Schneider Automation Modicon Quantum Ethernet Instrukcja Użytkownika Pobierz pdf (Strona 171)

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Transferring Data Using Communication Blocks

33002479 06 07/2008 171

Get Remote Statistics

Description A get remote statistics operation can be used to read data from remote nodes on the

network. With each query, the remote communications processor supplies a

complete table of statistics even if the query does not refer to the entire table. It then

copies only the words that you queried into identified $MW addresses.

An operation can take several cycles to complete; it does not require a master data

transaction path. To program an MBP_MSTR block to get remote statistics, use

function code 7 (see Operational Function Codes, p. 151).

Network

Implementation

A get remote statistics operation can be performed on Modbus Plus and TCP/IP

Ethernet networks.

Control Block

Usage for

Modbus Plus

CONTROL[1] 7 = get remote statistics

CONTROL[2] Indicates the error status

CONTROL[3] Number of addresses to be read from the statistics data field (0 ... 37).

Note: The size of databuf must be at least the size of this entry.

CONTROL[4] First address from which the node statistics must be read. The number of

available statistics registers cannot be exceeded.

CONTROL[5]

...

CONTROL[9]

Routing address 1 ... 5 of the node.

The last byte in the routing path that is not 0 is the destination node.

1 2 ... 166 167 168 169 170 171 172 173 174 175 176 ... 381 382

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