Prosoft-technology MVI46-DFCM Manual de usuario descargar pdf (Pagina 61)

Reference MVI46-DFCM ♦ SLC Platform

DF1 Communication Module

ProSoft Technology, Inc. Page 61 of 103

October 20, 2008

Command Control Block

Command control blocks place commands in the command list into the

command queue. Each port has a command queue of up to 100 commands. This

module services commands in the queue before the master command list. This

gives high priority to commands in the queue. Commands placed in the queue

through this mechanism must be defined in the master command list. Under

normal command list execution, the module will only execute commands with the

Enable parameter set to one or two. If the value is set to zero, the command is

skipped. Commands may be placed in the command list with an Enable

parameter set to zero. These commands can then be executed using the

command control blocks. One to six commands can be placed in the command

queue with a single request. The format of the block is shown in the following

table.

Event Command

Event command control blocks send DF1 commands directly from the ladder

logic to one of the master ports. The format for these blocks is displayed below:

M1 Offset Description Length

7800 1000 or 2000 1

7801 Internal DB Address 1

7802 Point Count 1

7803 Swap Code 1

7804 Node Address 1

7805 Function Code 1

7806 Parameter #1 1

7807 Parameter #2 1

7808 Parameter #3 1

7809 Parameter #4 1

The block number defines the DF1 port to be considered. Block 1000 commands

are directed to Port 1, and block 2000 commands are directed to Port 2. The

parameters passed with the block construct the command. The Internal DB

Address parameter specifies the module's database location to associate with

the command. The Point Count parameter defines the number of registers for

the command. The Swap Code changes the word or byte order. The Node

Address parameter defines the device on the DF1 network to consider. The

Function Code parameter is one of those defined in the ProSoft DF1 Command

Set documentation. The parameter fields in the block should be completed as

required by the selected function code. Each command has its own set of

parameters. When the block is received, the module will process it and place the

command in the command queue. The module will respond to each event

command block with a read block with the following format:

M0 Offset Description Length

0 1000 or 2000 1

1 0=Fail, 1=Success 1

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 102 103

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