated MPI/PROFIBUS DP ports, and dedicated fiber-optic sync slots to support seamless microsecond-level dual-processor switchover.
It is the core Central Processing Unit (CPU 417-4H) in the Siemens SIMATIC S7-400H (High Availability / Fault-Tolerant) control system, primarily used in critical industrial sectors where production downtime is unacceptable.
How much work memory does 6ES7417-4HT14-0AB0 have?
It features a total of 30 MB of work memory, with 15 MB allocated for the program and 15 MB for data.
What physical communication interfaces are built into 6ES7417-4HT14-0AB0?
It integrates 1 combined MPI/DP interface, 1 independent PROFIBUS DP interface, and 2 slots designated for fiber-optic synchronization modules.
How to use redundant control products like 6ES7417-4HT14-0AB0?
They must typically be used in pairs (two identical CPUs). The two CPUs are connected using fiber-optic synchronization modules and patch cords, and installed on either two separate racks or one split rack to run in synchronization.
Does 6ES7417-4HT14-0AB0 support PROFINET (Ethernet) communication?
This specific model (Firmware V4.5) does not have a built-in PROFINET interface. If Ethernet communication is required, an external Ethernet module like the CP443-1 must be added.
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Disclaimer: We are not an authorized distributor or distributor of the product manufacturer of this website, The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because our company is not an authorized distributor of this product, the Original Manufacturer`s warranty does not apply.While many DCS PLC products will have firmware already installed, Our company makes no representation as to whether a DSC PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. Our company also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from our company, its distributors, or any other source. Our company also makes no representations as to your right to install any such firmware on the product. Our company will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.
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