[Daily Question 20090413] Discuss the communication bus between the controller and the IO module

The communication bus between Siemens controller and IO card is PROFIBUS bus, which adopts redundant configuration.

The communication between Siemens controller and IO card can also be PROFINET

Hollysys MACSV DP bus~~~ uses Siemens DP repeater... Our factory also has a Siemens system that also uses DP bus·~·

1. Yokogawa CS3000. A dedicated VNET/IP is used between the CPU of CS3000 and the IO station. The speed is 10M. It is considered a quasi-real-time Ethernet. The communication medium can use twisted pairs. Long distances can be extended using optical fiber. 2. Industrial Ethernet is used between Xinhua XDPS-400E, DPU station and IO station. The early one was the Bitbus bus. The speed is 10M, and the communication medium is twisted pair. Industrial Ethernet communication between personal controllers and IO stations will become the mainstream of DCS in the future. 3. Siemens PCS7, 400. Profibus DP is used between the CPU station and the IO station. The communication medium is mainly DP cable, optional photoelectric converter, converted to optical fiber, speed and distance, media related. 9.6-12M。 However, speeds below 187.5K are almost unusable. The general minimum requirement is more than 500K. The DP between the redundant controller and the IO station is also redundant. 4. The communication between ABB AC800F and AC800F controller and S800 IO station can only be Profibus DP. Basically the same situation as Siemens. But please note that Siemens’ DP redundancy mechanism is SR. The current version is SR v1.3. ABB's DP redundancy mechanism is FR. In other words, it is unrealistic to connect the Siemens redundant controller to the ABB s800 IO station, or the ABB AC800F redundant DP controller, or to connect the ET200M of the Siemens redundant DP interface. At the same time, the DP redundancy of AC800F has nothing to do with the CPU redundancy. The CPU runs on a standalone machine, and the DP can be redundant or not. ； The CPU operates redundantly, and the DP can be redundant or not. Siemens's is very different. If the CPU is single, the DP can only be non-redundant. If the CPU is redundant, the DP must be redundant. In addition, please note that SOE cannot be done on the S800 IO station of AC800F, that is, SOE modules such as DI830 cannot be plugged into the s800. If AC800F wants to achieve SOE. Can pass CAN bus. ac800f uses CAN bus to connect to the previous generation IO of AC800F through FI810F. --Freelance2000 series of rack-mounted IO. Although this method can connect other IO, such as AI, DI, DO, AO, etc., this method is mainly used to connect SOE modules. Not used to connect to regular IO. ABB ac800m AC800M can connect to the IO station through the Modulebus bus. If it is a redundant system. You can use Modulebus optical fiber to connect to the IO station. The interface module is TB840. IO is still from S800 series. Can support AI, AO, DI, DO, PI, SOE. wait. However, ModuleBus's optical fiber slave station can only be up to 200 meters away. There is a maximum of 7 stations. Maximum 12 IO per station. Of course, AC800M can still connect to the IO station through Profibus DP. AC800M connects to the IO station through the Profibus DP bus, which is basically the same as AC800F. The only difference may be that the current CI854A has a default redundant dual DP interface, while the FI830F of the AC800F has a single DP and needs to be added with RLM01 to convert it to a dual DP interface. 5. Hollysys FM. FM connects FM series IO through Profibus DP. The DP bus is single DP. The speed is programmed hard, it is 500K. If the distance is not long enough, you can generally add a repeater or photoelectric conversion. Hollysys SM. SM is also connected to the SM series cage IO stations through Profibus DP. DP cable is dual DP. The rate is still fixed at 500K. However, it should be noted that SM's DP redundancy is only the redundancy of DP cables, not DP redundancy in the complete sense. That is, it is neither an SR Dp redundancy mechanism nor an FR Dp redundancy mechanism. As an ordinary user, you may not need to know too many technical details. As long as everyone knows that if it is redundant DP, then neither the ET200 station with Siemens redundant DP interface nor the S800 station with ABB redundant interface can be installed under the SM. 6.Honeywell HW TPS is not clear. HW PKS C200. There are 2 types of IO buses. PKS C200 can be connected to the IO station through the ControlNet IO bus. The A series IO station is AB's 1756 series, and the B series IO station should be AB's 1794 series. There are many bugs when using the ControlNet Io bus to connect to the IO station. For example, the number of IO modules cannot be too many. Not even too few, less than 2 IO stations, it will cause major problems when the CPU performs redundancy switching. At the same time, currently, all series of AB's IO cannot achieve IO redundancy. And support for Hart was poor. Therefore, when using PKS C200 for projects, the best choice is PM series IO. C200 can be connected to PM series IO stations through the IO Link bus. PM series can support Io redundancy. The quality is also excellent. 20 years of good reputation! Support for hart is also in place. G3 certified models are also available. HW PKS C300. IO bus or IO Link. It can be connected to the latest C series IO, and of course still supports the old classic PM series IO. C300 is connected to the PM series IO station through the IO Link bus, and has recently won several projects. This post was last edited by qiaopeng1231 on 2009-4-13 22:23 ]

