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Command Groups Column Definitions

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Command Group Name Column

This column specifies the name of the profile command group that is used to access the variables shown in the Variables (VAR) column. All command groups are listed in the Power Tool Command Group: drop-down list. Each entry in the list contains the command group name followed by a description. The command group format is:

CommandGroupName – CommandGroupDescription

The description may include the actual I/O Device command code used in the command group. The relationship between the profile command group name and I/O Device command codes is shown in the tables.

 

PT (Poll Time) Column

The PT column specifies how the Polling Setup Primary Rate field should be set.

N Normal - enter any valid poll time or polling rate
D Disable - Disable poll time

 

Variables (VAR) Column

This column specifies the name of each variable in the Command Group. Variable names are in all caps. The variable name is used in the DBB I/O Address field to access the variable’s value. Variable names enclosed in < > indicate a field in the Power Tool dialog box that must be filled in by the user. Fields available to the user are given below.\

<start> Specifies that you must use the Starting Address: field to specify the variable you want to access or the start of the array (block of data) you want to access. For example, the Modbus protocol uses this field for "start address".
<data items> Specifies that you must use the Data Items: field to specify the number of variables you want to access. For example, the Modbus protocol uses this field for the number of data items to access.

 

DT (Data Type) Column

The DT column specifies the data type and dimension of each variable. Datatype helps determine the DBB block type to use and DIM provides a method to specify the number of data elements in an analog or digital variable array. Remember, the format of a DBB block I/O address is DBN:VAR:DIM (DataBlockName:VARiableName:DIMension).

The format of the DT column is X/DIM; where X is the data type and "DIM" is the number of data elements contained in the variable. If /DIM is missing, the number of elements is equal to one.

The number of elements can also be length dependent. /L will be used to indicate this case. If the dimension is /L, then DIM is dependent on the value entered by the user in the Data Items: field. The range of DIM would be 0 to L-1.

Several examples are given below.

D/8 Specifies eight bits of digital data (Packed digital). Valid DBB addresses would be DBN:VAR:0 to DBN:VAR:7
D/L Specifies that the number of bits is dependent on the value entered into the Data Items: field. Valid DBB addresses would be DBN:VAR:0 to DBN:VAR:(L-1)
D/1 Specifies one bit of digital data. The valid DBB address would be DBN:VAR:0
I8 Specifies one 8 bit integer variable. The valid DBB address would be DBN:VAR:0
I8/5 Specifies five 8 bit integer variables. Valid DBB addresses would be DBN:VAR:0 to DBN:VAR:4
I16 Specifies one 16 bit integer variable. The valid DBB address would be DBN:VAR:0
I16/L Specifies that the number of 16-bit integers is dependent on the value entered into the Data Items: field.. Valid DBB addresses would be DBN:VAR:0 to DBN:VAR:(L-1)
F Specifies one 4-byte float variable. The valid DBB address would be DBN:VAR:0
F/3 Specifies three 4-byte float variables. Valid DBB addresses would be DBN:VAR:0 to DBN:VAR:2
T10 Specifies a 10 character text string variable. The valid DBB address would be DBN:VAR:0

 

VAR R/W Column

This column specifies if the variable is Read Only R, Write only W, or Read and Write R/W.

 

Valid DBB Blocks Column

This column specifies the valid DBB blocks that can be used with the variable shown in the Variable (VAR) column.

 

Description Column

This column gives the description of the Variable shown in the Variable (VAR) column.

 

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