Prosoft-technology MVI69E-MBTCP Uživatelský manuál stáhnout pdf (Strana 52)

Configuring the MVI69E-MBTCP Using PCB MVI69E-MBTCP ♦ CompactLogix Platform

User Manual Modbus TCP/IP Enhanced Communication Module

Page 52 of 150 ProSoft Technology, Inc.

May 20, 2015

Parameter

Value

Description

Enable

Disable, Enable,

Conditional,

Bit/Word Override,

Float Override

Specifies whether the command is executed and under what

conditions.

DISABLE (0) = The command is disabled and is not executed in the

normal polling sequence.

ENABLE (1) = The command is executed each scan of the command

list if the Poll Interval (see below) is set to zero. If the Poll Interval is

set to a nonzero value, the command is executed when the interval

timer expires.

CONDITIONAL (2) = For write commands only. The command executes

only if the internal data associated with the command changes.

BIT/WORD OVERRIDE (3) = For read commands only. If a command

error occurs, the module overrides the associated database area with

the Override Value Upon Error parameter value.

FLOAT OVERRIDE (4) = For read commands only. If a command error

occurs, the module overrides the associated database area (2x word

count) with the Override Value Upon Error parameter value.

Internal Address

0 to 9999 (word-

level)

0 to 65535 (bit-level)

Specifies the module’s internal database register to be associated

with the command. Allowable range is 0 to 9999 for Modbus Function

Codes 3, 4, 6, or 16, and 0 to 65535 for Modbus Function Codes 1, 2,

5, or 15.

If the command is a read function, the data read from the server

device is stored beginning at the module’s internal database register

value entered in this field. This register value must be in the Read

Data area of the module’s memory, defined by the Read Register

Start and Read Register Count parameters in the Module section.

If the command is a write function, the data to be written to the server

device is sourced beginning from the module’s internal database

area of the module’s memory, defined by the Write Register Start and

Write Register Count parameters in the Module section.

Poll Interval

0 to 65535 seconds

Specifies the minimum interval between executions of continuous

commands (Enable code = 1).

Example: If you set the value to 10, the command executes no more

frequently than once every 10 seconds. When the command reaches

the top of the command queue and 10 seconds has not elapsed, it is

skipped until the poll interval has expired.

1 to 125 (words) or

1 to 800 (coils)

Specifies the number of registers or digital points to be associated

with the command. Modbus Function Codes 5 and 6 ignore this field

as they only apply to a single data point.

For Modbus Function Codes 1, 2, and 15, this parameter sets the

number of single bit digital points (inputs or coils) to be associated

with the command.

For Modbus Function Codes 3, 4, and 16, this parameter sets the

number of 16-bit registers to be associated with the command.

Swap Code

No Change,

Word Swap,

Word and Byte

Swap,

Byte Swap

Defines if the data received from the Modbus server is to be ordered

differently than 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 storing these data types in server

devices. You can set this parameter to order the register data

received in an order useful by other applications.

NO CHANGE = No change is made in the byte ordering (ABCD =

ABCD)

WORD SWAP = The words are swapped (ABCD= CDAB)

WORD AND BYTE SWAP = The words are swapped, then the bytes in

each word are swapped (ABCD=DCBA)

BYTE SWAP = The bytes in each word are swapped (ABCD=BADC)

Note: Each pair of characters is a byte (example: AB and CD). Two

pairs of characters is a 16-bit register (example: ABCD).

1 2 ... 47 48 49 50 51 52 53 54 55 56 57 ... 149 150

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