STRIDE SE-MC2U-SC, Руководство пользователя

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VLAN Examples
Shown below are two examples of using VLANs and how they can solve common network
problems found in a factory automation facility. Note that the end devices used in these
examples do not recognize nor originate VLAN tags.
Problem #1: The process requires a PLC, Remote I/O, Frequency Drive control, HMI
access as well as a PC for Data Logging and a PC for configuration management. The
Remote I/O device and drive communicate via Multicast and Broadcast messaging which an
unmanaged switch cannot filter out. The PLC and the Remote I/O and Drive are remotely
located from each other. Running multiple Ethernet connections would be costly and
logistically complex so the customer wants to utilize existing wiring connections.
Switch 1
Remote
I / O
HMI
Switch 2 Switch 3
PLC/
PAC
Ether
Interface
1
Ether
Interface
2
Drive
Heavy Multicast
and Broadcast
Traffic
Configuration and/or diagnostic of all
switches can be accomplished for all
switches by plugging into Port 3 of
any of the switches by using the
management VLAN (VLAN1)
VLAN 1 = Management VLAN
VLAN 2 = PLC (Ethernet Interface 1), Office PC, HMI
VLAN 3 = PLC (Ethernet Interface 2), Remote I/O, Drive
Configuration
/ Diagnostic
PC for VLAN
Management
Office PC
for Data
Logging
E
E
E
T
N
T
E
N
E
N
T
N
E
T T
T
E
T
N
E
T
N E
T
Structured Wiring
Tag-based VLAN example
E
N
T
= Transparent Port
= Network Port (Trunk Port)
= Edge Port
Solution:
Use Stride managed switches, utilizing the VLAN feature to separate the broadcast
and multicast traffic from all the devices except for the PLC. We will also wire the three
switches into a Ring configuration so that we can take advantage of the redundancy feature
of the switch. In this situation, we need to use Tag-based VLANs since the Ethernet packets
will be traversing across multiple switches.
How to configure this setup:
We created 3 VLANs:
• VLAN 1 is the default VLAN and we leave it there and enable it on what we will call a
‘management port’ for each switch. In this way, we can plug our laptop into the management port
of any switch and be able to access the other switches across this VLAN to tweak the configuration
or view the diagnostics.
• VLAN 2 will contain one of the Ethernet interfaces of the PLC, the HMI and the Office PC.
• VLAN 3 will contain the other Ethernet interface of the PLC, the Remote I/O drop and the Drive.
4-46
Chapter 4 - Managed Switch Software Setup
Stride Industrial Ethernet Switches User Manual 2nd Ed. Rev. A