Product manual

B Protocols TAC Xenta Server – Gateway, Technical Manual
172 (184) Schneider Electric Buildings AB, June 2011
04-00124-06-en
• Storage# – Allows the applicable storage level of the Metered
Value to be defined. Normally this can be left blank or set to 0 to
select the instantaneous metered value. However, to read stored or
historical metered values a whole number between 1 and 10 can be
entered to represent the storage depth of the required value.
• Sub-Unit – Allows the applicable sub-unit level of the Metered
Value to be defined. Normally this can be left blank or set to 0 to
select the only metered value of a specific field type. However, if a
meter provides more than one value of a specific field type, such
as multi- zone Energy [Wh] readings, then individual values may
be selectable using a sub-unit number.
• Tariff# – Allows the applicable tariff type of the Metered Value to
be defined. Normally this can be left blank or set to 0 to select the
only metered value of a specific field type. However, if a meter
supports multiple tariff regimes then the individual values may be
selectable using a tariff number.
• I/O Signal Direction – The Xenta 913 can only be used to moni-
tor a register’s value, so all I/O column parameter should be left as
Read-only (R).
• Coefficient Gain and Offset – Allow the metered value to be
converted into the desired absolute units. In most cases it will
acceptable to use the default gain and offset of 1 and 0. However,
other coefficients may be entered if preferred, such as converting a
Volume [m3] value from cubic meters to liters.
Note
• Stored values are likely to only update periodically, such as once
per month. So it is unlikely that a storage value greater than 1
will ever need to be monitored by the Xenta 913.
Note
• Sub-Unit may also be referred to as Module or just Unit in some
meter’s documentation.
Note
• Different tariff versions of a given metered value will not nor-
mally update at the same time, because only one tariff can apply
at any given instant.