Do the measurement data from the SIS system need to be transmitted to the DCS?
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This post was last edited by liu530014416 on 2023-7-29 21:55. Dear teachers, is it necessary for the measurement data from the SIS system to be transmitted to the DCS? For example, data such as liquid level, pressure, and solenoid valve status, so that DCS operators can see them? From a process perspective, this data is highly necessary for operators; it can be compared with DCS data. Are there any regulations that prevent SIS data from being communicated to the DCS? Or what standards require that SIS data be communicated to the DCS? In the Notice from the Jiangsu Provincial Emergency Management Department on the Issuance of the \"Guidelines for the Inspection and Evaluation of Safety Instrumented Systems in Hazardous Chemical Enterprises (Trial)\\", under 4.1.8 Human-Machine Interface, point 5 states that, apart from basic process control systems, no communication interfaces should be established between the SIS and other systems ； Except for bypass signals and reset signals, a basic process control system should not use communication to send commands to a safety instrumented system. That is, communication with DCS is allowed. ” Except for bypass signals and reset signals, a basic process control system should not use communication to send commands to a safety instrumented system. ”Does this sentence mean that the DCS can only send bypass signals and reset signals? Can’t send a read data command? For example, when using Modbus communication, can the DCS only act as a slave station? For example, if a Modbus slave detects an error and reports abnormal information to the master station, does this constitute a violation of the requirement to \"send commands to the safety instrumented system\"?
According to the provisions in the \"Guidelines for the Inspection and Evaluation of Safety Instrumented Systems in Hazardous Chemical Enterprises (Trial)\」issued by the Jiangsu Provincial Emergency Management Department, no communication interfaces should be established between the SIS system and other systems, but communication with the DCS is permitted. This means that the measurement data from the SIS system can be transmitted to the DCS via communication; data such as level, pressure, and solenoid valve status can be viewed and compared by DCS operators. It should be noted, however, that apart from the bypass signal and reset signal, a basic process control system should not send commands to the safety instrumented system. .
What if a dual-prevention mechanism or a provincial emergency response platform needs to collect data from the SIS?
It’s a bit difficult to answer your question, but you just need to understand that experts are the spokespersons for **. And then, there was no then: lol
It’s optional; it depends entirely on the needs. If you want complete independence, then there’s no need to communicate with the DCS. If the security level is sufficient and you want to save money, communication with the DCS is possible
If there is no separate SIS operation station, communication with the DCS is still required; it are still the process variables that enter the SIS system, and the operation team needs to monitor their values and status.
DCS can read SIS data via communication; it can only view the data, not manipulate it. Of course, DCS can also read SIS data without communication, depending on the requirements. Furthermore, combustible and toxic GDS systems cannot collect data from sensors at the field via a 485 interface or other bus types.
In the Notice from the Jiangsu Provincial Emergency Management Department on the Issuance of the \"Guidelines for the Inspection and Evaluation of Safety Instrumented Systems in Hazardous Chemical Enterprises (Trial)\\", under 4.1.8 Human-Machine Interface, point 5 states that, apart from basic process control systems, no communication interfaces should be established between the SIS and other systems； Except for bypass signals and reset signals, a basic process control system should not use communication to send commands to a safety instrumented system. That is, communication with DCS is allowed. ”——————There’s no rule here stating that DCS is not allowed to read SIS
Sending a read command – isn’t that considered a command?
First, communicate with the DCS to create the module; the platform retrieves data from the DCS, and a network gateway needs to be installed
The data from SIS needs to be transmitted to the DCS, so that it can be displayed and used for generating alarms in the DCS, thereby overcoming the limitation of having few SIS operation stations. Additionally, general process data, including that from DCS, SIS, GDS, and PLCs, is transmitted via the DCS to the enterprise network’s real-time database, allowing for a wider range of applications such as SMS notifications and production scheduling reports.