Safety switching device and method for selecting an operating mode of a safety switching device
AssigneePilz GmbH & Co. KG
InventorJürgen Pullmann
Life of this patent
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Abstract
The invention relates to a safety switching device for connecting and reliably disconnecting an electrical load in response to a switching event from a safety transmitter. The safety switching device has at least a switching element and an operating mode selector unit for selecting an operating mode in response to a defined input signal. An input port is provided, which is connected to the operating mode selector unit such that the defined input signal can be supplied to the latter. The operating mode selector unit is designed such that it identifies the defined input signal as one from a group of different defined input signals. Responsive thereto, it selects an operating mode.
Claims17
In a machine installation, a safety switching device for connecting and reliably disconnecting an electrical load in response to a switching event of a safety transmitter, said safety switching device comprising:
- a first input port for receiving a first input signal provided from said safety transmitter in correspondence to said switching event;
- an evaluation and control unit for evaluating said first input signal, said evaluation and control unit being capable of operating in one of at least three different operating modes;
- an operating mode selector unit for selecting an operating mode from said at least three different operating modes;
- at least one output switching element controlled by said evaluation and control unit for connecting and reliably disconnecting said electrical load, said output switching element being controlled as a function of the operating mode selected;
- a second input port for receiving a selector input signal, said selector input port being coupled to said operating mode selector unit for supplying said selector input signal;
- a signal generator for generating a group of at least three different reference signals;
- and
- a plurality of output ports coupled to said signal generator for providing said group of reference signals at said output ports;
- wherein one of said output ports is coupled to said second input port;
- wherein said operating mode selector unit comprises a comparator for comparing said selector input signal received with said at least three different reference signals for identifying the selector input signal received as one from the group of reference signals;
- and
- wherein said operating mode selector unit is adapted to select one of said at least three predefined operating modes in response to said selector input signal identified.
A safety switching device for connecting and reliably disconnecting an electrical load in response to a switching event of a safety transmitter, said safety switching device comprising:
- at least one first input port for receiving a first input signal provided from said safety transmitter in correspondence to said switching event;
- an evaluation and control unit for evaluating said first input signal, said evaluation and control unit being capable of operating in one of at least three different predefined operating modes;
- at least one output switching element controlled by said evaluation and control unit for connecting and reliably disconnecting said electrical load;
- an operating mode selector unit for selecting an operating mode of said evaluation and control unit;
- and
- a second input port for receiving a selector input signal, said selector input port being coupled to said operating mode selector unit for supplying said selector input signal;
- wherein said operating mode selector unit is adapted to identify said selector input signal as one from a group of at least three different predefined selector input signals, and said operating mode selector unit being further adapted to select one of said at least three predefined operating modes in response to said selector input signal identified.
In a safety switching device for connecting and reliably disconnecting an electrical load in response to a switching event of a safety transmitter, said safety switching device being capable of operating in one of at least three different operating modes, a method for selecting an operating mode, said method comprising the steps of:
- providing a selector input signal at one input port;
- identifying said selector input signal as being one from a group of at least three different predefined input signals;
- and
- selecting one of said at least three operating modes in response to said selector input signal identified.
Dependencies are inferred from the claim text.