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PLC networks are often connected as subsystems to CIMS, large-scale
distributed systems, enterprise networks, or interconnected with
other PLCs.
The model structure of PLC equipment network is generally divided
into three layers, namely physical layer, data link layer, and
application layer. The network topology structure mainly includes
the following types;
Master slave bus type subnet: The higher the bottom layer of the
PLC network, the higher the real-time requirements. IC200ERM002
details that master-slave access control relies on the allocation
of bus usage rights by the host, which is simple and easy to
implement, and exhibits good real-time performance when there are
few slaves. Therefore, the remote I/O of PLC and the underlying
subnets, such as SINEC L1 and ORMON HOST Link networks, adopt a
master-slave access control method. They are based on
polling/answering, and the host sequentially polls the slaves to
see if they are using the bus. For urgent tasks, cooperate to
interrupt requests and insert them immediately. The host has
priority and requests to send data directly for broadcasting.
Distributed token bus type subnet: The intermediate layer of the
PLC network, such as Modbus, Modbus, OMRON's SYSMAC Link, etc.,
adopts a decentralized token bus access control method. This method
has no distinction between master and slave in each station on the
bus, with equal status. The allocation of bus usage rights is
distributed to each station and jointly adjudicated. Each station
on the bus forms a logical ring, where tokens flowing on the
logical ring distribute the bus, and the station that obtains the
token occupies the bus. ł
1.2 PLC Standard Generalization Protocol and Communication Protocol
PLC networks generally develop towards generalization and
standardization in the high-level configuration of the network,
usually using two configurations: MAP protocol or Ethernet
protocol. The standardization and interconnection of their
industrial LAN can be carried out and completed at the application
layer (high-level). Except for the high-level layer, most other
layers of the PLC network use their own protocols, and the physical
and data link layers of each protocol are not significantly
different, only at the application layer. Mainly manifested in the
inconsistent types, meanings, codes, frame formats, and mailbox
structures of command responses, making it impossible to
generalize. The interface provided by the protocol to the user is
relatively simple and clear. It is generally not difficult to
program and complete communication between PLC products of the same
protocol and series according to the instructions. However, it is
very difficult to complete communication between PLCs configured
with different protocols. Therefore, when designing PLC control
systems, PLC products of the same manufacturer and series are
generally selected to form a PLC network, and then managed to enter
the enterprise network or CIMS at the high-level. Using a personal
computer as the upper computer and several PLCs as the lower
computers to form a network has been widely used in practice.
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【Yaskawa】Servo Drive / Servo Motor
【Mitsubishi】Servo Drive / Servo Motor
【Honeywell】Module DCS / PLC
【Emerson】DeltaV Module / Servo Motor
【ABB】Input Output Module
【AB】Module / Touch Screen
【Rosemount】Pressure and Temperature Transmitter
【Yokogawa】Pressure Transmitter
【GE】IC69 Series PLC/ Fanuc Servo Motor and Drive
(Modicon,SMC,SICK,NORGREN,Siemens etc.)
Linture Technology Co,. Ltd
Contact person: Vivian
E-mail: linture0319@163.com
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