模擬量輸入/輸出接口一般用來感知傳感器產(chǎn)生的信號。這些接口可用于測量流量、溫度和壓力，并可用于控制電壓或電流輸出設(shè)備。這些接口的典型量程為-10～+10V、0～+11V、4～20mA或10～50mA。一些制造廠家在PLC上設(shè)計有特殊模擬接口，因而可接收低電平信號，如RTD、熱電偶等。一般來說，這類接口模塊可用于接收同一模塊上不同類型的熱電偶或RTD混合信號。

在選擇一臺PLC時，用戶可能會面臨一些特殊類型且不能用標(biāo)準(zhǔn)I/O實現(xiàn)的I/O限定（如定位、快速輸入、頻率等）。此時用戶應(yīng)當(dāng)考慮供銷廠商是否提供有有助于限度減小控制作用的模塊。有些特殊接口模塊自身能處理一部分現(xiàn)場數(shù)據(jù)，從而使CPU從繁重的任務(wù)處理中解脫出來。2021 年“十四五規(guī)劃”開局，中國數(shù)字化轉(zhuǎn)型的落地進(jìn)入關(guān)鍵的“拐點”階段，與此同時，在“ 3060 碳目標(biāo)”的要求下，中國制造企業(yè)轉(zhuǎn)型升級迫在眉睫。然而，落實到具體應(yīng)用，IT 與 OT 的數(shù)字融合問題依舊是橫亙在制造企業(yè)轉(zhuǎn)型面前的“大山”，數(shù)據(jù)價值難以充分發(fā)揮。

Analog input/output interfaces are generally used to sense signals generated by sensors. These interfaces can be used to measure flow, temperature and pressure, and can be used to control voltage or current output devices. Typical ranges for these interfaces are -10 to +10V, 0 to +11V, 4 to 20mA, or 10 to 50mA. Some manufacturers have special analog interfaces designed on the PLC, so that low level signals can be received, such as RTD, thermocouples, etc. In general, this type of interface module can be used to receive different types of thermocouple or RTD mixed signals on the same module.

When choosing a PLC, the user may face some special types of I/O restrictions that cannot be implemented with standard I/O (such as positioning, fast input, frequency, etc.). At this point, the user should consider whether the supplier provides a module that helps to minimize the control effect. Some special interface modules can process part of the field data themselves, so that the CPU can be freed from heavy task processing. At the beginning of the “14th Five-Year Plan” in 2021, the landing of China’s digital transformation has entered a key “inflection point” stage, at the same time, under the requirements of the “3060 carbon target”, the transformation and upgrading of Chinese manufacturing enterprises is imminent. However, when IT comes to specific applications, the digital integration of IT and OT is still a “mountain” in front of the transformation of manufacturing enterprises, and the value of data is difficult to give full play to.