Installation guide

Introducing the Modbus Plus Network

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1.10 Using Peer Cop

1.10.1 Peer Cop Transactions

Point to point data can be transacted while a node holds the token and

during its token pass with Modbus Plus Peer Cop. Up to 500 words (16

bits each) can be directed to specific data references in node devices

prior to release of the token, and up to 32 words can be globally

broadcast to all nodes as part of the token frame.

Because all nodes monitor the network, each node can extract data that

is specifically addressed to that node. All nodes detect the token pass,

and can extract global data messages from the token frame. Defined

data references (like controller discretes or registers) are used as

sources and destinations. For example, a block of registers can be the

data source at the transmitting node, and the same block or another

block can be the data destination in the receiving node.

The delivery of Peer Cop data to destination nodes is independent of

the ‘next address’ used in the token pass. The token is always passed

to the next node in the network’s address sequence. The token frame,

however, can contain Peer Cop global messages that are unrelated to

the ‘next address’ and which are globally broadcast to all nodes.

Each node is configured through its Modicon panel software to handle

Peer Cop data transactions. Nodes must be specifically configured to

send and receive the data. Nodes which have not been configured for

Peer Cop will ignore the data transactions.

Sending Data

Nodes can be configured to send two kinds of Peer Cop data:

V Global Output Up to 32 words of data can be broadcast globally

from each node to all nodes. Source data references are specified in

the node configuration.

V Specific Output Up to 32 words of data can be transmitted to

any specific node. Multiple node destinations can be specified, up to

the maximum of 500 data words. Any nodes on the network can be

specifically addressed as destinations. A unique block of references

can be specified as the data source for each targeted node.