ABB M101, Руководство пользователя, Страница: 25 / 74

COMM UNICATION INTER FACE CO NNECTIO N SWITCHGEAR CONTRO L NETWORK
1TG C908004M0 201 17
5.2. Switchgear Control Network
MNS Digital Gateway can be connected to a standard 10/100/1000 Base-T Ethernet network
through LAN2 interface (Switchgear Control Network). Network components are standard
(COTS – commercial of the shelf) components but shall be of industrial grade design (e.g. no
office switches shall be used).
Examples of connections are shown in the following figures. All System configuration tools
(e.g. MNavigate) and system components (MNS Digital Edge Gateway, Time Server) are con-
nected to this network (see Figure 2). The cable shall be CAT5 / CAT6 depending on require-
ments based on the selected Ethernet communication speed. The connector type is standard
RJ45 type.
If the switchgear control network has any connection to other networks (e.g.
plant management network etc.) measures have to be taken to protect the
switchgear control network against unauthorized access (e.g. through Router
and Firewall). This is a project specific configuration. Contact always the local
network administrator and review the project specific requirements.
If managed switches or routers are used in the Ethernet network it has to be
taken care that sent ARP messages can pass through. Background: After
reboot, MNS Digital Gateway will send an ARP (Address Resolution Protocol)
message to force all connected Ethernet devices to update their internal ARP
table. This special ARP message is used to map the network layer address
(MAC address) to a dedicated link layer address (IP address). This ARP table
refresh is required to be able to establish an Ethernet communication.
5.2.1. Connection Examples of Switchgear Control Network
5.2.1.1. Option 1
If the MNS Digital Gateway is directly connected to MNS Digital Edge Gateway a cross-over
network cable is used.
On the MNS Digital Gateway, the cable has to be connected to the LAN2 Ethernet port, on
MNS Digital Edge Gateway the cable has to be connected to the designated Ethernet
connector. The cable type is CAT5 or higher.
Figure 11 MNS Digital Gateway directly Connected to MNS Digital Edge Gateway