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how do you interact (read, write) to different drives?

Created by: Juan Fdz at: 10/16/2010 12:53 AM (2 Replies)

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10/16/2010 12:53 AM	Rate (0)
Juan Fdz Posts: 20 Rating: (0)	Hi Could you please post how do you interact (read, write) to the different drives, I'm not really shure what to do in order to do this, should I call USS_DRV each time I want to communicate with a drive, or how do I state wich drive I'm talking to? Best regards Juan Splitted from I need sample code of communications between the s71200 and micromaster 420 using the USS Protocol.
Juan Fdz Posts: 20 Rating: (0)	Last edited by: O_Moderator at: 10/19/2010 11:23 AM new subject after splitting
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10/16/2010 8:08 AM	Rate (0)
UMENCHO Diamond Member Joined: 3/21/2006 Last visit: 11/1/2024 Posts: 10229 Rating: (1181)	Juan Fdz Hi Could you please post how do you interact (read, write) to the different drives, I'm not really shure what to do in order to do this, should I call USS_DRV each time I want to communicate with a drive, or how do I state wich drive I'm talking to? Best regards Juan Hello Juan, USS_Port - The “Port“ block parameter specifies the communication module via which the drives are connected. With each call of the block, communication with a drive is processed. Communication with the drive is asynchronous. This means that several cycles are executed in the S7-1200 controller before the data exchange with a drive is completed. This is why the “USS_PORT” block is usually called from a time-delay interrupt OB at the defined interval. The call interval corresponds to the time that is required for a transaction with the drive. The “USS_DRV“ block exchanges data with the drives by generating request telegrams and evaluating response telegrams. An instance data block is used to store the data. A separate USS_DRV block must be used for each drive in the network. So if you ahve 3 drives, you should call 3 times this block. On each its call this block generate instance DB. The USS_RPM block is used to read parameters out of the drive. It uses the same instance data block that was assigned to the relevant USS network. I suggest you to take a look at Pegaia' link. There you will find all info regards S7-1200 and USS protocol. best regards, Hristo Mihalev

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10/18/2010 5:09 PM

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Robster

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Here is another Configuration Example how to move several drives:

Simple networking and cascading of drives (CE-X8)

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