TVZ2019 / Mbed 2 deprecated MODBUS_TCP-IP

Aplikacijski kod

Dependencies:   mbed

U prikazanom primjeru izvedena je remote ModBus TCP/IP komunikacija. Generalni opis konfiguracije: U ovom radu je korištena oprema prizvođača Mikortik te mikrokontroler mbed NXP LPC1768. Libery za ethernet odnosno Modbus TCP/IP sam skino sam stranice mbeda te sam ga modificirao kako bi odgovarao željenoj aplikaciji. (https://os.mbed.com/users/paleskyjp/code/ModbusTCP_Modified/) Preko mrežne opreme izeveo sam SSTP VPN koji spaja lokalne subnete iz uređaja "mbed LOCAL" i uređaja "mbed LAPTOP" u jedan jedinstveni te omogućava nesmetanu komunikaciju između uređaja povezanih u lokalnim subnetima. Moguće se također spojiti direktno preko ethernet kabela u uređaj, ali u ovom primjeru laptop je spojen na WIFI mrežu nazvanzu "MBED TVZ" te preko nje komunicira sa mikrokontrolerom koji je kabelom spojem u mrežni uređaj naziva "mbed LOCAL". Riječ remote u ovom primjeru pokazuje da su dva uređaja "mbed LOCAL" i "mbed LAPTOP" preko WIFI-ja spojeni na 2 različita hosta (mobiteli pored njih) te je otvoren VPN kanal između njih. Na uređajima je također podešen DHCP koji dodijeljuje adrese uređajima koji se pokušavaju spojiti na njih, tako i mikrokontroleru. Lokalni subnet nije pušten na internet te mbed nije direktno izložen internetu, što pridonosi sigurnosnom aspektu komunikacije. Za tesitranje komunikacije dovoljno je koristit osnovne alate koji dolaze sa svakim windows-ima, naredba ping (na videu doljnji desni dio ekrana, dok je mbed bio ugašen vidljivo je da ne prolazi komunikacija, nakon što se upalio i spojio na mrežu komunikacija se uspostavila te je vidljivo kako konstantno vraća odgovor) Alat korišten za upis podataka u registre je Modbus Master koji podržava TCP/IP. Svakako je moguće koristiti i druge aplikacije ili druge uređaje koji podržavaju ovaj tip komunikacije. Primjerice PLC, drugi mbed, neko drugo računalo,... Aplikacija sama po sebi nije nešto pretjerano komplicirana ali put samog paketa od Modbus master-a do samog Modbus slave-a nije tako jednostavan. Aplikacija se odnosi na dio ukoliko na nulti registar bilo koje adresnog polja Modbus master pošalje vrijednost veću od 5 konstantno svijetli LED2 izvedena na samoj ploćici mbeda, te ukoliko dođe vrijednos manja od 5 da ugasi LED2. To je samo demostracija rada komunikacije. U ovoj konfiguraciji moguće je bilo gdje odnjeti mikortik i mbed te ga spojiti na WIFI koji ima propust prema internetu te se sa drugim mikrotikom povezati sa mbed-om i nesmetano komunicirati.

ModBus/mbfuncinput.cpp@0:62be54b8975d, 2012-03-13 (annotated)

Committer:
paleskyjp
Date:
Tue Mar 13 09:11:49 2012 +0000
Revision:
0:62be54b8975d
The first modification of ModbusTCP

Who changed what in which revision?

