Bradley Smoker PLC-5 Using Special Programming Routines, 13-10Programming Considerations

13-10Programming Considerations

Using Special Programming Routines

4.Ensure that data does not change in the block-transfer data table output file until the BTW is complete.

	BT10:1							BTW data valid
				DN					OTU
	BTW data valid
				BT10:1
			/			BTW				EN
				EN	Rack			01			DN)
false-to-true
					Group			4		ER)
transition					Module			0
					Control Block			BT10:1
					Data File			N11:0
					Length			6
					Continuous			N
					BTW instruction must be
					above this logic
		BT10:1
		/					any logic that
		EN					modifies the
							BTW output file
							data

BTW data valid

OTL)

[END OF FILE] 41402

Use your design specification to determine if you need one or more of the following special programming routines:

•power-up routines

•fault-driven routines (necessary to safely manage equipment faults)

•time-driven interrupt routines (selectable timed interrupts)

•event-driven interrupt routines (controller input interrupts)

The following table explains when to use these programming features.

Publication 1785-UM012D-EN-P - July 2005