SEW MDS60A0150-503-4-00 Digital output module

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SEW MDS60A0150-503-4-00 Digital output module

 Data is sent on the transmission path when the token is received after data is updated in communication IC shared memory of the MDS60A0150-503-4-00 Module.  The token (the right to send data) is passed between physically connected MDS60A0150-503-4-00 Modules in order starting from the lowest station number. If there is no data to send to the stations, only the token is passed on the transmission path. Therefore, the token cycle time is almost constant for a short cycle. If there is data to send to the remote stations, link data flows on the transmission path in addition to the token. There is variation in the token cycle time because the data size and update timing on the transmission path depend on the link assignment size and link assignment scan settings.

 The link data is written via the work memory to the module shared memory one station at a time when the MDS60A0150-503-4-00 Module receives link data from the transmission path.  The module shared memory uses a single buffer. Therefore, if data is received by the MDS60A0150-503-4-00 Module while the Machine Controller is reading data, the received data is not written to the module shared memory and it remains in work memory until the Machine Controller completes reading data. Thus, using module shared memory causes access competition between the MDS60A0150-503-4-00 Module and Machine Controller.

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