Monday, May 23, 2011

Transaction Properties of PLC WorkShop for Modicon





Server IP Address
It shows the remote device address that you are communicating with.

Unit ID
It includes the target Unit value ID. This is an identifier for a transactions pair (specially transactions of Link Client/Server). The transaction pair has to have corresponding Unit ID's. An instance situation would contain a single Server Write transmits data to 3 matching Client Reads in a device of remote. All three Client Read transactions will recognize the data transferred from the transaction of single Server Write as long as the Unit ID's corresponding.

Health Timeout
It shows a value in milliseconds that corresponds to the time length to wait for a respond for every transaction.

Repetition Rate
It shows a value in milliseconds that corresponds to the time length to wait before recur the transaction. A 0 value designates the shortest waiting time.

Function
Below are function types:
• Read: An independent read in which a local device interprets data from a device of remote.
• Write: An independent write in which a local device types data to a device of remote.
• Read/Write: An independent read/write in which a local device interprets data from and types data to a device of remote.
• Link Client Read: The function type of bilateral, in which a local device reacts to a write transaction from a device of remote, which have to have a corresponding server write.
• Link Client Write: The function type of bilateral in which a local device writes to a device of remote which have to have corresponding server read and write.
• Link Client Read/Write: The function type of bilateral in which a local device writes and reads data from and to a remote device that have to have a corresponding server read.
• Link Server Read: The function type of bilateral in which a local device starts a read from a device of remote. The remote device has to have a corresponding client write.
• Link Server Write: The function type of bilateral in which a local device writes to a remote device. The remote device has to have a corresponding client read.
• Link Server Read/Write: The function type of bilateral in which a local device reads and writes data to and from a remote device that have to have a corresponding client read/write.


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