model 2704 controller installation and operation handbook - Soliton

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Alarm Operation 2704 Controller 7. Chapter 7 ALARM OPERATION 7.1. DEFINITION OF ALARMS AND EVENTS Alarms are used to alert an operator when a pre-set level or condition has been exceeded. They are normally used to switch an output - usually a relay - to provide interlocking of the machine or plant or external audio or visual indication of the condition. Soft Alarms are indication only within the controller and are not attached to an output (relay). Events - can also be alarms - but are generally defined as conditions which occur as part of the normal operation of the plant. They do not generally require operator intervention. An example might be to open/close a vent during a programmer cycle. The controller does not display the alarm status on the front panel. For the purposes of the operation of this controller, alarms and events can be considered the same. 7.1.1. Customisable Parameter Names Throughout this chapter parameter names shown in italics are customisable by the user when in configuration access level. The name of the parameter may vary, therefore, from instrument to instrument. Typical customisable parameter names are: Alarm names Loop names Module and input names Custom units Promoted parameters 7-2 Installation and Operation Handbook. Part No HA026502 Issue 1.0 Apr-00
2704 Controller Alarm Operation 7.2. TYPES OF ALARM USED IN 2704 CONTROLLER This section describes graphically the operation of different types of alarm used in the 2704 controller. The graphs show measured value plotted against time. The measured value may be any analogue value available in the controller. 7.2.1. Full Scale High The Process Variable (PV) exceeds a set high level Alarm ON ↑ MV Alarm setpoint Alarm OFF ↓ Hysteresis ↑ Hysteresis is the difference between the alarm ON value and the alarm OFF value. It is used to prevent relay chatter. Time → 7.2.2. Full Scale Low The Process Variable (PV) exceeds a set low level ↑ MV Alarm ON Alarm OFF Alarm setpoint ↓ Hysteresis ↑ Time → Installation and Operation Handbook. Part No HA026502 Issue 1.0 Apr-00 7-3
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2704 Controller Contents MODEL 2704
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2704 Controller Installation 2. CHA
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2704 Controller Appendix A A. APPEN
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2704 Controller Safety and EMC Info
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