Questions regarding the function block outputs (MV) of the CS3000
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I would like to ask everyone: in the description of the function block outputs in CS3000, there are position-type outputs and speed-type outputs. What does a speed-type output mean? In what situations is it used? Additionally, does output clamping mean that when the MV output exceeds the MH value or falls below the ML value, the MV state changes to CLP+ or CLP-? Thank you
This post was last edited by jlshnlhj on 2018-1-22 at 11:39. It’s easier to understand MV as an incremental type. It’s the original MV plus △MV. For general position-type outputs, it is necessary to select tracking during configuration, while this is generally not required for incremental types. The meanings of CLP+ and CLP- are basically correct. But at the same time, when MV=MH or MV=ML, the module displays CLP+ or CLP, indicating that the output MV has been clamped at MH or ML.
Oh, thanks to jlshnlhj upstairs for the answer! Do you mean “measurement tracking” by tracking? It has 3 options: man, aut, and cnd, as well as cas and cnd. We usually choose yes for cas and cnd, and no for the first two options. Does it mean that SP tracks PV when it is set to man (or aut, cas, etc.)? Or is it the superior’s MV tracking the subordinate’s CAS IN (CSV)?
The last edit to this post was made by jlshnlhj on 2018-1-23 at 10:28, and it deals with output tracking. Generally, terminal connection and output tracking are set automatically by default; for position-type outputs, it is sufficient to pay attention to them during configuration. Measurement tracking is SP tracking PV (within this module). Output tracking is the CAS IN (CSV) under MV tracking (between preceding and following stages). After reading the CS 1000 CS 3000 Reference Function Block Details.PDF, you will understand everything; Yokogawa’s IM documentation is very detailed.
Thank you, master jlshnlhj, for your excellent answer. What you said is that the output tracking between the terminals of hierarchical function blocks is automatically set by default, and no special configuration is required, right? But when the CSV value of a lower-level functional block is being tracked by an upper-level functional block, how does the upper-level functional block reverse-calculate the MV value of that lower-level functional block and then pass it on to an even higher-level functional block? Is it \"output inversion\"? SP tracking is generally used when switching from manual to automatic mode to prevent sudden changes in output. So, for the measurement tracking in the PID block, it should be set to ‘man’, right? But I’ve seen that many people don’t select this option; even the default setting isn’t chosen. Does anyone have documentation on the IM D3~D8 function blocks? In my Chinese version of the documents, there are no illustrations at all, so I can’t see them. Thank you
This post was last edited by jlshnlhj on 2018-1-24 at 10:57. Check out CS 1000 CS 3000 Reference Function Block Details.PDF; explanations are provided for C1 through D8. Individual modules are slightly different. Also, for Yokogawa’s IM materials, don’t rely on the Chinese version – the translations are inaccurate and can lead you astray.
Okay, thank you so much, master jlshnlhj – I’ve already downloaded it! ~