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 PM783F
Display operation panel PM665 3BDS005799R1
Display operation panel PM665 3BDS005799R1
Display operation panel PM665 3BDS005799R1
Display operation panel PM645B
Display operation panel PM645B
Display operation panel PM640
Display operation panel PM633
Display operation panel PM633
Display operation panel PM633
Display operation panel PM632
Display operation panel PM632
Display operation panel PM630
Display operation panel PM630
Display operation panel PM591-ETH
Display operation panel PM581 1SAP140500R3160
Display operation panel PM581
Display operation panel PM573-ETH
Display operation panel PM511V6
Display operation panel PM511V16/3BSE011181R1
Display operation panel PM511V16 3BSE011181R1
Display operation panel PM511V16 3BSE011181R1
Display operation panel PM511V16
Display operation panel PM511V16
Display operation panel PM511V16
Display operation panel PM511V08 3BSE011180R1
Display operation panel PM511V08 3BSE011180R1
Display operation panel PM511V08
Display operation panel PM510V16 3BSE008358R1
Display operation panel PM510V16
Display operation panel PM510V16
Display operation panel PM510V16
Display operation panel PM510V08
Display operation panel PM210
Display operation panel PM152 3BSE003643R1
Display operation panel PM150V08 3BSE009598R1
Display operation panel PM150V08 3BSE009598R1
Display operation panel PL810
Display operation panel PKSF102
Display operation panel PIO800K02
Display operation panel PIB671-150
Display operation panel PHKRMPBA2000A
Display operation panel P-HC-PLT-20221100
Display operation panel P-HC-PLT-10111100
Display operation panel P-HC-DOC-22021000
Display operation panel P-HC-DOC-22011000
Display operation panel P-HC-DOC-11011000
Display operation panel P-HC-DOC-0001000
Display operation panel P-HC-DOC-00001000
Display operation panel PHCBRCPBA20000
Display operation panel PHCBRCPBA20000
Display operation panel PHCBRCPBA10000
Display operation panel P-HC-BRC-40000000
Display operation panel PHCBRC40000000
Display operation panel PHCBRC300P-HC-BRC-300
Display operation panel P-HC-BRC-30000000
Display operation panel PHCBRC30000000
Display operation panel P-HC-BRC-10000000
Display operation panel P-HC-BRC-10000000
Display operation panel PHBSIM10010000
Display operation panel PHBSIM1000C100
Display operation panel P-HB-RMU-8000N200
Display operation panel P-HB-RMU-11010000
Reviews
There are no reviews yet.