Rockwell Automation PLC-5 Fieldbus Solutions for Integrated Architecture User Manual - Manual (Page 80)

Publication 1757-UM006A-EN-P - May 2002
2-36 Integrating Fieldbus into Rockwell Automation Logix System
List of Valid Values
Standard type will have the following enumerated values.
Table 2.L Attribute Definitions
Attribute Definition
DD Member Id A unique number which identifies the alert. This number will be
assigned as part of the development of the Device Description (DD). A
DD member Id is assigned if an object is defined as part of a structure.
A value of zero (0000) will be used for the DD member Id if the object is
not part of a structure.
Index The location of the alert in the OD.
Meta Type Identifies the alert as a record (multiple values of different types).
Type Name Identifies the data format as a data structure associated with the Meta
type.
Sub-index Attributes of an object which may be individually accessed through the
FB_Read and FB_Write service by using the sub-index number with the
object index number. Sub-index numbers are assigned based on Meta
type.
Data Length The number of bytes required to represent the data type.
Units The engineering units in which the value is represented.
Usage Indication of whether the alert may be linked to a block parameter.
Storage Specification that alert must be stored in dynamic (D) memory.
Table 2.M Standard type valid values
Valid Values Meaning
0 Undefined
1 LO - Low limit
2 HI - High limit
3 LO LO - Critical low limit
4 HI HI - Critical high limit
5 DV LO - Deviation low
6 DV HI - Deviation high
7 DISC - Discrete
8 BLOCK - Block Alarm
9 UPDATE - Static data update
10 WRITE - Write protect changed