Device for intrinsically safe redundant current supply of field devices
View Patent ↗A device is provided for intrinsically safe redundant current supply of field devices with a common current-limiting resistor in the mesh of the field device and with redundant current supply units. A current sensor can be provided in the mesh of the field device, the output signal of which sensor is connected to a controllable voltage source in the redundant current supply units.
1. A device for intrinsically safe redundant current supply of a field device, the device comprising:
a common current-limiting resistor in a mesh of the field device;
redundant current supply units; and
a current sensor, provided in the mesh of the field device,
wherein an output signal of the current sensor is connected to a controllable voltage source in the redundant current supply units.
2. The device of claim 1 , wherein the current sensor is configured in analog input assemblies to acquire a measured value transferred by the field device as imprinted current.
3. The device of claim 1 , wherein the current sensor includes a diode in a forward direction.
4. The device of claim 1 , wherein the current sensor includes a resistor.
5. The device of claim 2 , wherein the current sensor includes a diode in a forward direction.
6. The device of claim 1 , wherein the current sensor is a diode in a forward direction.
7. The device of claim 2 , wherein the current sensor includes a resistor.
8. The device of claim 1 , wherein the current sensor is a resistor.