bonnyng

Hi Bryll, Thank you so much. I'm trying to find an analog Humidity sensor component now. I hope I can figure out this problem. In the worst case, I might use I2C protocol combining with microprocessor, but I really don't think much about it. Thanks for your help again. Best Regards.

Hi Bryll, Thank you so much for you attention. Using PLC with sensor humidity is one of my input parameter to control a system including many inputs. I've read PLC siemiens manual, they've shown that PLC siemens can work with both digital and analog input signal. I think I have to spend more time to figure out how to use it. Do you have any suggestion or should I start from what to due with this problems? Thanks again Best Regards.

Hi mechatronic_hieu, Thank you so much for you reply. I want to read digital signal from SHT11 humidity sensor, SHT11 have 4 pins, include Vcc, GND, serial clock input and serial data bidirectional. I want to know exactly does PLC siemens S4 can read digital signal directly and what are the functions, blocks (LAD) need to transfer the signals. I want to read humidity so that I can use this data to control some output actions, maybe it is a comparison with a constant number to create a signal level. Best regards Bonnyng

Hello everyone, I am a freshman, studying about PLC. I work with S7-400 system. Please help me how to read digital input signal directly from humidity sensor using PLC. Thank you so much. Best regard!