最近在学plc , 有一道作业 一直做不好。求大家帮忙看看。
A large 3 phase motor has a restricted duty cycle and must not be started more than 5 times in 1minute ( to prevent overheating ).
develop a ladder to accomplish this starting the motor DOL.
Should the motor be started 5 times within 1 minute , then it must not then be able to be started again until a further 2 minutes have elapsed .
一个电机直接接电源的, 在一分钟之内不能启动超过5次, 如果超过了 就要等2分钟以后才能启动。