【Daily Question 20090412】In the production processes you are involved in, which part requires the most redundancy
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Please talk about your own production processes and system brands, and identify the part of those processes that requires the most redundancy – whether it’s controllers, IO devices, instruments, control valves, or process equipment. We hope everyone will organize their thoughts and speak freely, actively participating in the discussion; valuable insights from those who take part will be highly rewarded. Encourage originality
In my opinion, the areas that most need redundancy are the power supply and the controller. Redundancy should also be provided for the primary input and output points that are crucial in the process flow.
The CPU, communication, power supply, AO, and key AI points of DCS all require redundancy.
For on-site instruments: 1. Temperature measurement in the ammonia synthesis tower (hot spots, sensitive areas, catalyst layer); 2. Level measurement of waste heat fluid (on-site, remote). For control systems: 1. Main controller, power supply, communication systems; 2. I/O cards for the level measurement of various devices; 3. I/O cards for analytical instruments; 4. I/O cards for temperature measurement in the synthesis tower; 5. I/O cards corresponding to control valves
Network, power supply, main control I/O module; important valves on-site should have manual operation~
In my opinion, redundancy means having one unit in use and another as a backup~... But when it comes to valve redundancy, in situations where a valve fails or there is a lack of air or power supply, no matter how many backup valves you have, using a manual valve is still more convenient and reliable. Maybe I haven’t explained this clearly enough; manual valves are usually installed before or after control valves~. I think that’s what redundancy entails~~
Our company’s DCS (Yokogawa CS3000) uses dual redundancy for its power supply, CPU, communication, and output cards. The others are all single-card components, and no problems have occurred so far.
We use Yokogawa’s CENTUM-CS; the CPU and power supplies of the control stations are all redundant. Not long ago, there was a failure in one of the control station CPUs, but fortunately the system has dual redundancy, so it wasn’t affected
We use those from Hilscher. In my opinion, the power supply and controllers must be redundant, and the AI and AO systems at the important control points during production also need to be redundant.
Discuss the use of the Honeywell PKS 200 control system in the caustic soda industry: redundancy is required for power supplies, C200 controllers, IO cards (including RTD cards), and communication
Redundancy is required for the power supply unit, control unit, AO, critical AI circuits, operation station, etc.
DCS’s CPU, power supply unit, AO, control unit, communication modules, output cards, and so on
Communication, power supply, AO – redundancy is required for all critical AI components.
I wonder how everyone understands the concept of “most”. I think so. What typically requires redundancy are the power supply, CPU controller, control network communication, and Io bus. Important Io points. Field instruments, field actuators. It also includes the host computer. Pair it with a ‘most’ character – still the power supply. The foundation of all foundations.