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S 400H
| Fault-tolerant
automation system with redundant design For applications with high fail-safety requirements Redundant central functions Increases availability of I/O: switched-I/O configuration Also possible to use standard-availability I/Os: single-sided configuration Hot standby: automatic reaction-free switching to the standby unit in the event of a fault Configuration with two separate or one divided central rack Connection of switched I/O via redundant PROFIBUS- DP The S7-400H functions according to the principle of active redundancy in "hot standby" mode (bumpless, automatic switching in the event of a malfunction). According to this principle, both subunits are active as long as there is no malfunction. If a malfunction occurs, the functioning controller takes over full control of the process. |
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