For intrinsically safe instruments, is a safety barrier also required for 485 communication?
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For intrinsically safe instruments, is a safety barrier also required for 485 communication? If so, could you please tell me the model of a safety barrier designed specifically for communication purposes?
It seems that instruments with 485 communication functionality are not intrinsically safe? Haven’t encountered it yet.
The 485 communication safety barrier, also known as a digital communication safety barrier, is an isolated type of safety barrier used primarily for digital communication between a host computer and detection instruments or actuation units with communication interfaces in hazardous, explosion-proof environments. Safety barrier explosion-proof rating, half-duplex operation, adaptive baud rate, and also features repeater functionality – suitable for any hazardous environment.
In areas where intrinsically safe explosion protection is required, strictly speaking, all instrument circuits must be intrinsically safe circuits, and safety barriers need to be installed in these circuits.
Communication input type KTEXA—C711, single channel, RS485 input/1 RS485 output
Intrinsic safety: it must be present wherever there is electricity present in the area
This post was last edited by txcc1111 on 2015-6-19 17:46. I’m a bit confused regarding the communication side and the power supply side; could you tell me directly what type of side it is when the DCS cabinet sends signals to the PLC? Does using an intrinsically safe power supply mean that a safety barrier is no longer necessary? Is table jumping also caused by safety barrier interference?
This post was last edited by txcc1111 on 2015-6-19 21:21. Thank you; in other words, since there is an intrinsically safe power supply at the power supply end, a safety barrier is not necessary at the communication end. There’s no need to worry about 485 either – I am proficient in 485 communication programming, whether it comes to ASCII or RTU checksum calculations. What I don’t understand is explosion protection