Prosoft-technology MVI46-DFCM Manual de usuario descargar pdf (Pagina 81)

Reference MVI46-DFCM ♦ SLC Platform

DF1 Communication Module

ProSoft Technology, Inc. Page 81 of 103

October 20, 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.

5.6.2 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.

6 Node Address Address of unit to reach on the data highway.

7 Function Code = 2 Unprotected Read Function

8 Word Address Word address where to start the read operation. P1

1 2 ... 76 77 78 79 80 81 82 83 84 85 86 ... 102 103

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