Siemens S7 400H

In China, Siemens S7 400H with on-hand stock adopts a hardware redundancy architecture, supporting dual-machine hot standby for CPU, power supply, and network. The switching time is less than 100ms, ensuring no disturbance and no data loss. It is equipped with high-performance H-CPU and supports dual-network redundancy of PROFINET/DP and SIL3 safety level. It is a solid foundation for ensuring the uninterrupted operation of key equipment in factory automation.

Core configuration

The Siemens S7-400H redundant architecture includes CPU 412H/414H/416H/417H and CPU 410-5H. It adopts a dual-CPU hot standby design, enabling the switching time between the primary and backup systems to be less than 100 milliseconds. The working memory can reach 1 to 32MB, the instruction execution speed is 15 to 62.5 nanoseconds, and the interfaces integrate MPI/DP and PROFINET. A single station can support up to 256 IO devices. It supports configuration using STEP 7 V5.5+ or TIA Portal, and is fully compatible with the S7-400F safety system.

Typical system hardware composition

Frequency converter light fault alarm description

In the industrial automation site controlled by S7-400H, it is usually combined with Siemens frequency converters. During the debugging and operation maintenance of the frequency converter, if there are minor faults, they usually include transformer over-temperature alarm, cabinet temperature over-temperature alarm, cabinet door opening and unit bypass situations. These will not be recorded but only fault indications will be issued. Once the fault disappears, the alarm will automatically be cleared. If minor faults occur during operation, the machine will not be stopped. When a minor fault alarm occurs, normal startup and operation are still allowed.

We certify

The Siemens S7-400H has undergone multiple certifications, fully meeting the CE standards and obtaining the UL/cUL safety certifications for the North American market, allowing for safe application in Zone 2 potentially explosive environments. It has passed theTÜV institution's SIL 3 and AK6 safety integrity level certifications based on the IEC 61508 standard, meeting the stringent requirements of DCS and SIS systems for high availability and fault safety.

Why choose us?

The support is a dual-rack, dual-CPU hardware redundant architecture, which can achieve automatic and seamless switching within milliseconds when a single component fails. It seamlessly integrates the "hot-swapping" function and powerful I/O expansion capability, and can perfectly meet large-scale and highly complex control requirements. It is often used in the fields of power, petrochemicals, and metallurgy. If you are interested in our models or want to know more about them, our Yueyang Tongtu can provide them for you. As a large-scale supplier, we offer models with low prices and high quality.

Q&A

Q: Can the S7‑400H be configured in TIA Portal?

A: No. The S7‑400H series CPUs are not supported in TIA Portal. They can only be configured in STEP 7 Classic (e.g., V5.5) or in the PCS 7 process control system.

Q: How to select the S7‑400H for harsh environments?

A: For corrosive gases: the standard S7‑400H can theoretically be used in G3 corrosion protection class environments. If the corrosion is more severe, the SIPLUS series 400H products are recommended.

For high altitude: the standard 400H can operate below 2000 m. Between 2000 m and 3000 m, it may be possible with enhanced heat dissipation measures. 

For altitudes higher than 3000 m, the SIPLUS series must be used, which supports altitudes from 1000 m to +5000 m.

Q: What types of memory cards are supported by the S7‑400H?

A: Both RAM cards and FLASH cards are supported. The main difference is: RAM cards lose the program after power off and require a backup battery to retain data. FLASH cards can retain the program without power, but still need a backup battery to keep bit memory, timers, and other data.