Prosoft-technology MVI71-MNET Manual do Utilizador descarregar pdf (Página 95)

Reference MVI71-MNET ♦ PLC Platform

User Manual Modbus TCP/IP Interface Module

ProSoft Technology, Inc. Page 95 of 109

June 23, 2009

Note: Functions 5, 6, 15, and 16 are the only messages (other than Loopback Diagnostic Test) that

will be recognized as valid for broadcast.

The following example forces 10 coils starting at address 20 (13 HEX). The two

data fields, CD =1100 and 00 = 0000 000, indicate that coils 27, 26, 23, 22, and

20 are to be forced on.

Adr Func Hi Add Lo Add

Quantity Byte

Cnt

Data Coil Status

20 to 27

Data Coil Status

28 to 29

Error Check

Field

11 0F 00 13 00 0A 02 CD 00 CRC

Response

The normal response will be an echo of the Slave address, function code,

starting address, and quantity of coils forced.

Adr Func Hi Addr Lo Addr Quantity Error Check Field

11 0F 00 13 00 0A CRC

The writing of coils via Modbus function 15 will be accomplished regardless of

whether the addressed coils are disabled or not.

Coils that are unprogrammed in the controller logic program are not automatically

cleared upon power up. Thus, if such a coil is set ON by function code 15 and

(even months later) an output is connected to that coil, the output will be hot.

5.7.9 Preset Multiple Registers (Function Code 16)

Query

Holding registers existing within the controller can have their contents changed

by this message (a maximum of 60 registers). However, because the controller is

actively scanning, it also can alter the content of any holding register at any time.

The values are provided in binary up to the maximum capacity of the controller

(16-bit for the 184/384 and 584); unused high order bits must be set to zero.

When specified registers with contents specified.

Note: Function codes 5, 6, 15, and 16 are the only messages that will be recognized as valid for

broadcast.

Adr Func

Add

Lo Add Quantity

Byte

Cnt

Data

Error Check

Field

11 10 00 87 00 02 04 00 0A 01 02 CRC

Response

The normal response to a function 16 query is to echo the address, function

code, starting address and number of registers to be loaded.

Adr Func Hi Addr Lo Addr Quantity Error Check Field

11 10 00 87 00 02 56

1 2 ... 90 91 92 93 94 95 96 97 98 99 100 ... 108 109

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