CodeLearner
Member
Hi I'm new here. Setting up plc control and interfacing via scada .
Most basic scada packages for the pc are not recommended for critical or complex control , I have many questions in this area, one is how do I go about interfacing a basic plc via a VB6 SCADA (to be written by myself when i learn how ) to update the set point of a pid loop , put the loop in manual and back to automatic mode ? My thinking is that a basic old plc like a hitachi 200 series would be difficult to achieve this from a vb6 self written scada interface. By the way even the simple routine to update a digital output seems difficult to me as the plc also controls the same output what is the mechanism exactly one could use to achieve "seemless" transition of logic wether it be induced by the plc code itself or the vb 6 scada code.
I am thinking to get an off the shelf scada package, but the same issue will be present that way too, as i would still need to know how to transfer setpoint settings, auto manual etc without upsets , has anybody done this with vb and a basic plc.
thanks so much in advance for help on this.
Most basic scada packages for the pc are not recommended for critical or complex control , I have many questions in this area, one is how do I go about interfacing a basic plc via a VB6 SCADA (to be written by myself when i learn how ) to update the set point of a pid loop , put the loop in manual and back to automatic mode ? My thinking is that a basic old plc like a hitachi 200 series would be difficult to achieve this from a vb6 self written scada interface. By the way even the simple routine to update a digital output seems difficult to me as the plc also controls the same output what is the mechanism exactly one could use to achieve "seemless" transition of logic wether it be induced by the plc code itself or the vb 6 scada code.
I am thinking to get an off the shelf scada package, but the same issue will be present that way too, as i would still need to know how to transfer setpoint settings, auto manual etc without upsets , has anybody done this with vb and a basic plc.
thanks so much in advance for help on this.