| 主权项 |
1. A sensor connecting unit, comprising:
a safety input for connecting with a sensor, or, alternatively, a first sensor connected to a first safety input and a second sensor connected to a second safety input; a power supply that is controllable through a controllable power switch, or, alternatively, a controllable power supply; and a first I/O processing unit and a second I/O processing unit being connected to each other through a reciprocal comparison communication channel, wherein the first I/O processing unit and the second I/O processing unit are both connected through a measurement circuit to measure voltage, current or power between a reference input and the safety input and/or the second safety input, and are connected to a safety bus; wherein the first I/O processing unit has been configured to control the controllable power switch or, alternatively, the controllable power supply, and wherein the first I/O processing unit has been configured to inform the second I/O processing unit about switching of the power switch or, alternatively, of the controllable power supply, through the reciprocal comparison communication channel or an input line branched from a control line used to control the controllable power switch, or alternatively, the controllable power supply, and/or wherein the second I/O processing unit has been configured to command the first I/O processing unit to switch the power switch or, alternatively, of the controllable power supply, through the reciprocal comparison communication channel, and/or wherein the second I/O processing unit has been configured to measure an output of the controllable power switch or, alternatively, of the controllable power supply to detect switching of the power switch or, alternatively, of the controllable power supply. |
