Page 72 - 《橡塑技术与装备》英文版2026年3期

HINA R&P TECHNOLOGY AND EQUIPMENT

programmable logic chip to achieve intelligent routing of dual- computer control system was achieved through a layer
path data and discarding of redundant data packets. The CPU, 2 protocol, relying on the MAC address of the peer for
baseband chip, and FPGA of this terminal are all based on addressing. The native 5G network, on the other hand, relies on
domestic chip solutions. a layer 3 protocol for IP addressing, and the address obtained
by the 5G terminal is also an IP address, which does not
support layer 2 data forwarding. After the introduction of the
5G network, in order to ensure normal communication between
the PLC control system and the crane PLC, in addition to
introducing a 5G industrial terminal for 5G wireless signal
conversion, an AR router is added behind the crane PLC and
in front of the PLC control system as shown in figure 6. The
sending AR router is responsible for packaging the softGRE
tunnel, encapsulating the industrial layer 2 protocol within
the softGRE tunnel, and then communicating with the peer
AR. The receiving AR router is then responsible for removing
Figure 5 Schematic diagram of the dual-path terminal for the tunnel and converting it into an industrial protocol before
the New Universal 5G network sending it to the crane PLC or PLC control system. At the same
time, the 5G network assigns an IP address to the 5G industrial
4.3 5G Local Area Network (LAN) terminal. This approach is equivalent to establishing a two-
Many industrial equipment communication protocols layer network, with the upper layer being the enterprise private
predominantly utilize the layer 2 Ethernet protocol. Compared network, communicating through the softGRE tunnel, and the
to the layer 3 IP protocol, the advantage of the Ethernet lower layer being the 5G network, serving as the bearer layer.
protocol lies in its avoidance of complex routing calculations, This networking method is relatively complex and slightly
resulting in higher communication efficiency and lower more expensive.
latency. Furthermore, the layer 2 protocol is also more secure,
as it can achieve physical and logical isolation through VLAN
technology, effectively preventing interference and attacks
between different networks. Therefore, in the field of industrial
Ethernet, some protocols do not define the network layer and
transport layer, and these protocols are commonly referred
to as "bare" Ethernet protocols, as they only define the data Figure 6 Traditional 5G industrial terminals require AR
link layer (layer 2) and physical layer. These protocols are routers to achieve layer 2 networking
typically used in real-time communication and industrial
With technological advancements, once the network
control systems, as they provide lower communication
supports 5G LAN technology, layer 2 protocols can be directly
latency and greater bandwidth. Some typical "bare" Ethernet
protocols include Profinet, EtherCAT, and Modbus TCP. transmitted within the 5G network, as illustrated in figure 7.
There is no longer a need to insert an AR router to establish
Additionally, there are many multicast/broadcast services in
a new tunnel between the PLC control system and the crane
industrial scenarios, which can achieve distributed control and
management, thereby improving production efficiency and PLC. Additionally, 5G industrial terminals no longer require
IP addresses allocated by the 5G network. In this approach,
quality.
the entire network constitutes a single-layer network. The 5G
Taking crane control as an example, originally,
core network autonomously learns the MAC address list of
communication between the crane PLC and the PLC host

·26· Vol.52，No.3