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GRD’s User Manual Exemys Figure 58 – Historical of analog inputs of the GRD3003 8.3.5.3 Historical by alarm This criterion defines a band of operation through a maximum and a minimum. When the analog input exceeds a maximum value a historical by maximum is generated, when the analog input is less than the minimum a historical by minimum is generated and when the analog input exceeds a maximum value or from a minimum value to a normal value placed between both values a historical by normal value is produced. We can follow the evolution of the input when it fluctuates between the specified limits. In addition to the maximums and minimums a value of hysteresis must be defined to avoid the case in which if the analog signal oscillates over a threshold value historical would continually be generated. www.exemys.com Rev. 2.2.0 Julio 2010 79
