MOTOROLA MVME167-004B Analog input card

To ensure that the same data is used throughout the entire PLC program, this data should be buffered to internal registers at one place in the program. However, in order to take advantage of the real time availability of the Interpolation Data value, the Interpolation Acknowledge bit, the Limit Switch State Bit, and the Interpolation Limit Switch State Bit should be used directly from their respective Input Registers. The data contained in the input registers consists of Status Data, the Scaled Data Value, Velocity Data, the Actual SSI data read from the sensor, and any associated Latched or Interpolated Data Values. Each channel (sensor) is made up of six DINT input words.

Input Register Description 

Data Value: This register contains the converted and scaled data from the sensor. That is, this value is the result of applying both the Setup Data and any offset from an Apply Preset operation to the Actual SSI data from the sensor. Velocity: This is the rate of change of the data value in Counts / Second. Latched Data Value: This register shows what the Data Value was when the Latch Input transitioned, depending on the configuration, from 0 to 1 and or from 1 to 0. The Latched Data Value will be reset to zero at power up. Also, the current Data Value will be placed in this register if the input is configured for the 0 to 1 transition and the input is active at power up.

                                                                        

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