Regarding the wiring method of toxic flammable gas detectors
Thread Content
I would like to ask the experts: in a production environment where there are no major hazard sources, can toxic and flammable gas detectors be connected using a bus wiring method, when the signals from these detectors are fed into the SIS system?
A bus wiring method can be used. Bus technology supports the connection of various instruments and devices, enabling effective simplification of system wiring, reduction of maintenance efforts, and the implementation of remote monitoring and diagnostic functions, thereby improving production efficiency and safety. However, it is necessary to ensure that the selected bus protocol meets the requirements of the field environment and safety standards, such as using common industrial bus standards like Profibus and Modbus. At the same time, the reliability and redundancy of the bus system must be ensured to prevent single-point failures from affecting the operation of the entire system. .
Regarding this issue, the editorial board clearly stated during the presentation of 50493 that it is not recommended to use a bus-based approach. Document No. 116 issued by the State Administration of Work Safety classifies the GDS system as part of the safety instrumented systems, and the design specifications for such systems require that instrument signals should not be transmitted via buses. In safety inspections in many places, GDS is identified as a safety hazard due to its bus architecture and is required to be rectified.