Length - Discrete Parameters

Discrete Parameter Length defines the initial Length of data read from field device for Tags and BLOCK:PARAMETERS created using this parameter.  Parameter Length can save time and typing or enforce a standard if this parameter will be used in a predictable way to create Tags or Blocks.

For Discrete Tags and Parameters this determines the number of States in the tag. If three bits are read or written from the field device, up to 8 state descriptors are used to display the 'State" of the tag's value.  If a single bit is read or written form the device, then only two state descriptors are used.

Length                   State Descriptors Used

                   1                  STATE 0 and STATE 1

                   2                  STATE 0, 1, 2, and STATE 3
3                  STATE 0 thru STATE 7


Range:                    1 to 3
Field Type:            analog 
Tag fields:             For Discrete Tags, length can be inferred from .SPANHI


Figure 5-13Change Dialog Box for 8-State Discrete Tag


Figure 5-14Change Dialog Box for 2-state Discrete Tag