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  1. M

    Controlling a knife gate valve in structured text programming

    I want to control a valve where I have a solenoid (when the HIGH valve opens and when the LOW valve closes). It will control a few states, for example -Opened -Closed, -Opening, -Closing and -ErrorState There could be CommandOpen and CommandClose RPC. How can I implement it in structured text...
  2. M

    Are all SCADA systems OPC UA based?

    Not all, it depends on the SCADA. some use OPC, some Modbus, and some MQTT. There are many communication protocols.
  3. M

    Switching device from "Manual mode" to "Auto mode" and vice versa.

    May I know when you are switching to auto mode (by PLC) and when not. What are the exceptions you might have?
  4. M

    Switching device from "Manual mode" to "Auto mode" and vice versa.

    I feel I have the same mindset as tdamon. Somebody says PLC should remove the manual mode and start automatically (if it was left to manual mode) when it has a scheduled task to do provided there was no alarm in the device. On the other hand, somebody might leave the device in manual mode (for...
  5. M

    Switching device from "Manual mode" to "Auto mode" and vice versa.

    I meant it is an SW state (I am not sure if is it a common convention to HMI/PLC program to have this SW state). It can be applied to any device (for example, a valve, solenoid, pump, motor, etc). Any device can have a state (it can be initializing, starting, opening, manual mode, auto mode...
  6. M

    Switching device from "Manual mode" to "Auto mode" and vice versa.

    Hello Everybody! In our software, we have a feature "Hand mode". The meaning of this is for example if a pump is in "hand mode", we can start the pump manually but on the other hand, if the pump is in "auto mode", PLC can start according to schedule, and so on. If we leave the pump in "hand...
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