YES WE CAN, and here is why:

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The Question is not the dPCs software. If a software is well-designed and well-debugged and tested during years, and not causing troubles at all, the software is perhaps the ideal choice. The next problem is the hardware executing the software. What has happend during the two decades the PC has been the big success. The PC has got new powerfull microprocessors and more reliable hardware, but the ISA and EISA bus is still the same robust connector and even more robust electronicly. How many PLC/PCS/DCS systems have a similar robust bus system today. Unfortunately the cost competition are forcing traditional PLC/PCS/DCS manufacturors to select weaker construction elements, placing the PC / Industrial PC solution even better. dPCs is controlling several hundred factory plants without problems. Among the most delicate dPCs applications are Approved Auto-Pilots and Maneuvre coordinators for ships.

> Redundancy in order to get reliability

Dependent on the process requirements one of the following equipment configurations can be chosen:

• No Standby: In the case that the system cost is of importance and the process and the production are non critical.
• Cold Standby: In the case that the system cost, here specially the application software, is of importance and the process is non critical, but the production is critical. The production loss is typically only 1..2 hours for problem detection and component change.
• Warm Standby: In the case that the system cost, here specially the application software, is of importance and the process is non critical, but the production is critical. The production loss is typically only some minutes until the expert operator has changed cable connection.
• Hot Standby: In the case that the process is critical. Redundant Industrial PCs and R-NET network solutions connected to special designed I/O hardware. The I/O hardware connected to the two redundant computers constantly compares the data received from the twocomputers. Strategies for data validation selects the reliable source in case of deviation. Such a system is very reliable, but the application software and hardware is expensive.

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