Currently, there are many signal conversion devices with different features to meet the control requirements of automatic systems. Each device is designed according to an input - output signal standard. Therefore, it needs to use a specific conversion method to connect different signal conversion devices. This study presents how to connect and process the output signal analog of a sensor with a Programmable Logic Controller - PLC S7-1200. The study finds out that the output analog signal of the sensor's converter such as: temperature, pressure, voltage, pulse signals from Encoder, etc. are input of PLC S7-1200. Based on the signal processing modules integrated in PLC programmable controllers, a control program is developed to receive output signals on demand.