Description
Technical Specifications 1X00781H01L
Digital input and output module (I/O module) is the key component of every PLC (programmable logic controller). Specifically, they assume the control, communication and actuation functions of PLC. But the challenges facing digital I/O modules are growing. These challenges arise from the growing need for flexible usage and a concurrent and intense battle for market share in system reliability.
Changing customer needs are also a factor. The IP protection and access restriction of the solution as well as its power consumption and system life play a decisive role in the battle for customers. Security is also becoming more important, especially in controlling drives. In today’s competitive market, long experience is essential, as are features such as simplicity, low maintenance costs, and secure data access.
One: PLC analog input module (analog input module), also known as A/D module, will be the field generated by the sensor detection of the continuous analog signal into the PLC CPU can receive the digital quantity, generally for 12 bits of binary number, the more digital quantity module, the higher the resolution.
Two: PLC analog output module. Analog output module is also known as D/A module, the PLC CPU sent to the analog output module of the digital amount into the external equipment can receive analog amount (voltage or current). The digital signal received by the analog output module is generally 12 bits of binary number. The more digital qubits the module has, the higher the resolution is. The digital quantity module is to detect the state of the external switch quantity input.
Three: Digital input and output signal is the switching signal, 0 or 1, analog signal, there are two, voltage or current signal, generally is the signal transmitted by the transmitter, such as the pressure transformer to detect the water pipe pressure, it will output an analog signal 4-20ma or 0-10V signal to PLC, PLC for data processing, This is the difference between digital input module and analog input module.
In the input sampling stage, PLC reads all the input status and data successively by scanning and stores them into the corresponding unit in the I/O image area. After the end of the input sampling, the user program execution and output refresh phase. In both phases, even if the input state and data change, the state and data of the corresponding cell in the I/O image area will not change. Therefore, if the input is a pulse, the width of the pulse must be greater than one scan cycle to ensure that the input can be read in any case.
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