Seeking help with some issues related to Tricon
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Dear fellow sailors, I have recently been learning about *T-day modules and have encountered a few issues; I hope you can offer your guidance. 1. When studying digital input modules, there is a passage that states: \"DC digital input modules with self-testing capabilities can detect the condition of ‘ON stuck’ – that is, when the module’s measurement circuit cannot detect a disconnection in the field signal. This is an important feature for safety systems.\" Because the vast majority of safety systems use “de-magnetization tripping”. •When an input fault is detected, the measured input value is forced to a safe state. Since Tricon is more suitable for “de-magnetization trip” systems, it can force the value of each branch circuit to the “OFF” (de-magnetized) state when a fault is detected in the input circuit. What do “ON stuck” and demagnetization trip mean here? What is meant by a “stuck-on” fault, or in other words, how should this phrase be understood? What is the purpose of this function?
It gets stuck – for example, if you want to increase the speed of your compressor, you click the speed-up button and the compressor’s speed rises. Once it reaches the desired speed, you release the button, but the system doesn’t detect that the button has been released; it seems as though the button is stuck and can’t be released. The compressor will continue to speed up. As for why sticking occurs, it is mainly related to the scanning time; I can’t recall the more detailed mechanism at the moment. If this happens, don’t panic; you can click to increase the speed again and then release it. You can contact Kangjisen to ask; they explain things quite clearly. Now, this issue has been resolved.
In TRICON, the \"stuck on\" condition can be understood as follows: when the external switch at the DI terminal changes from closed to open, a fault in the internal circuit of the DI card prevents detection of this change. As a result, the program in the CPU continues to treat it as being in the ON state, which prevents the shutdown interlock from being activated – a situation that is extremely dangerous. Therefore, the DI card is equipped with this FORCE OFF detection function.
What LZ is talking about isn’t that situation at all
I’m new to this field and don’t understand it very well yet. I’ve read about it in books, and I think it might be useful, but I just haven’t grasped it