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Knowledgebase Quick Starts
Interrupt
Ell - Event Input Interrupts
Reserved
STI - Selectable Timed
Interrupts
Note: Bits 7 to 115 must be set to zero.
# 18465 "Quick Start"
RTC Synchronization
Between Controllers
Publication 1763-RM001C-EN-P - October 2009
Element
Event 3
N/A
STI
To disable interrupt(s) follow these steps.
1. Select which Interrupt(s) to disable from the above table.
2. Locate the decimal value for each Interrupt(s).
3. Add the decimal values together if more then one Interrupt was
selected.
4. Enter the sum into the UID instruction.
For example, to disable EII Event 1 and EII Event 3:
EII Event 1 = 32 EII Event 3 = 04
32 + 04 = 36 (Enter this value in the UID instruction)
Notes on using Interrupt bits
If the Auto Start bit (AS) is set, this will start the interrupt on power up
and set the Timed Interrupt Enabled bit (TIE) automatically, allowing the
interrupt to execute. Shown in the above example.
If the AS bit is not set then the TIE bit must be set through the ladder logic
in order for the interrupt to execute.
The User Interrupt Enable bit (UIE) determines if the interrupt executes or
not.
The following example illustrates a message write from an SLC 5/03 or
higher processor to a Micrologix 1100 processor with RTC that has been
enabled.
This example can also be applied for messaging between MicroLogix
1100, 1200 and 1500 controllers. When messaging from a MicroLogix
1100/1200/1500 controller to MicroLogix 1100/1200/1500 it is
recommended that RTC:0 be used as the source instead of (S:37 - S:42).
Decimal Value
Corresponding Bit
4
2
1
bit 2
bit 1
bit 0
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