备用点 spare point
- 不要花光你的所有,留点备用。
Don't use up all the things. Keep them in reserve. - 备用输出点可以连接其它的自动化设备,如输送 带和承接台等。
Spare output point can be connected to other automation equipment, such as conveyor and receiving station. - 断路器和接触器应至少有一对备用触点以便向控制系统传送信号。
Breaker and contactor should have one pair of spare contacts so that signals can be sent to the control system.
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