Bradley Smoker PLC-5 Defining a Selectable Timed Interrupt, Do the Following Status File

Using Selectable Timed Interrupts 17-3

Defining a Selectable Timed Interrupt

The block-transfers in an STI should only be between the controller and local I/O. Remote block-transfer instructions in an STI cause the controller to resume executing the user program while waiting for the block-transfer to complete. If you want the STI to run to completion before returning to your main logic program, include an UID and UIE instruction pair in your STI program file. Place the block-transfer instruction inside of a UID/UIE pair.

ATTENTION When the controller runs an STI with a block-transfer

instruction to a remote chassis, the MCP resumes processing while waiting for the block-transfer to complete unless a UIE/UID instruction pair is used.

To configure a selectable timed interrupt, you must specify:

In this Field	Do the Following	Status
		File
Setpoint	Enter the time interval between interrupts (1 to 32767	S:30
	ms).
	If you are not using or want to disable an STI, enter
	zero.
	Important: Remember to specify an interrupt time
	longer than the STI file execution time. If you do not,
	the controller sets a minor fault (S:10, bit 2).
File number	Enter the number of the program file that contains the	S:31
	STI program.
	If you are not using an STI, enter zero.

Publication 1785-UM012D-EN-P - July 2005