题目

英语翻译
When defining the rules,refer back to the list of field devices developed.Start with the output instructions and work backward to define the condition that produces the desired action.It is important to remember that emergency-stop switches should not be programmed in the programmable controller.Only a hardwired master control relay provides a reliable means for emergency shutdown.These emergency devices should therefore be documented as such.When writing,the text needs to use language that helps convert the operating characteristics to ladder logic.For instance,the AND logic function connects condition instructions in series on a ladder diagram rung,while the OR logic function connects inputs in parallel.
Addressing all elements of a ladder diagram involves identifying and labeling inputs and outputs with a letter/numerical designation.Use an “I” to indicate inputs and an “O” for outputs.(Designating O for zero will prevent confusion between O for output and the number ze

提问时间：2020-08-10

答案

当定义规则,参考前面的现场设备的名单中发展.开始与输出指令和工作落后的情况下定义生产预期的行动.重要的是要记住,emergency-stop开关不应该安排上,可编程控制器.只有硬布线主人控制继电器提供了可靠的手段,紧急停...