Description
5 Fieldbus network layer
5.1 mfb (master field bus) bus
The mfb bus is a field LAN bus and is connected between mp200, mp90, s400i/o, OPC (small control station) and the transmission system. The mfb communication bus uses coaxial cables and twisted pairs. It connects the ci520/ci525/ci526 communication interface module and the dstc452 modem. The ends of each twisted pair must be isolated, and the shielding layer of one end must be grounded. The communication of mfb The rate is 375kb/s, its resistance is 75 ohms, and its hardware configuration is shown in Figure 3. The relevant system information of mfb is obtained from the engineering station. The general order is time, information model, code, task number, sequence number, and data. It mainly displays the following states.
Code 20: cpu communication interface contact lost
Code 21: fatal hardware failure
Code 39: device/staTIon ok
Code 72: device/statIon address ok
Code 120: Process failure
Code-1: Execution error
Code -4: System error
Code -5: Minor system site error
Code-6: Communication failure
Code-9: Catastrophic bus failure
Code -10: Redundant cable interrupted
5.2 af100 (advant field)/mb90 (master bus) bus
The purpose of AF100/MB90 is to provide communication between multiple APC sites or between APC sites and ABB industrial system equipment. MB90 supports two different types of communication, data processing and information sending. The data set is dynamic data. Use To monitor and control a certain processing process, this process uses service information for parameterization, program installation, and diagnosis. AF100/MB90 is a high-performance regional bus capable of connecting up to 79 APC sites. The mb90 has a maximum length of 300 meters, and if equipped with appropriate signal cables and signal repeaters, and long-distance configurations between individual transmission devices are available, up to 2000 meters. Technical characteristics of the bus
(1) Communication rate 1.5mbit/s
(2) Attenuation bus length <300m, proliferation delay <2000m
(3) Telegram length 2, 4, 6, 8,…32 bytes of user data.
(4) Identification code (telegraph code) range 1…4000
(5) Cycle time 2, 4, 8, 16, 32, 64, 128…2048 or 4096ms
af100/mb90 relies on a centralized bus manager. The bus manager functions are relatively complex and have many requirements. For example, apc sites cannot be used as bus managers because they do not contain bus manager functions. To make communication between APCs via AF100/MB90 possible, each solution (standalone and embedded) can be used to arrange the bus master of AF100/MB90. When the APCs start executing their applications, the bus master must be operable, otherwise the data set function block within the apc branch will enter an error state when the locally configured data set is not acknowledged by the bus manager within the specified time limit. , if the system has only apc site and no masterpiece is connected to mb90 or ac450 and af100, an independent bus manager should be installed.
The communication between ABB DCS and the transmission system (such as acv700/dcv700) is realized by relying on the drrtra (drive trans mi t) element and drrec (drive reciver) element shown in Figure 4 .
The drrtra (drive transmit) element is used to pass a given data set to the abb drive controller and select the control word and command word signal of the drive signal. The definition of the control word and command word signal is given in the application drive software description. The drrtr element can generate different types of periodic messages supported by the drive communication protocol. The destination of the signal is selected by the drive signal. The drrtr element can also write parameters. In the normal phase, the overload of drrtr can be detected.
The drrec (drive reciver) element is used to receive signals and control word values from the abb drive controller. The definitions of these signals are given in the application drive software description. The drrec element is just periodic information supported by the drive connection protocol. The receiving data source is selected by determining the drive signal and signal index through the element input parameters. The drrec element also has access to parameters, and overloads of drrec can be detected during configuration.
Display operation panel 3BHE004573R0142 UFC760BE142
Display operation panel 3BHE004573R0142
Display operation panel 3BHE004573R0141
Display operation panel 3BHE004573R0141
Display operation panel 3BHE004385R0001 UNS0884A-V1
Display operation panel 3BHE003604R0102 UFC765AE102
Display operation panel 3BHE003604R0102 UFC765AE102
Display operation panel 3bhe003604r0102
Display operation panel 3BHB045668R0008
Display operation panel 3BHB045668R0008
Display operation panel 3BHB045647R0003
Display operation panel 3BHB045647R0003
Display operation panel 3BHB045647R0001
Display operation panel 3BHB045647R0001
Display operation panel 3BHB035822R0001
Display operation panel 3BHB032608R0001
Display operation panel 3BHB031013R0001
Display operation panel 3BHB030479R0512
Display operation panel 3BHB030310R0001
Display operation panel 3BHB022755R0001
Display operation panel 3BHB021400R0002 5SHY4045L0004
Display operation panel 3BHB021400R0002
Display operation panel 3BHB020538R0001
Display operation panel 3BHB019719R0101
Display operation panel 3BHB018162R0001 5SHY4045L0001
Display operation panel 3BHB017688R0001 IPS21-35AD
Display operation panel 3BHB017688R0001
Display operation panel 3BHB017641R0001
Display operation panel 3BHB016371R0002
Display operation panel 3BHB016295R0001
Display operation panel 3BHB015651P0001
Display operation panel 3BHB013088R0001
Display operation panel 3BHB013088R0001
Display operation panel 3BHB013085R0001
Display operation panel 3BHB012961R00015SGX2645L0002
Display operation panel 3BHB010740R0001
Display operation panel 3BHB010662R0250
Display operation panel 3BHB010088R0001
Display operation panel 3BHB010088R0001
Display operation panel 3BHB007445P0001 POS.A6033
Display operation panel 3BHB007211R0115
Display operation panel 3BHB007209R0105
Display operation panel 3BHB006715R0277 SYN5202-0277
Display operation panel 3BHB006309R0001
Display operation panel 3BHB005243R0106 KUC755AE106
Display operation panel 3BHB005243R0105
Display operation panel 3BHB005171R0101
Display operation panel 3BHB005171R0101
Display operation panel 3BHB004661R0101 KUC711AE101
Display operation panel 3BHB004661R0101
Display operation panel 3BHB003689
Display operation panel 3BHB003688R0101
Display operation panel 3BHB003688R0101
Display operation panel 3BHB003688R0001
Display operation panel 3BHB003688R0001
Display operation panel 3BHB003431R0101
Display operation panel 3BHB003431R0001
Display operation panel 3BHB003387R0101
Display operation panel 3BHB003149P104
Display operation panel 3BHB003041R0101
Display operation panel 3BHB002953R0108
Display operation panel 3BHB002751R0106
Display operation panel 3BHB002751R0102
Display operation panel 3BHB001869R0100
Display operation panel 3BHB000652R0001
Display operation panel 3BHB000582P201
Display operation panel 3BHB000272R0101
Display operation panel 3BHB000272R0001
Display operation panel 3BDM000201R1
Display operation panel 3BDH000741R1 CTI 21-P Ex
Display operation panel 3BDH000741R1
Display operation panel 3BDH000741R1
Display operation panel 3BDH000690R1
Display operation panel 3BDH000530R1
Display operation panel 3BDH000365R0001
Display operation panel 3BDH000364R0002
Display operation panel 3BDH000032R1
Display operation panel 3BDH000022R1
Display operation panel 3AUA0000110429
Reviews
There are no reviews yet.