ProSoft Technology MVI56E-MNETR - Manual (Page 113)

Reference MVI56E-MNETR ♦ ControlLogix Platform
User Manual Modbus TCP/IP Interface Module with Reduced Data Block
ProSoft Technology, Inc.
Page 113 of 153
August 31, 2009
Formatted Pass-Through Response (Write Block)
Offset Description Length
0 9956, 9957, 9958, 9960 or 9961 1
1 to 41 Spare data area 41
Formatted Pass-Through Response (Write Block)
Offset Description Length
0 9959 1
1 to 41 Spare data area 41
Formatted Pass-Through Response (Write Block)
Offset Description Length
0 9970 1
1 to 41 Spare data area 41
5.2.4 Data Flow between MVI56E-MNETR Module and ControlLogix
Processor
The following topics describe the flow of data between the two pieces of
hardware (ControlLogix processor and MVI56E-MNETR module) and other
nodes on the Modbus TCP/IP network under the module’s different operating
modes. The module contains both servers and a client. The servers accept
TCP/IP connections on service ports 502 (MBAP) (10 servers) and 2000 (MNET)
(10 servers). The client can generate either MBAP or MNET requests dependent
on the service port selected in the command.
To Processor
DATABASE
To Module
ControlLogix
Processor
MVI56-
MNETR
Module
MODBUS/TCP
Network
Output from Module
Input from Network
The following topics discuss the operation of the server and client drivers.