Safety device, valve arrangement and method

A valve arrangement, comprising a safety device for industrial automation, the safety device comprising a logic voltage zone, a load voltage zone which is galvanically separated from the logic voltage zone, a transmission unit for transmitting a communication signal between the logic voltage zone and the load voltage zone whilst maintaining the galvanic separation, a first voltage supply connection for providing a first supply voltage for the logic voltage zone, and a first current limitation element, wherein the transmission unit is connected to the first voltage supply connection via the first current limitation element and is fed from the first voltage supply connection via the first current limitation element, the valve arrangement further comprising a valve unit which is controlled via the load voltage zone.

A system, comprising a safety device for industrial automation, the safety device comprising a logic voltage zone, a load voltage zone which is galvanically separated from the logic voltage zone, a transmission unit for transmitting a communication signal between the logic voltage zone and the load voltage zone whilst maintaining the galvanic separation, a first voltage supply connection for providing a first supply voltage for the logic voltage zone, and a first current limitation element, wherein the transmission unit is connected to the first voltage supply connection via the first current limitation element and is fed from the first voltage supply connection via the first current limitation element, the system further comprising a first voltage supply to which the first voltage supply connection is connected, and a second voltage supply for providing a second supply voltage for the load voltage zone, wherein the second voltage supply has a shut-off function for shutting off the second supply voltage whilst maintaining the first supply voltage.

A method for operating a safety device for industrial automation, the safety device comprising a logic voltage zone, a load voltage zone which is galvanically separated from the logic voltage zone, a transmission unit for transmitting a communication signal between the logic voltage zone and the load voltage zone whilst maintaining the galvanic separation, a first voltage supply connection for providing a first supply voltage for the logic voltage zone, and a first current limitation element, wherein the transmission unit is connected to the first voltage supply connection via the first current limitation element and is fed from the first voltage supply connection via the first current limitation element, the method comprising the step:

• transmitting the communication signal via the transmission unit.