该文件为ORCAD绘制的通用开关量板电路原理图，可以兼容N多种数字电路，采用24V直流供电，输出电流0-50mA可以驱动大部分弱点开关，接触器，继电器，指示灯，步进电机等，具有隔离抗干扰，常闭或常开可自主选择，多达12路数字量输出的优点。-The document for the general switch ORCAD drawing of the circuit board schematics, can be compatible with N variety of digital circuit, the use of 24V DC power supply, the output current of 0-50mA can drive most weakness switch, contactor, relay, lights, such as stepper motor, with isolation interference, normally closed and normally open can choose, as many as 12 the advantages of digital output.