0
Both Profibus(PA) and FF H1 started off in the same working group and have much in common: the physical medium on which both operates is in accordance to IEC 1152-2 intrinsically saftey. Profibus DP which is used in 90% of profibus applications use either RS-485 or an Optical fibre link. When comparing thir implementation on the data layer in Profibus the input and output blocks are located in the controller itself. The controller(master) fetches the data from the field instruments. However no control blocks are moved into instruments. In FF, the input blocks along with the control block are moved into instruments consequently implementing 'control in the field'. The number of devices per segment/loop also varies in Profibus VS FF H1, with the later having a max of 127 and being limited to 32 due to bottleneck of RS-485 and FF to 31 itself. But practically FF system recommends no more than 12 devices per loop with a cycle time of 0.5s while profibus supports 24 with a delay of 400ms.
Add your answer:
Earn +20 pts
What is difference between profibus dp and profibus pa?
First I think I should point out that Profibus-PA instruments do not use RS-485 (such as is used by Profibus-DP), but a MBP (Manchester Coded, Bus Powered) physical layer, as described in the IEC 61158-2 standard. This is why you need a bus coupler to 'translate' the signals from Profibus-DP to Profibus-PA, and to power the PA bus. The maximum transmission rate of Profibus DP network 12Mbps The maximum transmission rate of Profibus PA network 45.45Kbps You need to power the DP instruments, while PA instruments get its power and exchange data via the same PA cable . You need DP/PA link or DP/PA coupler to link DP network with PA . when you use a coupler connected directly to the DP network , then your DP network transmission rate would be decreased to 45.45. From Pradip
How does a isometric drawing paper looks like?
Isometric drawing paper either has dots on it with very minimal distance in between them, or has very small triangles or diamond shape with no distance in between them. It is available in different sizes and varieties.
Difference between coordination and cooperation?
CO-OPERATION:Working together towards the same end.CO-ORDINATION:Bring the different elements of some thing together so that itworks well.
What is the difference between chiller and freezer in industrial equipment division?
chiller and freezer is same, tem is different, require tem for chiller is 0-5*C, & freezer is tem should be -18*c & above
What is logistics crossdocking?
Cross-docking is a practice in logistics of unloading materials from an incoming semi-trailer truck or rail car and loading these materials directly into outbound trucks, trailers, or rail cars, with little or no storage in between. This may be done to change type of conveyance, to sort material intended for different destinations, or to combine material from different origins into transport vehicles (or containers) with the same, or similar destination.
What is difference between profibus dp and profibus pa?
First I think I should point out that Profibus-PA instruments do not use RS-485 (such as is used by Profibus-DP), but a MBP (Manchester Coded, Bus Powered) physical layer, as described in the IEC 61158-2 standard. This is why you need a bus coupler to 'translate' the signals from Profibus-DP to Profibus-PA, and to power the PA bus. The maximum transmission rate of Profibus DP network 12Mbps The maximum transmission rate of Profibus PA network 45.45Kbps You need to power the DP instruments, while PA instruments get its power and exchange data via the same PA cable . You need DP/PA link or DP/PA coupler to link DP network with PA . when you use a coupler connected directly to the DP network , then your DP network transmission rate would be decreased to 45.45. From Pradip
Difference between smart and hart transmitter?
They are the same thing. A smart transmitter can be Hart, Fieldbus and in the case of Foxboro instruments FoxCom.
What is profibus communicatio protocol?
Profibus is a field bus standard that contains a set of protocols (located in three levels of the OSI model) that make possible communication between PLCs and distributed I/O modules, HMIs, drives, et cetera. It was developed in the late 80s by several companies (including Siemens).
What are the different between communication and relationship?
Communication is the foundation of culture while the relationship explains how people are connected.
Differentiate between shallow and deep foundation?
The difference between a shallow and deep foundation is very simple. A shallow foundation is not very deep and a deep foundation is.
What services does the Coexist Foundation provide?
The Coexist Foundation is a non-profit organization was designed to promote a better understanding between different religious groups through educational and research projects.
What is the difference between a raft foundation and a mat foundation?
They r the same. There is no difference.
What is the difference between a strip and a pad foundation?
gay
What is the difference between regular foundation and mineral foundation?
One of the difference is that mineral foundation is more expensive But on the positive side you will find that mineral foundation is more Water Resistant and it offers a Natural UV protection
Comparison between shallow foundation and deep foundation?
A shallow foundation is generally considered any foundation element that is 6 feet or less in depth. or the depth of foundation is equals to its width of the foundation. Examples are thickened edge slabs and grade beams that are supporting minimal weight.
What does daltons fourth postulate state?
Dalton's fourth postulate states that atoms of different elements have different weights. This idea laid the foundation for the concept of atomic mass and helped to distinguish between different elements based on their atomic weights.
What is the difference between charity and foundation?
Charities are organizations set up to aid those in need. Foundations might be considered as organizations that engage in funding different organizations such as charities.
