Installation guide

Introducing the Modbus Plus Network

890 USE 100 00

1.10.2 A Peer Cop Example

Figure 14 shows a network with three nodes that are handling Peer

Cop data transfers. Other nodes are also present elsewhere on the

network.

GLOBAL OUT:

NODE

GLOBAL IN FROM 2:

4001740048 (32)

GLOBAL IN FROM 18:

30010 (1)

1009710129 (2)

4020040202 (3)

SPECIFIC OUT TO 5:

SPECIFIC OUT TO 7:

SPECIFIC IN FROM 2:

SPECIFIC IN FROM 10:

SPECIFIC IN FROM 2:

1001710048 (2)

4010040131 (32)

1020110216 (2)

TOKEN PASS (TO NODE 3)

TOKEN

MONITOR

TOKEN

MONITOR

Figure 14 Peer Cop Example

Node 2 currently holds the token and passes it to the next addressed

node (node 3). Nodes 5 and 7 monitor the pass and extract data as they

have been configured to do.

Node 2 transmits two words of Specific Output for node 5 from its

references 10017 ... 10048 (32 bits of discrete reference data, a total of

two 16-bit words). It also transmits these same references as Specific

Output for node 7. In the token frame, node 2 transmits 32 words of

Global Output from its references 40017 ... 40048.

Node 5 has been configured to receive Global Input from node 2. It

places one word into its reference 30010, and two words (32 discretes)

into references 10097 ... 10129. Node 5 indexes into the 32 words of

data and maps its 3 words into these references. Node 5 has also been

configured to receive Specific Input from node 2, and places it into

references 10017 ... 10048. Note that the application uses identical

references for this data in nodes 2 and 5. The references could have

been different if required.