Variables Grid
Use the variables grid of the Dictionary to manage the variables for the device or program organization units (POUs). Each device and POU has an instance of the grid. For the device, the grid displays global variables. For POUs, the grid displays local variables. Perform these tasks from the variables grid:
- Create variables
- Edit existing variables
- Drag variables
- Delete variables
- Sort variables in the grid
- Filter variables in the grid
For global or local variables, the properties are the following:
Column | Description | Possible Values | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Name | Name of the variable | Limited to 32 characters beginning with a letter or single underscore followed by letters, digits, and single underscore characters. Names cannot be reserved words, defined words, or data types. Names must be unique. | |||||||||||||||
Logical Value | Available while running online, monitoring, and simulating applications. Displays the value used by code being executed on the Trusted® controller. This cell enables forcing the value of variables. | Values display according to the variable data type | |||||||||||||||
Physical Value | Available while running online and monitoring applications. Displays the value sent to and received from the drivers. Enables forcing the value of variables. | Values display according to the variable data type | |||||||||||||||
Lock | Available while running online, monitoring, and simulating applications. The indication of whether the value of the I/O variable is locked. | Yes or No | |||||||||||||||
Data Type | Data type of the variable | BOOL, DINT, REAL, TIME, MESSAGE or function blocks. | |||||||||||||||
String Size | Maximum length for String-type variables | String capacity is limited to 252 characters excluding the terminating null character (0), a byte for the current length of the string, and a byte for the maximum length of the string | |||||||||||||||
Wiring | (Read-only) Generated by the I/O wiring tool indicating the I/O channel wired to the variable | Uses the syntax of Directly Represented Variables | |||||||||||||||
Attribute | Read and write access rights of a variable | Possible values are Read or Read/Write. The possible values depend on the direction of the variable. When wiring a variable, the attribute changes to match the direction required by the I/O device. | |||||||||||||||
Direction | For the local variables of a program, indicates the variable is internal. | Possible value is Var | |||||||||||||||
For the local variables of a function or function block, indicates whether the variable is internal, an input, or an output. | Possible values are Var, VarInput, or VarOutput | ||||||||||||||||
For the global variables of a device, indicates the variable is internal, for use with I/O wiring, or defined for an I/O channel. | For global variables, the possible value is VarGlobal. Wired variables must have the VarGlobal direction. When adding I/O devices, I/O channels are assigned the VarDirectlyRepresented direction. | ||||||||||||||||
Modbus Address | Modbus address of the variable | Possible Modbus address depends on the data type and extended attributes:
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Message True | User-defined text that is used by the SOE Collector in the Trusted Sequence of Events and Process Historian Package when the value of a Boolean variable data type is TRUE. | Excluding: , % “ and without leading and trailing spaces | |||||||||||||||
Message False | User-defined text that is used by the SOE Collector in the Trusted Sequence of Events and Process Historian Package when the value of a Boolean variable data type is FALSE. | Excluding: , % “ and without leading and trailing spaces | |||||||||||||||
Retained | Indication of whether the Trusted controller saves the value of the variable at each cycle. For details on retaining or backing up variables, refer to the SYSTEM operator. | Yes or No | |||||||||||||||
Initial Value | Value held by a variable when the Trusted controller starts the execution of the code | The initial value of a variable. Possible values are the default value, a value assigned by the user when defining the variable, or the value of the retain variable after the Trusted controller has stopped. | |||||||||||||||
Unit | Unit of measure of the logical and physical values | Free format | |||||||||||||||
Comment | User-defined text | Plain text |
Customize the Dictionary environment by arranging the columns to display.
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