Emerson P/N 400361-00 User Bits View, Adding and Deleting Variables, Using User Bits in a Program

Adding and Deleting Variables

The default number of variables is ten. To add more user variables, click on the up arrow next to the "Number of User Variables" spinner box on the User Variables view. The maximum number of user variables is 256.

Only the last variable in the list can be deleted. To delete the last variable, simply click on the down arrow next to the "Number of User Variables" spinner box.

User variables are all Global variables. A Global variable means that it can be accessed from any program.

Using User Variables in a Program

Once setup, User Variables can be used inside a program for calculations, motion profile setup, or any other user-desired function. To access User Variables, click on the "Drag In Variables" icon in the user program toolbar. User Variables is a branch in the Drag In Variables selection box.

7.3.15 User Bits View

User Bits act just like User Variables except that they allow the user to store bit level parameters rather than 32-bit parameters. The user may customize each User Bit by giving it a Name and an Initial Value.

The Name for each bit may be up to 12 characters in length, and must start with a alpha character (non-numeric character). Spaces are not available in the Name for a User Bit, however the underscore character ("_") may be used.

The Initial Value for each user bit is configured using a checkbox for the specific bit. To make the Initial Value "On" or "Active", simply enable the checkbox for that bit. The default value for each User Bit will be "Off" or "Inactive".

Figure 83 shows an example of the User Bits view.

Figure 83: User Bits View

The following parameters are part of the User Variable definition:

Name - This is a twelve-character string that allows the user to assign a descriptive name to the bit. Spaces are not allowed in the name of a user bit.

Initial Value - This is the initial value of the user bit that will be used on power up. If the user bit has been configured as a Save to NVM parameter, then the value in NVM will overwrite the initial value on power up.

Using User Bits in a Program

User Bits may be accessed in a User Program. Bits are turned on by setting them equal to ON, TRUE, YES, SET, or ENABLE (not case sensitive), and can be deactivated by setting them equal to OFF, FALSE, NO, CLEAR, or

DISABLE.

Setting an individual bit equal to 1 or 0 in a user program will cause a red dot error. The Boolean values listed above must be used.

Adding and Deleting User Bits

User Bits can be added or deleted in groups of 32-bits. Individual bits cannot be added or deleted. The default number of User Bits available is 32. To add an additional 32 bits, simply click on the "Up Arrow" on the spinner box at the top of the User Bits view (see Figure 47).

To decrease the number of User Bits by 32, click the "Down Arrow" on the spinner box. When decreasing the number of User Bits, it is always the last 32 bits in the list that will be eliminated.

User 32-bit Bit Register and User Bit Masking

When using different communications protocols (i.e. DeviceNet, Profibus, Modbus), it is often desirable to access groups of User Bits in a single parameter, rather

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