ProSoft Technology MVI69-DFCM - Manual (Page 94)

MVI69-DFCM ♦ CompactLogix or MicroLogix Platform Reference
DF1 Interface Module
Page 94 of 117 ProSoft Technology, Inc.
November 3, 2008
Each command issued from the DF1 master contains a field that indicates the
location in the virtual database to be associated with the command. Care must
be taken when designing a system to be sure the read and write data regions for
the database do not overlap for a single device. The read area of one device can
overlap the write section of another device to transfer the data from one slave
device to another.
5.8.2 Command Function Codes
This section describes DFCM commands to be configured by the user.
Module Information Data Device Information Data
1 2 3 4 5 6 7 8 9 10 11
Enable
Code
Internal
Address Poll
Interval
Time Count Swap
Code
Node
Address Function
Code Function Parameters
Function Code #1 - Protected Write (Basic Command Set)
Column Parameter Description Parameter
1 Enable/Type Word 0=Disabled, 1=Continuous and 2=Conditional.
2 Virtual Database Address This parameter defines the database address of the first
data point to be associated with the command.
3 Poll Interval Minimum time in tenths of a second to wait before polling
with this command.
4 Count Number of data word values to be considered by the
function.
5 Swap Type Code Swap type code for command: 0=None, 1=Swap words,
2=Swap words & bytes and 3=swap bytes in each word.
6 Node Address Address of unit to reach on the data highway.
7 Function Code = 1 Protected Write Function
8 Word Address Word address where to start the write operation. P1
9 to 11 Not Used These fields are not used by the command. Values
entered in these columns will be ignored. P2 to P4
This function writes one or more words of data into a limited area of the slave
device. This function should work on the following devices: 1774-PLC, PLC-2,
PLC-3, PLC-5 and PLC-5/250.
Function Code #2 - Unprotected Read (Basic Command Set)
Column Parameter Description Parameter
1 Enable/Type Word 0=Disabled and 1=Continuous.
2 Virtual Database Address This parameter defines the database address of the first
data point to be associated with the command.
3 Poll Interval Minimum time in tenths of a second to wait before
polling with this command.
4 Count Number of data word values to be considered by the
function.
5 Swap Type Code Swap type code for command: 0=None, 1=Swap words,
2=Swap words & bytes and 3=swap bytes in each word.