Can sequential control be achieved this way?
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When controlling the mixing motor via an inverter, input 1 corresponds to forward rotation, input 2 to reverse rotation, and input 5 to stop. Can the following program achieve the following operation: after pressing sxSTART, it starts rotating forward at 1000 revolutions per minute for 30 seconds, then reverses direction for 20 seconds, and finally stops? If this program is to implement loop control, stopping only after the stop button is pressed, then what needs to be done?
This post was last edited by hxch150804 on 2021-11-1 08:05. Is this program segment DCS? I’m not sure how you manage to achieve so many functions by using DCS to drive the frequency converter. For example, speed can be controlled through a frequency setpoint signal, but for other parameters, do you use a single output to the frequency converter so that it can recognize and process those values? And then control the forward and reverse rotation of the inverter? It can also be understood as an analog signal, but inverters do not have this function. I think you’d better explain the requirements in detail, such as whether it is to be operated via a DCS Still PLC? What brand of inverter? Could you mention the specific model? Including DCS, we can also discuss that, so as to provide you with a practical solution.
The control of the DCS is carried out through a 248 card; the frequency converter receives digital signals in the form of unsigned integers. A value of 1 indicates forward rotation, 2 indicates reverse rotation, and 5 indicates stop – thus speed control is possible!
Add an AND gate; the output of P23.8 is inverted, and the inversion of P23.1 enables P23.9 and P23.10