electronics

Consider the following Ladder Program that checks if a connection is enabled (A202.00) then send a message from the PLC to the PC. The documentation (Omron CX-Programmer) has a severe lack of explanation of the program convention. What I do not understand is: To send a message from a node to a node. I should need to specify the receiver ID. It seems the function block does not have an option where I can insert an IP address. Am I supposed to MOV an IP address to a DM address (D300) then use it? If that's the case how (IP address has dots in between 4 bytes..)? Can someone please explain what

I am creating a web-service which is aimed to simulate how do electronic circuits work. The project is not even in the Alpha stage yet. I am stuck with some important milestone of the project: when one tries to connect one component's pin to some other pin - the connection line should be built. First of all, the connection line was just a straight line, without almost any way to change it. Then it became somehow bended line with the possibility to add, move and delete points, which determined how the line is bended. And now it (connection line) is created using the A* algorithm. The

This question is mainly electronics related, but it also has a programming aspect. Some background on the problem We have a traffic light on a wall in our office. When people come in to the office, they can immediately tell from the traffic light whether last night's automatic build & test runs went smoothly: Green means all tests passed, yellow means some tests failed and red means some builds failed. Right now, there are three switches on three cables hanging from the traffic light and someone has to manually toggle these every morning. I'm looking for an easy way to automate this process