Contemporary Controls Metasys JC-MER-CXB, Руководство пользователя, Страница: 16 / 58

TD060100-0MA
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3. Use of a customer’s Wide Area Network (WAN) is not
recommended. The delays associated with Wide Area Networks
may be unacceptable for operation of the Metasys Network.
4. If the system contains a JC/85 Gateway, the Gateway points should
not be mapped to objects that reside in NCMs located on different
subnets.
The JC/85 Gateway obtains the status for all objects that are
defined in the Gateway at frequent intervals (every 1-5 seconds).
This creates a large amount of message traffic on the N1
network. If this message traffic is routed across the Ethernet, it
will (a) add excessive loading to the customer’s Ethernet
network, (b) slow down the operation of the JC/85 Gateway, and
(c) result in sporadic offline reports for objects located in the
remote NCMs.
5. For the same reasons, if the system contains a Network Port, the
Network Port cannot map its analog data points to objects that
reside in NCMs located on different subnets.
6. As with all Metasys networks,
each
NCM and
PCI/OWS
in the
network must use a common time zone, even if the devices
physically reside in different time zones.
Network Management Staff Involvement
When installing the
JC-MER-CXB
, work closely with the network
management staff at the job site. They will know the intricacies of
the Ethernet network to which you will be connecting. Get them
involved as much as possible. They should be able to
provide you
with the following:
•
Ethernet connections
•
assignment of IP addresses
•
debugging expertise during installation and commissioning
of
the JC-MER-CXB
Metasys May Be Affected
Realize that the Ethernet network will affect the Metasys N1
Network. It can do so in these ways:
•
Ethernet traffic may slow down the performance of the Metasys
N1 Network.