ProSoft Technology MVI71-MNET - Manual (Page 70)

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
register offset 50. The current version of the software supports four command
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