ProSoft Technology MVI69-DFCM - Manual (Page 32)

MVI69-DFCM ♦ CompactLogix or MicroLogix Platform Configuring the MVI69-DFCM Module
DF1 Interface Module
Page 32 of 117 ProSoft Technology, Inc.
November 3, 2008
The commands take the following parameters:
Enable: This field defines whether or not the command is to be executed and
under what conditions. A 0 indicates that the command is disabled and will not be
executed in the normal polling sequence. A 1 indicates that the command is
executed each scan of the command list if the Poll Interval Time is set to zero. If
the Poll Interval Time is set, the command is executed when the internal timer
expires. A 2 indicates that the command only executes if the internal data
associated with the command changes. This value is valid for write commands
only.
Internal Address: This field specifies the database address in the module's
internal database to be associated with the command. If the command is not a
read function, the data received in the response message is placed at the
specified location. If the command is a write function, data used in the command
is sourced from the specified data area. Valid values are 0 to 3999.
Poll Interval: This parameter specifies the minimum interval to execute
continuous commands (Enable code of 1). The parameter is entered in 1/10
th
of a
second. Therefore, if a value of .50 is entered for a command, the command
executes no more frequently that every 5 seconds. Valid values are 0 to 65535.
Count: This parameter specifies the number of registers or digital points to be
associated with the command.
Swap Code: This parameter defines if the data received from the server is to be
ordered differently than that received from the server device. This parameter is
helpful when dealing with floating point or other multi-register values, as there is
no standard method of storage of these data types in server devices. This
parameter can be set to order the register data received in an order useful by
other applications. The following defines the values and operations:
Swap Code Description
0 None - No Change is made in the byte ordering (1234 = 1234)
1 Words - The words are swapped (1234=3412)
2 Words & Bytes - The words are swapped then the bytes in each word are
swapped (1234=4321)
3 Bytes - The bytes in each word are swapped (1234=2143)
The words should be swapped only when using an even number of words.
Node Address: The address of the device being addressed by the command.
Function Code: These parameters specify the function to be executed by the
command. Refer to DF1 Command Set For ProSoft Technology Communication
Modules (page 93) for more information on constructing commands for the
module.