PLC Troubleshooting
1. Keep Spare parts ready : In general, keep 10% spare parts ready for the number of that part used. So that if a part malfunctions, you need not search for a replacement at the eleventh hour. 2. About Fuse : If you replace the fuse and if it blows again then, the problem may be that the module’s output current limit is being exceeded or the output device is shorted. 3. Ground Loops When two or more electrical paths exist in a ground line, it is called a ground loop. For example, in the figure above, at the chassis or device enclosure, the transducer and transmitter are connected to the ground. The transmitter is connected to an analogue input card through a shielded cable. The shield connects to both chassis grounds. So, it creates a path for current to flow from one ground to another since both grounds have different potentials. The current flowing through the shield would induce magnetic fields in the signal transmission. This could create interference. Hence,...