Prosoft-technology MVI69E-MBS Instrukcja Użytkownika Pobierz pdf (Strona 132)

Reference MVI69E-MBS ♦ CompactLogix Platform

User Manual Communication Module

Page 132 of 162 ProSoft Technology, Inc.

January 6, 2014

7.4.1 Event Blocks

Blocks 1000 to 1255: Event Port 1

Blocks 2000 to 2255: Event Port 2

Event Command blocks send Modbus commands directly from the ladder logic to

one of the Master ports. The Event Command is added to the high-priority queue

and interrupts normal polling so that this special command can be sent as soon

as possible.

Note: Overusing Event Commands may substantially slow or totally disrupt normal polling. Use

Event Commands sparingly. Event Commands are meant to be used as one-shot commands

triggered by special circumstances or uncommon events.

Blocks 1000 to 1255 or 2000 to 2255: Request from Processor to Module

Offset

Description

Write Block ID: 1000 to 1255 for a Port 1 command or 2000 to 2255 for a Port 2

command. The last 3 digits of the command are used to specify the slave address to

use for the command.

Internal address in the module to be used with the command.

Count parameter that determines the number of digital points or registers to

associate with the command.

Swap type for the data.

Modbus Function Code to be associated with the command.

Modbus address in the slave device to be used in the command.

6 to (n-1)

Spare

Where n = 60, 120, or 240 depending on the Block Transfer Size parameter.

Blocks 1000 to 1255 or 2000 to 2255: Response from Module to Processor

Offset

Description

Read Block ID: 1000 to 1255 or 2000 to 2255 requested by the processor.

Write Block ID: To be used by the processor in its next Write block

Result of the event request. 1 = the command was placed in the command queue; 0

= no room was found in the command queue.

Number of commands in the command queue for the specified port.

4 to (n-1)

Spare

1 2 ... 127 128 129 130 131 132 133 134 135 136 137 ... 161 162

Brak uwag

Prosoft-technology MVI69E-MBS Instrukcja Użytkownika Strona 132