MM-IM User Guide
56
Dynamic Configuration and Reporting
Some configurable values are able to be dynamically controlled, affecting the behaviour of
the MM-IM without needing to download a different configuration. Operational status of
the MM-IM can be reported in a similar manner for specific values. This section details
which configuration items can be dynamically controlled, which report status, and how to
achieve this.
General
The dynamic configuration and reporting requires that each value is mapped to a
specifically named Straton point. These values are able to be used as any other point in
Straton, allowing the user programme to locally update its configuration during execution.
The name of the point is used to map to the configuration or reporting data within the
MM-IM.
The master can set the configuration and read reported values as it can for any point.
Dialout Test
The MM-IM is capable of supporting primary and redundant communications media, each
with multiple outgoing addresses. When an alarm is generated, the MM-IM attempts to
connect to the master to report the alarm using the configured dialout communications
details. If an attempted connection fails to reach the master it will try the other
connections until one is successful. When the primary media has a failure, there is the
possibility that the redundant media is also in a failed state.
The dialout test functionality enables each configured connection to be tested to
determine whether its media is available or failed. This is performed proactively to allow
for example the failure of the redundant communications media to be reported while the
primary is available.
The High Dialout Failure (HDF) status bit reports whether either communications media
has failed with 10 successive failures to contact the master. This will only be reported
when there is communications with the outstation, and thus it indicates failure of the
other media. To determine which media has failed, the successful connection is reported
by the outstation dynamically.
Dialout Test Frequency
The frequency of each test dialout connection from the MM-IM to the master can be
independently configured. This allows each connection to be tested at a suitable rate. The
testing relies on the MM-IM needing to dialout to the master (it is irrelevant for an
outstation that is only ever contacted by the master). The values relate to the interval at
which each particular connection is tested, based on the number of attempted
connections. Thus a test frequency of 5 will ensure the connection is tested every sixth
dialout.
As each dialout connection maintains its test record independently, each has its own
configurable test frequency. A value of 0 indicates that the connection is never explicitly
tested (which does not mean that it is never used). There are up to 18 connections (10 IP
Address and ports, and 8 PSTN numbers), with each point name within Straton configuring
a single test frequency. If a connection is not used, there is no need to include the point.
Dialout test frequency point names must take the form:
CFG_TEST_FREQ_IP_[0 – 9]
CFG_TEST_FREQ_PSTN_[0 – 7]
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