Let’s see if my understanding is correct; I’m not entirely sure about what the ISL symbol means
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This post was last edited by A Entropy on 2022-4-24 at 11:21. 1. Two thermal resistors or thermocouples TE are used for redundancy purposes, that’s why two of them are employed. 2. Both TEs are connected to the TC; the function of the TC is to receive the output from the TE and then, using a set value, to control the output in order to regulate the heater. 3. TSH and TSL are likely to be switches for high/low temperatures; the symbol following them indicates connection to the control system DCS for interlocking purposes. 4. TAH is a high-temperature alarm. 5. I assume ISL relates to current, and the SL following it has the same meaning as TSL – it is a switch for low current. 6. IAL indicates a low current alarm on the ISL. Please take a look; my assumptions regarding ISL and IAL are completely speculative. By the way, do you know what the scientific name of TC is? Has anyone used it? Please recommend a brand and model. Thank you all!
The concepts of ISL and IAL are generally understood correctly, but TC is misunderstood; TC refers to the temperature control logic, which is a logical relationship implemented within the controller, and it is not a physical component
Okay, so it’s something like PLC or DCS, right?
The last edit to this post was made by Tian Dan Yun Shu on 2022-4-24 at 15:05. TC is the on-site temperature controller; its signals are sent to the DCS for display. This is a system for controlling the temperature through electric heating, with temperature and current alarms also being sent to the DCS
Two temperatures, one used for the interlock of the DCS or PLC, and the other for controlling the collector
Thank you, very helpful information. :handshake
This post was last edited by A Entropy on 2022-4-24 at 16:29. Uh, thanks. I have a question: earlier someone mentioned that TC is something similar to a PLC or DCS, and in the diagram both devices are connected to TC. If TC is actually a DSC, then does it mean that only one temperature value needs to be sent to the DCS in order to enable interlocking and control of the heat collector? Two different ways of understanding it: 1. TC is a physically existing controller that controls the output based on the input from TE. Another TE is connected to the DCS for interlocking; both TEs are connected to the DCS for redundancy, and the control of the collectors is carried out through the DCS. Which of the two above is correct