6. Function blocks6.1 Manufacturer function blocks6.1.5.3 DB - Data function blockGeneraleasyE4 base devices provide 32 data function blocksDB01…DB32.This function block makes it possible to copy bytes, words,or double words to an operand for only one cycle.Operating principleWhen there is a rising edge at function block input T_, the value at function block inputI1 will be passed to an operand connected to function block output QV. The operand willkeep that value until the next time it is overwritten,meaning it can be used, for example, to save reference values for function blocks.Note that the data function block only transfers the value in theprogram cycle in which it detects a rising edge. When the oper-and linked with output QV is overwritten by the program afterthe value is transferred, the value transferred with the datafunction block is lost.The function block and its parametersFunction block inputsDescription Note(Bit)EN 1: Activates the function block. The checkbox for theFunction block release by EN isnecessaryparameter must first be enabledT_ A rising edge at this input will transfer thevalue of function block input I1 to the operandconnected to QV.(DWord)I1 Value that is transferred to output QV when thefunction block is triggered.Integer value range:-2,147,483,648 to +2,147,483,647Assigning operandsYou can assign the following operands to the function block inputs that are numericinputs.Operands Value inputsConstant, timer constant xMD, MW, MB - Markers xNB, NW, ND - NET markers xnNB, nND, nND- NET markers xeasyE4 11/18 MN050009 EN www.eaton.com 317
