ESD--Is there a point where the signal enters DSC and ESD at the same time?
Thread Content
This post was last edited by Hardman on 2010-6-9 08:46 Is there a point where the signal enters DSC and ESD at the same time? If so, how is it implemented? (For example, if a two-out-of-three flow meter enters both DSC and ESD, how can it be connected if each meter only has two wires? )
AI can exit the safety barrier with one input
If this point is only displayed in DCS and does not participate in control, it can also be communicated to DCS through ESD.
Another way is to advance the DCS and then connect it to the ESD through the AO output.
Using a signal splitter allows simultaneous access to DCS and ESD
Reply to 4# Dameng Xianjue In this case, it is better to use a signal distributor or a safety barrier with one input and two outputs. It also depends on the function of the signal. If the ESD is involved in logic but the DCS is only displaying, you can enter the ESD and then communicate to the DCS.
Reply 6# Senior Engineer understands, thank you. I also want to ask, does the DSC controller generally communicate with the ESD controller?
Why do you all talk about ESD control? DCS shows that it is carried out through communication.； Does it mean that communication cannot be controlled?
Using communication control, especially in important occasions such as ESD, the current on-site use effect is not very reliable.
Reply 8# industrial control apprentice, it’s best not to use communication control, which is much less reliable than hard wiring.
Many users require ESD data to be displayed on the DCS. Because ESD usually has almost no operations, there is no need to assign dedicated personnel to operate it.