MOTOROLA MVME121 axial displacement  module

Setting the Apply Preset bit causes the module to generate an internal offset value that is applied to the Data Value before it is reported to the PLC. This internal offset is saved in the 7264 module’s Flash memory, so it is not necessary to home the module at every power up. Please note that using a Message Instruction to program a channel’s setup data will clear the internal offset generated by an Apply Preset operation. WARNING The 7264 module’s Flash memory is guaranteed for 10,000 write cycles before writing to it will cause it to fault. Therefore continuously Applying the Preset should be avoided. If your application requires you to continuously Apply the Preset, consider calculating and Applying the Preset in your PLC program.

Count Direction

This parameter is useful if your Data Value represents a linear position. It gives you the ability to reverse the direction of motion needed to increase the position count. For simplicity’s sake, the two values for this parameter are called Positive Direction and Negative Direction. When this parameter is set to its default of Positive, the Data Value is not changed. When this parameter is set to Negative, the Data Value is multiplied by -1 before it is reported. For linear transducers, this has the effect of reversing the direction of motion needed to increase the count. When using LDT’s and the Count Direction is set to Positive, the Data Value usually increases as the magnet moves away from the head of the LDT. When the Count Direction is set to Negative, the Data Value increases as the magnet moves towards the head of the LDT. You will need probably need to Apply the Preset to the Data Value after you program the Count Direction parameter.

                                                                        

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