Specifications

Free Format Variables Reference
PlantScape Server and Client Configuration Guide 285
[ Offset ]
This is the offset within the history file. It locates the required value in the
history file. For example:
(1) Start from most recent value
(10) Start from 10th most recent value
An index number may be used as the offset, for example, “$2”.
[ Repeat ]
This number of history values will be retrieved starting from the offset and
going back in time. An index number may be used in the Repeat, for
example, “$3”.
Note • The Offset and Repeat fields are only required for history parameters (for
example, H1M). They should be left blank if a non-history parameter (for
example, PV) is specified.
• Entry type F assigns index numbers to the fetched history values by
incrementing from the index number specified. For details, see Example 1
below.
Examples
Example 1:
F 2 FIC123 PV F8.2 H6M(10) 3
In this example, “6 minute history” is required. The starting index is 2. The offset
is 10 and the repeat value is 3. The history values are reported in floating point
format.
Therefore:
H8H History Standard 8 hour average
H24H History Standard 24 hour average
H5SF History Fast snapshot
H1HE History Extended 1 hour snapshot
H8HE History Extended 8 hour snapshot
H24HE History Extended 24 hour snapshot
plscpcg.book Page 285 Monday, May 28, 2001 10:11 AM