N1 Communications Are Occasionally Unreliable; Data Cannot Be Viewed On Ows Across Network - Contemporary Controls Metasys JC-MER-CXB User Manual

N1 Communications Are Occasionally Unreliable

1. Ethernet communications may be unreliable. Use ipstat or ping
to check for Ethernet errors. If transmit or receive errors are
indicated, check with the network administrator for the Ethernet
network to determine if they have been experiencing Ethernet
downtime or excessively heavy network traffic.
2. ARCNET communications may be unreliable. Check the
ARCNET cables for any subnets that are experiencing problems.
3. Metasys N1 communications may be timing out. If you have
eliminated the other possible causes of this problem, contact
Field Support Services for assistance.

Data Cannot Be Viewed on OWS Across Network

The Metasys Operator Workstation (OWS) can be improperly config-
ured so that it transmits broadcast ARCNET messages, but not point-
to-point ARCNET messages. The symptoms are as follows:
•
No nodes come online at the OWS.
•
The OWS cannot open any focus windows that require data
from a remote node.
•
The OWS is online to the rest of the system, but cannot access
any data over the network.
The JC-MER-CXB statistic screen shows broadcast traffic
•
from the OWS but not any normal message traffic.
•
Other nodes may transmit Retry messages to the OWS.
These problems are caused by an IRQ conflict at the OWS. The
normal IRQ setting for the ARCNET card is 7. Some system BIOSes
will conflict with this setting. To resolve the conflict, change the
ARCNET IRQ to a different IRQ setting that is not currently in use.
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