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EII User Interrupt Executing (UIX)
Sub-Element Description
UIX - User Interrupt Executing EII:0/UIX
The UIX (User Interrupt Executing) bit is set whenever the EII mechanism
detects a valid input and the controller is scanning the PFN. The EII
mechanism clears the UIX bit when the controller completes its
processing of the EII subroutine.
The EII UIX bit can be used in the control program as conditional logic to
detect if an EII interrupt is executing.
EII User Interrupt Enable (UIE)
Sub-Element Description
UIE - User Interrupt Enable
The UIE (User Interrupt Enable) bit is used to enable or disable EII
subroutine processing. This bit must be set if you want the controller to
process the EII subroutine when an EII event occurs.
If you need to restrict when the EII subroutine is processed, clear the UIE
bit. An example of when this is important is if a series of math
calculations need to be processed without interruption. Before the
calculations take place, clear the UIE bit. After the calculations are
complete, set the UIE bit and EII subroutine processing resumes.
EII User Interrupt Lost (UIL)
Sub-Element Description
UIL - User Interrupt Lost
UIL (User Interrupt Lost) is a status flag that represents an interrupt has
been lost. The controller can process 1 active and maintain up to 2
pending user interrupt conditions before it sets the lost bit.
This bit is set by the controller. It is up to the control program to utilize,
track, and clear the lost condition.
Address
Data Format
binary (bit)
Address
Data Format
EII:0/UIE
binary (bit)
Address
Data Format
EII:0/UIL
binary (bit)
Publication 1763-RM001C-EN-P - October 2009
Using Interrupts
275
Type
User Program
Access
status
read only
Type
User Program
Access
control
read/write
Type
User Program
Access
status
read/write
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