ProSoft Technology ControlLogix MVI56E-SMGC User Manual page 88

MVI56E-SMGC ♦ ControlLogix™ Platform
Enhanced FMC722 TPU General Communication Module
5.2.1.8 Command Data Blocks
Command data blocks are utilized by the SMGC protocol to perform specific functions or
to indicate status of the messaging. For a complete discussion of each command data
block, refer to the protocol specification. A discussion of each function is given in the
following topics:
Configuration Request
This data block requests the configuration information from a single or all configured
tags in the server. The format of the message to request configuration information is as
follows (write block to the module):
Word Offset
4 to 5
6 to 7
If a specific tag is required, enter its tag index into the tag index member of the block.
The module will automatically issue this request after all the tag indexes are set by the
module. This process occurs each time the module makes a TCP/IP connection to the
server.
Ping Request/Response
This data block is used to ping the server and have the server respond with the same
message sent. This message can be sent to check that the server is still connected to
the client and to keep the TCP/IP connection open. The format of the request message is
as follows (write block to the module):
Word Offset
4 to 5
6 to 7
The server will respond with a block with the following format (read block from the
module):
Word Offset
2 to 3
4 to 5
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Byte Count Data Type
4 DINT
4 DINT
Byte Count Data Type
4 DINT
4 DINT
Byte Count Data Type
4 DINT
4 DINT
Description
Configuration data block code 0x00000101
Tag Index (0xFFFFFFFF=all tags)
Description
Ping data block code (0x00000102)
Tag Index (unused)
Description
Ping data block code (0x00000102)
Tag Index (unused)
Reference
User Manual
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