The objective of this project is the completion of a virtual PLC.
After some research i chose a circuit witch i found in the magazine elektor No. 204, which also contained links to the page of the author, on the Internet, where I found more information and references to the same assembly.
The referenced assembly, which i called virtual PLC, is a PLC implemented in two parts;
1) One part of Hardware, consists in 3 PCB boards:
The main board, which corresponds to the circuit for interface with the PC and selection circuits of inputs and outputs, done with the use of placement records, still incorporating IDC connector of 20 pins for connection to the boards of inputs and outputs. This board has the capacity of 32 inputs and 32 outputs.
The input board with capacity for 8 independent inputs and has also a 20 pins IDC connector for interface with the main board by a 20 wires plan cable. The link with the outside is made through 8 optical wavelength for a good insulation of the main board in relation to the outside.
The main board can support up to 4 input boards. The output board with capacity for 8 independent inputs and has also a 20 pins IDC connector for interface with the main board by a 20 wires plan cable. The outputs are switched through relays. The main board can support up to 4 output boards.
2) The other part is implemented on PC. The author of the project has established a program to control the virtual PLC that still incorporates an interpreter of the programming language "ladder." Therefore, the PC, where is made all the virtual PLC programming according to the task we want it to execute. In this case i chose to schedule it as irrigation PLC for garden.
After some research i chose a circuit witch i found in the magazine elektor No. 204, which also contained links to the page of the author, on the Internet, where I found more information and references to the same assembly.
The referenced assembly, which i called virtual PLC, is a PLC implemented in two parts;
1) One part of Hardware, consists in 3 PCB boards:
The main board, which corresponds to the circuit for interface with the PC and selection circuits of inputs and outputs, done with the use of placement records, still incorporating IDC connector of 20 pins for connection to the boards of inputs and outputs. This board has the capacity of 32 inputs and 32 outputs.
The input board with capacity for 8 independent inputs and has also a 20 pins IDC connector for interface with the main board by a 20 wires plan cable. The link with the outside is made through 8 optical wavelength for a good insulation of the main board in relation to the outside.
The main board can support up to 4 input boards. The output board with capacity for 8 independent inputs and has also a 20 pins IDC connector for interface with the main board by a 20 wires plan cable. The outputs are switched through relays. The main board can support up to 4 output boards.
2) The other part is implemented on PC. The author of the project has established a program to control the virtual PLC that still incorporates an interpreter of the programming language "ladder." Therefore, the PC, where is made all the virtual PLC programming according to the task we want it to execute. In this case i chose to schedule it as irrigation PLC for garden.
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