Study*-DCS-004- How do the engineer station and operator station communicate with the DCS?

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This post was last edited by wang_qia on 2016-11-10 18:47. Question 1: What are the physical differences between the engineer station and the operator station, and are there any differences in the interface types? How are the microprocessor systems and DCS systems in the engineer’s station and operator’s station of the control room connected? Is there physical communication isolation, or is it just software-based isolation? Under what circumstances can the equipment of an engineer station be downgraded to an operator station? Under what circumstances can the equipment on the operator station be upgraded to that on the engineer station? Enthusiastic netizens provided organized answers: Question 8. What are the physical differences between the engineer station and the operator station, and are there any differences in the interface types? How are the microprocessor systems and DCS systems in the engineer’s station and operator’s station of the control room connected? Is there physical communication isolation, or is it just software-based isolation? Under what circumstances can the equipment of an engineer station be downgraded to an operator station? Under what circumstances can the equipment on the operator station be upgraded to that on the engineer station? Answer 8: Nowadays, DCS systems use network cables to connect the engineer station and the operator station. As for the communication protocols, different manufacturers use varying ones. Generally, as long as a computer has the authorization for an engineer station, it can be used as such; the same applies to the operator station. If both are available, one device can serve as both. Question 9: But does this so-called authorization refer to two accounts within a software program – an engineer account and an operator account – where logging in with different accounts grants different levels of access? The physical communication line remains 100MB/S Ethernet communication. Answer 9: It can’t be assumed simply that this is the case. The software installed on the engineer station is different from that installed on the operator station, and the authorization methods vary among different manufacturers – some use hardware tokens while others use software tokens. For example, the VP&CS3000 from Yokogawa uses software tokens. The software that is installed depends on the authorization level granted; the system I used before from Zhejiang University Control Systems used hardware tokens. Question 10. Can the engineer station change the process program, and can the operator also modify the process parameters? Answer 10: The operator station and the engineer station are generally only different in terms of software; there is no physical difference between them. The difference between accounts and permissions. For example, with Honeywell’s TPS3000, it’s sufficient to log in with an account; when process requirements call for changes, I switch accounts at the operation station to make those modifications. 【There are also cases where the software installed on the engineer station and the operator station may be different, and the permissions must be distinct as well. The engineer station can generally be used as an operator station, but the reverse is not possible. Some necessary documents may also be stored on the computer at the engineer’s station. 】 Automatic control instruments