Publication 1763-RM001C-EN-P - October 2009
276
Using Interrupts
EII User Interrupt Pending (UIP)
UIP (User Interrupt Pending) is a status flag that represents an interrupt is
pending. This status bit can be monitored, or used for logic purposes, in
the control program if you need to determine when a subroutine cannot
execute immediately.
This bit is automatically set and cleared by the controller. The controller
can process 1 active and maintain up to 2 pending user interrupt
conditions before it sets the pending bit.
EII Event Interrupt Enable (EIE)
EIE (Event Interrupt Enabled) allows the event interrupt function to be
enabled or disabled from the control program. When set (1), the function
is enabled, when cleared (0, default) the function is disabled.
This bit is controlled by the user program and retains its value through a
power cycle.
EII Auto Start (AS)
AS (Auto Start) is a control bit that can be used in the control program.
The auto start bit is configured with the programming device and stored
as part of the user program. The auto start bit automatically sets the EII
Event Interrupt Enable (EIE) bit when the controller enters any executing
mode.
Sub-Element Description
Address
Data Format
Type
User Program
Access
UIP - User Interrupt Pending
EII:0/UIP
binary (bit)
status
read only
Sub-Element Description
Address
Data Format
Type
User Program
Access
EIE - Event Interrupt Enabled EII:0/EIE
binary (bit)
control
read/write
Sub-Element Description
Address
Data Format
Type
User Program
Access
AS - Auto Start
EII:0/AS
binary (bit)
control
read only
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