Posted 23 Apr 2016 I am doing a Induction motor protection through PLC. Now i am in the studying stage of this project. I have 9 analog input and one digital output. Help me about analog input module that how many analog input cards are needed, cost of each card and which PLC is best to achive these analog inputs. Share this post Link to post Share on other sites
Posted 27 Apr 2016 Completely dependent on the controller platform. Rockwell CompactLogix, Rockwell ControlLogix, Mistusibishi, Omron, Automation Direct... All analog input cards are going to convert analog inputs to a bus that a controller communicates with. Next question, analog current (4-20mA, 0-20mA) or analog voltage (0-5VDC, 0-10VDC, +/-5VDC, +/-10VDC). Not all analog input modules are switch hitters. When tasked with a design application, start with the end game first...specifications. Share this post Link to post Share on other sites