Micromod Micro-DCI: 53SL5100A Single Loop Controller - Manual (Page 49)

Single Loop Process Controller Instruction Manual
Configuration Parameters 41
4.0 Configuration Parameters
The configuration parameters provide the latitude to define the instrument’s personality attributes, so that
while still functioning within its designed specifications, it can perform application requirements with greater
refinement.
Typical configuration parameters are the fine tuning variables to set the instrument’s responsiveness: the
indicator zero point and span; the display tag names; engineering units of the process variable; and alarm
limits, etc. IT IS NOT NECESSARY TO DEFINE ALL OF THE CONFIGURATION PARAMETERS, as
commonly used preset values may not have to be altered, certain parameter selections eliminate others,
and the process application itself may not require specific instrument attributes.
Although all resident in a memory database as datapoints, the configuration parameters are clustered into
modular groups that may have specific hardware identities (e.g., the ANI, ANO, CCI, and CCO circuits
illustrated in
Figure 4-1 through Figure 4-4 ), or may represent software-controlled functions that are not
specific to any one hardware element.
4.1 Datapoint Types
A parameter can be any one of six data types. Each data type represents a specific data format: integers,
alphanumeric text strings, etc. A database module containing multiple parameters can have a mix of data
types. The data types are defined in
Table 4-1 .
Table 4-1. Datapoint Types
Type Byte Size Format
L 1 bit
Represents a single binary bit that can have the value of 0 or 1.
B 1 Represents a positive integer with values from 0 to 255.
C 3 Represents real analog (floating point) values that have a
resolution of one part in 32,768 (15 bits) and a dynamic range of
± 10
38
.
H 5 Represents high precision analog (floating point) values that
have a resolution of one part in 2 billion (31 bits) and a dynamic
range of ± 10
38
.
A 10 Represents text strings that can be 10 characters long.
F 5 Represents text strings that can be 5 characters long.