Hi,
I may make an offer for a customer that needs 5 control cabinets for 5 skids and a main control cabinet for the PLC + HMI. They want to be able to connect to the main cabinet for automatic control to each skid, manual local control is with buttons and potentiometer for the speed of the onboard pump for example, in the local control case a connection to the main cabinet is not needed at that moment. The idea to connect to the main cabinet is with harting connections. I'm not really a fan of this concept, as you connect and disconnect signals for analogue and digital IO... connecting and disconnecting is not really okay IMO. Or you need to implement interface devices I think...
So, I was thinking in a different concept, to place a S7-1200 CPU in each cabinet and then with PUT en GET from the main cabinet do the communication. This way no IO on harting, only an ethernet cable...
My solution is more expensive offcourse, but its a more safe solution I think...
What do you guys think ?
Thanks,
Kind regards,
C
I may make an offer for a customer that needs 5 control cabinets for 5 skids and a main control cabinet for the PLC + HMI. They want to be able to connect to the main cabinet for automatic control to each skid, manual local control is with buttons and potentiometer for the speed of the onboard pump for example, in the local control case a connection to the main cabinet is not needed at that moment. The idea to connect to the main cabinet is with harting connections. I'm not really a fan of this concept, as you connect and disconnect signals for analogue and digital IO... connecting and disconnecting is not really okay IMO. Or you need to implement interface devices I think...
So, I was thinking in a different concept, to place a S7-1200 CPU in each cabinet and then with PUT en GET from the main cabinet do the communication. This way no IO on harting, only an ethernet cable...
My solution is more expensive offcourse, but its a more safe solution I think...
What do you guys think ?
Thanks,
Kind regards,
C