A functional safety switch output module with high diagnostic coverage
A switching output, functional safety technology, applied in simulators, program control, instruments, etc., can solve the problems of hindering the popularization and application of functional safety products, high product costs, and high design complexity, to improve diagnostic coverage, Reduce the difficulty of development and avoid the effect of communication
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[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0027] Such as figure 1 Shown is the block diagram of the module structure of the present invention.
[0028] A functional safety switching output module with high diagnostic coverage communicates with a safety controller through a PLC backplane bus interface to realize control of field devices. The switch output module is mainly composed of a microprocessor, a communication interface, an address detection unit, a switch output unit, a diagnosis unit, an external power monitoring unit, and an isolation circuit.
[0029] The communication interface adopts a redundant structure to communicate with the PLC controller through the PLC backplane bus; the address detection unit adopts a redundant structure and is responsible for detecting the address of the module; the switch output unit passes through the isolation unit before and after and the mic...
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