B&B Electronics DTB Series user manual Alarm Outputs, Alarm Type, Alarm Output Operation

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Alarm Outputs

There are up to three groups of alarm outputs and each group allows thirteen alarm types in the initial setting mode. The alarm output is activated whenever the process temperature value (PV) is getting higher or lower than the set point of alarm limit.

Set	Alarm Type		Alarm Output Operation
Value
0	Alarm function disabled	Output is OFF
1	Deviation upper- and lower-limit:	ON
	This alarm output operates when PV value is higher than the setting value SV+(AL-H) or lower than the OFF
	setting value SV-(AL-L).	SV-(AL-L) SV					SV+(AL-H)
2	Deviation upper-limit:	ON
	This alarm output operates when PV value is higher than the setting value SV+(AL-H).	OFF
						SV	SV+(AL-H)
3	Deviation lower-limit:	ON
	This alarm output operates when PV value is lower than the setting value SV-(AL-L).	OFF
		SV-(AL-L) SV
4	Reverse deviation upper- and lower-limit:	ON
	This alarm output operates when PV value is in the range of the setting value SV+(AL-H) and the setting OFF
	value SV-(AL-L).	SV-(AL-L) SV						SV+(AL-H)
5	Absolute value upper- and lower-limit:	ON
	This alarm output operates when PV value is higher than the setting value AL-H or lower than the setting	OFF
	value AL-L.			AL-L				AL-H
6	Absolute value upper-limit:	ON
	This alarm output operates when PV value is higher than the setting value AL-H.	OFF
								AL-H
7	Absolute value lower-limit:	ON
	This alarm output operates when PV value is lower than the setting value AL-L.	OFF
				AL-L
8	Deviation upper- and lower-limit with standby sequence:	ON
	This alarm output operates when PV value reaches set point (SV value) and the value is higher than the OFF
	setting value SV+(AL-H) or lower than the setting value SV-(AL-L).	SV-(AL-L) SV						SV+(AL-H)
9	Deviation upper-limit with standby sequence:	ON
	This alarm output operates when PV value reaches set point (SV value) and the reached value is higher OFF
						SV
	than the setting value SV+(AL-H).						SV+(AL-H)
10	Deviation lower-limit with standby sequence: this alarm output operates when PV value reaches the set	ON
	point (SV value) and the reached value is lower than the setting value SV-(AL-L).	OFF
		SV-(AL-L) SV
11	Hysteresis upper-limit alarm output:	ON
	This alarm output operates if PV value is higher than the setting value SV+(AL-H). This alarm output is OFF
	OFF when PV value is lower than the setting value SV+(AL-L).					AL-L AL-H
12	Hysteresis lower-limit alarm output:	ON
	This alarm output operates if PV value is lower than the setting value SV-(AL-H). This alarm output is OFF OFF
	when PV value is higher than the setting value SV-(AL-L).				AL-H AL-L
13	CT alarm output:	ON
	This alarm operates when the current measured by transformer (CT) is lower than AL-L or higher than OFF
	AL-H (This alarm output is available only for the controller with current transformer).			AL-L SV					AL-H

14When program control is end status, alarm output is ON.

15When RAMP UP status happens to PID program control, alarm output is ON.

16When RAMP DOWN status happens to PID program control, alarm output is ON.

17When SOAK status happens to PID program control, alarm output is ON.

18When RUN status happens to PID program control, alarm output is ON.

Note: AL-H and AL-L include AL1H, AL2H, AL3H and AL1L, AL2L, AL3L

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