waqas_here
Junior Member level 2
hopper filling
Guys i need Ladder Diagram for a PLC based Hopper filling system. The system operation is specified as below.
System consist of a main SILO through which 4 hoppers are feed using HOT CONVEYING process. Each hopper consist of Gate valve which can be open by energizing a coil and is spring return. safety needed to b considered. i-e during opening and closing of the gate valve conveying must be OFF to avoid any choking of material. The opening and closing of the gate valve is detected using 2 proximity sensors for each hopper. The process is as follows.
The hooper generates a demand signal when it needed to be feed. The PLC will generate a signal to open the gate valve of respective hopper and further vil check that all other 3 gate valves must b closed. In this case the plc will generate a signal "CONVEYING ON". and the feeding of respective hopper will start. When the demand signal vanishes the conveying must off and the gate valve must b closed.
Now if in the mean while another hopper generates a demand signal than it must wait for the process to complete in the previous hopper and than the feeding with the same procedure must start in 2nd hopper.
And lets suppose when feeding of 1st hopper is in process and mean while the another hopper generates demand and after a while 3rd hopper generates the demand as well than the feeding must be done demand wise. i-e 1st come 1st serve.
Guys i need Ladder Diagram for a PLC based Hopper filling system. The system operation is specified as below.
System consist of a main SILO through which 4 hoppers are feed using HOT CONVEYING process. Each hopper consist of Gate valve which can be open by energizing a coil and is spring return. safety needed to b considered. i-e during opening and closing of the gate valve conveying must be OFF to avoid any choking of material. The opening and closing of the gate valve is detected using 2 proximity sensors for each hopper. The process is as follows.
The hooper generates a demand signal when it needed to be feed. The PLC will generate a signal to open the gate valve of respective hopper and further vil check that all other 3 gate valves must b closed. In this case the plc will generate a signal "CONVEYING ON". and the feeding of respective hopper will start. When the demand signal vanishes the conveying must off and the gate valve must b closed.
Now if in the mean while another hopper generates a demand signal than it must wait for the process to complete in the previous hopper and than the feeding with the same procedure must start in 2nd hopper.
And lets suppose when feeding of 1st hopper is in process and mean while the another hopper generates demand and after a while 3rd hopper generates the demand as well than the feeding must be done demand wise. i-e 1st come 1st serve.