1, basic conceptsWe are living in a material world. All substances contain chemical and physical properties, we are the apparent nature of the material to understand and own property of matter and motion characteristics. These apparent nature is what we used to say mass, temperature, velocity, pressure, voltage, current, the physical quantities expressed in mathematical … Continue reading Analog conversion method

When PLC program to keep in RAM when used batteries, the battery usually 3V or 3.6V non-rechargeable lithium-ion battery, battery life is usually about five years or so, the battery is used for a long time, the voltage will drop, when it dropped to less than to ensure that the data in RAM, the program … Continue reading PLC battery replacement when the best

Dead zone: also known as dead-zone width, control systems, some executing agencies if the action frequently, can result in slight shock, resulting in severe mechanical wear. From the control requirements, many systems also allow the controlled errors exist in a certain range. We allow the controlled size, width of dead zone known as PID;Dead-how does … Continue reading What is PID dead zone

PLC forms enter the external circuit of the external node is divided into the following three types:Passive node  1, input, namely: enter the switch node 2, NPN and PNP input3, diode input

1. Work environment(1) temperaturePLC required ambient temperature 0~55oC, installation cannot be placed in the heat element below, should be big enough ventilation space around.(2) climateIn order to ensure the insulation performance of PLC, the relative humidity of air should be less than 85% (no condensation).(3) motionPLC should be away from strong vibration source to prevent … Continue reading What needs attention in PLC application