Prosoft-technology MVI71-MNET Manuale Utente Scaricare il pdf (Pagina 77)

Reference MVI71-MNET ♦ PLC Platform

User Manual Modbus TCP/IP Interface Module

ProSoft Technology, Inc. Page 77 of 109

June 23, 2009

1 The client driver obtains configuration data from the MNET.CFG file when the

module restarts. The configuration data obtained includes the timeout

parameters and the Command List. These values are used by the driver to

determine the type of commands to be issued to the other nodes on the

Modbus TCP/IP.

2 After configuration, the client driver begins transmitting read and/or write

commands to the other nodes on the network. If writing data to another node,

the data for the write command is obtained from the module's internal

database to build the command.

3 Presuming successful processing by the node specified in the command, a

response message is received into the client driver for processing.

4 Data received from the node on the network is passed into the module's

internal database, assuming a read command.

5 Status data is returned to the PLC processor for the client and a Command

List error table can be established in the module's internal database.

Client Command List

In order for the client to function, the module's Client Command List must be

defined. This list contains up to 100 individual entries, with each entry containing

the information required to construct a valid command. This includes the

following:

 Command enable mode ((0) disabled, (1) continuous or (2) conditional)

 IP address and service port to connect to on the remote server

 Slave Node Address

 Command Type - Read or Write up to 100 words per command

 Database Source and Destination Register Address - Determines where data

will be placed and/or obtained

 Count - Select the number of words to be transferred - 1 to 100

 Poll Delay (1/10

second)

1 2 ... 72 73 74 75 76 77 78 79 80 81 82 ... 108 109

Nessun commento

Prosoft-technology MVI71-MNET Manuale Utente Pagina 77