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MVI71-MNET ♦ PLC Platform Reference

Modbus TCP/IP Interface Module User Manual

Page 70 of 109 ProSoft Technology, Inc.

June 23, 2009

Example of 240 words of read and write data (cfg file=10)

Data Files Description

N11:0 to 239 Read data

N12:0 to 239 Write data

Example of 2300 read and 3500 write data registers (cfg file=10)

Data Files Description

N11:0 to 999 Read data words 0 to 999

N12:0 to 999 Read data words 1000 to 1999

N13:0 to 299 Read data words 2000 to 2299

N14:0 to 999 Write data words 0 to 999

N15:0 to 999 Write data words 1000 to 1999

N16:0 to 999 Write data words 2000 to 2999

N17:0 to 499 Write data words 3000 to 3499

When the side-connect interface is utilized, registers in the first user data file for

the module are used for command control (offset 50 to 113). The format of these

control commands is similar to that described in the preceding section. The

following section describes the use of command control when the side-connect

interface is used:

Command Control Blocks

Command control blocks are special blocks used to control the module. These

blocks of data are located in the first file of the side-connect interface starting at

control blocks: event command control, command control, warm boot and cold

boot.

Event Command

Event command control blocks send Modbus TCP/IP commands directly from the

ladder logic to one of the client on the module. The following table describes the

format of these blocks.

Offset Description Length

50 2000 1

51 to 54 IP Address 4

55 Service Port 1

56 Slave Address 1

57 Internal DB Address 1

58 Point Count 1

59 Swap Code 1

60 Modbus Function Code 1

61 Device Database Address 1

1 2 ... 65 66 67 68 69 70 71 72 73 74 75 ... 108 109

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Prosoft-technology MVI71-MNET Manuale Utente Pagina 70