ProSoft Technology MVI46-DFNT - Manual (Page 72)

Reference MVI46-DFNT ♦ SLC Platform
User Manual EtherNet/IP Client/Server Communication Module
Page 72 of 177 ProSoft Technology, Inc.
October 12, 2010
4.2.2 Module Control Blocks (4000 to 4999)
As discussed in the previous section, range 4000 to 4999 in the M1 file controls
the module in order to perform specific tasks. These tasks are described in the
following topics. Word 4000 contains the block ID that identifies the block to the
MVI46-DFNT module. The block structure, which is different for each block, is
shown in the following topics.
Status Data Request
When the user wants to read the module’s general error and status data to the
SLC, it must make a special request using the command control area. The
following tables lists the two values recognized by the module in register 4000 to
request the data:
Control Code Content Description
250 General Status data for the module, client and pass-through server
251 DFNT Servers Status data for each of the 5 DFNT servers
Refer to MVI46-DFNT Status Data Definition (page 86) for a complete listing of
the data returned for the two status blocks.
Initialize Output Data
When the module performs a restart operation, it requests output data from the
processor to initialize the module’s output data. This mode is selected using the
Initialize Output Data parameter in the configuration file. This facility can be
used to bring the module to a known state after the restart operation. The
structure of the block used to request the data is shown in the following table.
Offset Description / Value Length
4000 1000 1
The command control value of 1000 is placed in register 4000 of the M1 file to
indicate that the module is requesting initialization of the M1 data file. Ladder
logic in the processor must recognize this command and place the correct
information in the M1file. After the data transfer is complete, the ladder logic
should place a value of 1001 in register 4000 of the module’s M1 file. The format
of the returned write block is shown in the following table.
Offset Description / Value Length
4000 1001 1