In a protective circuit for switching off a hazardous installation the aforementioned signaling devices are connected in series to a safety control device.
在用于关闭危险设备的安全电路中，这样的信号装置互相串联地连接到安全控制器。
In a protective circuit for switching off a hazardous installation the aforementioned signaling devices are connected in series to a safety control device.
在用于关闭危险设备的安全电路中，这样的信号装置互相串联地连接到安全控制器。
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