
Software Description
Tank Gate Interface
38
Installation and Operations Manual
Parameters
The database parameters used by the SCALER point are listed and described below:
Application
The SCALER point allows you to perform simple math functions such as conversion of units. The
SCALER point takes the value from user-specified database references, multiplies each by a
Configuration Parameters
Function
Tag
A Tag can contain 15 bytes of data and can include any printable ASCII
character. Tags can be used to identify points indicating the use of the
point such as “Eng Converter” . The default tag is set to “SCALER.00”.
PntRef1
PntRef2
PntRef3
The PntRef parameters determine the input source for the SCALER point to
monitor. Up to three references may be specified. RefValue1 is the X term,
PntRef2 is the Y term, and PntRef3 is the Z term. If a reference is not
specified, then it is not used in the equation.
A
Constant that is multiplied with RefValue1
B
Constant that is multiplied with RefValue2
C
Constant that is multiplied with RefValue3
K
Constant K
Deadband
Change of State deadband
Report
Causes automatic notification to the Host (in response to a Change of State
Request) when the Value changes State. Parameter value can be High, Low
or No. Report=No disables notification. Points with Report = High will be
sent before points with Report = Low. The default is No.
Maxtime
Specifies the maximum time (in secs) between automatic Change of State
responses being sent to the Host. Report must be set to either Low or High
for the Value parameter to be sent in response to a Change of State
Request. A value of 0 disables this option. Non-zero values cause
responses to be sent although the value may have not changed since the
last message. The default is 60.
Dynamic Parameters
Function
Value
Output value for the SCALER point.
Value = Ax + By + Cz + K.
x corresponds the RefValue1, y is RefValue2, and z is RefValue3.
RefValue1
RefValue2
RefValue3
RefValue1 - 3 are the values of the PntRef1 - 3 parameter references.
The references can be to any point that produces a floating point value.
Value1
Value parameter converted to Integer format
PntStatus
Byte value indicating status of point Values are:
0: No error
15: Invalid Type for PntRef
16 Invalid Number for PntRef
17 Invalid Param for PntRef
19: PntRef point does not exist
25: PntRef is not defined
Elapse
Time the SCALER point last executed.
PntCheckSum
CRC-16 Checksum of point's static Configuration Parameters
Содержание 8300 series
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