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Answer is yes . opc servers is one such solution for this
yes , it makes the control system more flexible
To connect elements of a SCADA system, first you will need to choose and use a communication network.
On the a.m. bus you can connect several elements (atention: if you have an old point to point communication network then it's only 2 elements on the network).
With all the actual field buses you can inter connect dozens of PLC's (Programable Logic Controllers), HMI (Human Machine Interfaces), SCADA Servers and Clients, VSD (Variable Speed Drives), etc.
yes we can connect the same PLC cpu to HMI and SCADA together using suitable protocol.
Nowadays, HMI's are integrated with SCADA ( all in one). You can connect PLC with a screen which represents both by means of Ethernet or Profibus DP protocols.
To do so, PLC must have a communication port and HMI/SCADA also must have the same. HMI must have a software which carry on communications between both ( as WINCC by SIEMENS)
Yes , we can connect HMI (Human Machine Interface) and SCADA to a PLC. You can connect by using Ethernet or DP protocols.
yes we can connect more than 1 HMI and SCADA to single PLC. The maximum limit depends upon the communication protocol used.
yes i can. the coded signals are linked with proper communcation channels(plc) which are then presented graphically through hmi
