SEW MHD093C-058-PG0-AN Motor

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SEW MHD093C-058-PG0-AN Motor

 The timing at which the Machine Controller of the local station updates receive data from the MHD093C-058-PG0-AN Module depends on the scan that is assigned to the remote stations in the SCAN setting on the Link Assignment Tab Page. The figure above is an example of assignment to H scans. Data is input during the input processing in H scan processing.  The module shared memory uses a single buffer. Therefore, the Machine Controller cannot read data if the MHD093C-058-PG0-AN Module is writing receive data. In that case, the Machine Controller attempts to obtain the access right twice for reading. If the access right cannot be obtained, the Machine Controller will stop updating data to minimize the scan time extension. (The scan time will be extended slightly, however, due to processing to obtain the access right.)

 A delay in updating receive data by the Machine Controller occurs due to access competition between the MHD093C-058-PG0-AN Module and Machine Controller in the module shared memory of the MHD093C-058-PG0-AN Module. Writing data received by the MHD093C-058-PG0-AN Module and reading data received by the Machine Controller are performed asynchronously, but both operations may be performed synchronously due to the link assignment settings or scan time settings. In that case, continuous access competition will occur and cause a delay in updating data. The following is a list of possible causes and corrective actions.

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