PLC analog input module - Input circuit

Input in the form of circuit 

PLC input circuit classification, according to the type of programmable logic controller manufacturer‍ power supply, can be divided into the DC input circuit and the AC input circuit; Press PLC input module common terminal (COM client) current flow can be divided into source and drain input circuit input circuit; by plc analog input output module‍ emitting diode common connection method can be divided into common anode and common cathode input circuit.‍

Ensure PLC analog input modules work

We know, PLC analog input module in order to prevent interference generated by the external circuit (e.g., voltage spikes, the interference noise, etc.) caused by abnormal operation of the PLC plc sequence of events recording module‍ a damaged components, generally in the PLC input side plc industrial controller‍ are used to cut off the PLC Contact the internal circuit and external electrical circuit to ensure the normal operation of the PLC. And in the input line has a RC filter circuit to prevent false signals due to the input jitter or pulse caused by external interference.

plc analog input modules features:

1, collecting multiple plc analog input modules, using industrial terminals, support rail mounting. 

2,485 interface input connected to the computer, and plc power supply module provide optical isolation. 

3, using MODBUS programmable logic controller (plc) suppliers communication protocol, enabling customers to unify PC management platform. 

4, analog modules can be cascaded by 485 to use, easy system expansion.

plc analog input modules defined explanation:

plc analog input modules is any value within a continuous range of variation, with the state of the digital representation is opposed. Typically used to capture and represent the analog of things, such as voltage and current, or frequency parameters. The analog input module is a possible acquisition of analog (such as voltage, current, thermocouple, plc digital input output module, temperature and other values​​) is transferred to a plc intelligent controller via a smart module 485. Its uses MODBUS RTU communication protocol agreement with the industrial data acquisition to achieve a unified docking program is also very easy.

plc analog input modules technical parameters:

1, 8-way acquisition AI ones 

2, collecting voltage range :china programmable logic controller DC 

3, collecting current range :4-20 mA 

4, the maximum sampling frequency of 20 times / sec. 

5, the serial port baud rate defaults to plc digital output, customers can also specify settings for other baud rate. 

6, plc analog input modules for the 9-12V DC power supply with overvoltage overcurrent protection against reverse function.