A. AB ControLogix 5000 Logix 5000 redundant system connects IO stations through COtrolnet. The communication medium is mainly RG-6 coaxial cable. The speed is good, up to 5M. It can reach 1KM without adding relays, and can add 5 relays. Not bad either. Optional photoelectric converter to accommodate longer distances. The CNET interface communication cable can be configured singly or redundantly. However, CNET's redundancy is a dual-cable interface on a single module, which is different from Siemens and ABB's interface modules in terms of redundancy. The characteristics of Controlnet Io are the same as those of Honeywell mentioned above, or conversely, Honeywell completely adopts AB's IO bus and IO modules. So what are the advantages of AB, what are the advantages of HW, what are the disadvantages of AB, and what disadvantages does HW inherit. Of course, there are still slight differences in the specific implementation. Of course HW did better than AB! If you are interested, please discuss how HW can make up for the bugs of AB while using AB technology. B. Schneider Quantum The Quantum series redundant system communicates through the S908 IO bus IO station. The Remote IO bus speed of S908 can reach 1.5M. It's also quite high enough. The communication media can be Rg-6, RG-11. Coaxial cable. RG-6 can reach 1.4KM without relay. RG-11 can reach more than 4.5KM without relay. The communication cable of RG-6 is the same as that of AB. Photoelectric converter can be added. The cable interfaces on the S908 communication module are either single or redundant. Basically the same style as AB. The biggest problem with S908 right now is that it is not open. Basically, it can only be connected to Quantum series IO stations. S908 is Schneider’s closed standard. It is not as open as profibus DP and ControlNet. C. GE S90-70, PAC RX7i 90-70 and PAC7 redundant systems communicate with Io stations through GE's patented Genius bus. The communication medium is shielded twisted pair. The speed is 153K. The distance indicator was forgotten. Haven't used it since 2005. The communication medium can be configured singly or redundantly. The Io site is very flexible. You can choose the cheap and cost-effective Versamax series with good quality. You can also choose the FileContrl series IO (although not popular). Of course, you can also connect the S90-30 series and S90-70 IO, but it is rare to see anyone doing this. . . If you do SIS-ESD, you can also connect the Genesis series IO. --Of course, if you have more money, if you don't do ESD, you can build a redundant PLC system, which can still be connected to the Genesis series IO. The Genius bus is still not open. closed. Basically only GE is playing. D. Mitsubishi QnPRH. Xiao Q's redundant series QnPRH connects IO stations through Mitsubishi's patented Melsecnet IO bus. Melsecnet is relatively not very open. Only Japan's Yamatake family is cheering globally. When MelsecNet uses RG-6 coaxial cable media, the speed is 10M and the communication distance is 500 meters in a single segment, which can be extended by adding relays. Melsecnet uses optical fiber communication media with a speed of 25M. The communication distance depends on the characteristics of the optical fiber medium, single-mode 20KM, multi-mode 2KM. Melsecnet's communication cables can also be configured redundantly. Io station is mainly Q series. All I can say is that the price/performance ratio is okay. It's just that the controller head is a bit expensive and doesn't quite match the cheap Japanese ones.

Please add the situation of Invensys-Foxboro. In the case of Invensys-eurotherm, there are also the Io buses of Zhejiang University Central Control, Hitachi Heavy Industries, Mitsubishi Heavy Industries, Emerson Ovation, and DeltaV. Others such as Metso MAXDNA, ABB-Bailey Symphony, etc. Please also work hard to add. . .

Siemens PCS7 system, CPU417-4H controller, IO module communicate through ET200M, using Profibus bus between them； Hollysys SmartPro system, the communication bus between CPU and IO module is Profibus bus.