ABB COMMANDER 1900 Series Programming Manual

Also see for COMMANDER 1900 Series: Programming guide Installation guide User guide Operating guide

Contents

ABB COMMANDER 1900 Series Programming Manual Manual pdf 28 page image

26…4 ADVANCED CONFIGURATION LEVEL4.2 Set Up LogicInformation.• 4 logic equations• 7 elements per equation• OR/AND operators• Can combine internal and external digital signals – i.e. alarms, digital inputs, other logic equation results and real timeevents (timer option).For each equation, the logic elements 1 to 7 are arranged sequentially, as shown below. Odd numbered elements are used forlogic inputs and even numbered elements for logic gates.Logic inputs must be set to one of the digital sources listed in Table 3.1 on page 15.Logic gates must be set to ANd, Oror End. Setting an element to End terminates the equation.• Alarm A1 – set to high process trip at 50 ft• Alarm B1 – set to high process trip at 80 ft• Alarm C1 – set to fast rate trip at 10% ofrange per hour (10 ft/hr)• Manual override switch:Connected to digital input 1.1Digital input numberModule numberNegative polarityVolt-free switchingFlow Conditions Input ElementsClose reservoir control valve if:• Reservoir level >50 feet ANDrate of change >10 ft/hrOR• Reservoir level >80 ftOR• Manual override switchoperatedEntering the Logic Equation50feet80feetControlValveLevel SensorRelay OutputManual OverideAlarm B1Alarm A1TimeLevelAlarm C1Rate ofchange> 10ft/h/AL–A1AL–C1AL–B1dIG–1.1ANdOrOrEQN1.1EQN1.3EQN1.2EQN1.4EQN1.6EQN1.5EQN1.7Example – Reservoir level monitoring using:• process variable 1 with an engineering range 0 to 100 feet• logic equation 1 result assigned to relay 1.1 which is used to operate the control valve.Note. Elements on each equation are calculatedsequentially, i.e. elements 1, 2 and 3 are evaluated first andthis result is then combined with elements 4 and 5. Similarly,this resultant is then combined with elements 6 and 7 to givethe logic equation result.LogicInputsANd/OrEQN1.1EQN1.3EQN1.2EQN1.4EQN1.6EQN1.5EQN1.7ANd/OrANd/OrResult