KOMUNIKASI ANTARMUKA PROGRAMABLE LOGIC CONTROLLER PADA MODBUS RTU SENSOR SUHU DAN KELEMBABAN UDARA DENGAN DATALOGGER

This study discusses systems that are widely used in industry to connect communications with equipment by Programmable Logic Controllers (PLC). Communication methods exist the generally use two methods, namely Modbus RTU and TCP/IP. In this study, method is form Master Slave components. between uses RS485 serial communication, basic function of protocol a temperature humidity sensor type XY-MD02 SHT20 which will be stored data logger able store as result implementation Object Datalogger PLC Software. order obtain according address has been given testing sampling for 1 minute results obtained communication system can work properly, then based on datalogger using Software Built-In Equipment PLC, an average produced 29.77° Celsius 73.88 % RH.