Emerson Process Management Rosemount 2410 manual Relay Zones, Reference Manual

Reference Manual

300530EN, Rev BA September 2012

Figure C-5. Relay zones

Set Point 2

Source signal

Set Point 1

Relay state

Rosemount 2410

Relay Zones

You can use one or two set points for relays connected to the Rosemount 2410 Tank Hub. Consequently, there are two or three zones in which different relay states can be specified. For each zone you can set any of the three available relay states Normal, Alarm or Toggle.

For each set point you can specify a hysteresis zone preventing the relay from switching back to its previous state as long as the source variable is changed only small amounts around a certain set point. The principle of relay set points and hysteresis zones is shown in the figure below. Note that in this example only two states are used.

			3		ZONE 3
					Hysteresis zone
			4
2					ZONE 2
1
					Hysteresis zone
					ZONE 1
	Relay State				Time
				Relay State Zone 3
	Zone 1
		Relay State			Relay State Zone 2
		Zone 2

1.The source signal passes set point 1, and the relay state changes according to the definition for Zone 1.

2.When the source signal returns into Zone 2, it does not change to the Zone 2 state until it has passed the hysteresis zone.

3.The source signal passes set point 2, and the relay state is changed according to the definition for Zone 3.

4.The relay switches back to the Zone 2 relay state when the source signal has passed set point 2 and the associated hysteresis value.

Appendix C. Advanced Configuration C-9