UserRevisionLine numberNew contents of line
paleskyjp 0:62be54b8975d 1 /*
paleskyjp 0:62be54b8975d 2 * FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU.
paleskyjp 0:62be54b8975d 3 * Copyright (c) 2006 Christian Walter <wolti@sil.at>
paleskyjp 0:62be54b8975d 4 * All rights reserved.
paleskyjp 0:62be54b8975d 5 *
paleskyjp 0:62be54b8975d 6 * Redistribution and use in source and binary forms, with or without
paleskyjp 0:62be54b8975d 7 * modification, are permitted provided that the following conditions
paleskyjp 0:62be54b8975d 8 * are met:
paleskyjp 0:62be54b8975d 9 * 1. Redistributions of source code must retain the above copyright
paleskyjp 0:62be54b8975d 10 * notice, this list of conditions and the following disclaimer.
paleskyjp 0:62be54b8975d 11 * 2. Redistributions in binary form must reproduce the above copyright
paleskyjp 0:62be54b8975d 12 * notice, this list of conditions and the following disclaimer in the
paleskyjp 0:62be54b8975d 13 * documentation and/or other materials provided with the distribution.
paleskyjp 0:62be54b8975d 14 * 3. The name of the author may not be used to endorse or promote products
paleskyjp 0:62be54b8975d 15 * derived from this software without specific prior written permission.
paleskyjp 0:62be54b8975d 16 *
paleskyjp 0:62be54b8975d 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
paleskyjp 0:62be54b8975d 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
paleskyjp 0:62be54b8975d 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
paleskyjp 0:62be54b8975d 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
paleskyjp 0:62be54b8975d 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
paleskyjp 0:62be54b8975d 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
paleskyjp 0:62be54b8975d 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
paleskyjp 0:62be54b8975d 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
paleskyjp 0:62be54b8975d 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
paleskyjp 0:62be54b8975d 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
paleskyjp 0:62be54b8975d 27 *
paleskyjp 0:62be54b8975d 28 * File: $Id: mbfuncinput.c,v 1.10 2007/09/12 10:15:56 wolti Exp $
paleskyjp 0:62be54b8975d 29 */
paleskyjp 0:62be54b8975d 30
paleskyjp 0:62be54b8975d 31 /* ----------------------- System includes ----------------------------------*/
paleskyjp 0:62be54b8975d 32 #include "stdlib.h"
paleskyjp 0:62be54b8975d 33 #include "string.h"
paleskyjp 0:62be54b8975d 34
paleskyjp 0:62be54b8975d 35 /* ----------------------- Platform includes --------------------------------*/
paleskyjp 0:62be54b8975d 36 #include "port.h"
paleskyjp 0:62be54b8975d 37
paleskyjp 0:62be54b8975d 38 /* ----------------------- Modbus includes ----------------------------------*/
paleskyjp 0:62be54b8975d 39 #include "mb.h"
paleskyjp 0:62be54b8975d 40 #include "mbframe.h"
paleskyjp 0:62be54b8975d 41 #include "mbproto.h"
paleskyjp 0:62be54b8975d 42 #include "mbconfig.h"
paleskyjp 0:62be54b8975d 43
paleskyjp 0:62be54b8975d 44 /* ----------------------- Defines ------------------------------------------*/
paleskyjp 0:62be54b8975d 45 #define MB_PDU_FUNC_READ_ADDR_OFF ( MB_PDU_DATA_OFF )
paleskyjp 0:62be54b8975d 46 #define MB_PDU_FUNC_READ_REGCNT_OFF ( MB_PDU_DATA_OFF + 2 )
paleskyjp 0:62be54b8975d 47 #define MB_PDU_FUNC_READ_SIZE ( 4 )
paleskyjp 0:62be54b8975d 48 #define MB_PDU_FUNC_READ_REGCNT_MAX ( 0x007D )
paleskyjp 0:62be54b8975d 49
paleskyjp 0:62be54b8975d 50 #define MB_PDU_FUNC_READ_RSP_BYTECNT_OFF ( MB_PDU_DATA_OFF )
paleskyjp 0:62be54b8975d 51
paleskyjp 0:62be54b8975d 52 /* ----------------------- Static functions ---------------------------------*/
paleskyjp 0:62be54b8975d 53 eMBException prveMBError2Exception( eMBErrorCode eErrorCode );
paleskyjp 0:62be54b8975d 54
paleskyjp 0:62be54b8975d 55 /* ----------------------- Start implementation -----------------------------*/
paleskyjp 0:62be54b8975d 56 #if MB_FUNC_READ_INPUT_ENABLED > 0
paleskyjp 0:62be54b8975d 57
paleskyjp 0:62be54b8975d 58 eMBException
paleskyjp 0:62be54b8975d 59 eMBFuncReadInputRegister( UCHAR * pucFrame, USHORT * usLen )
paleskyjp 0:62be54b8975d 60 {
paleskyjp 0:62be54b8975d 61 USHORT usRegAddress;
paleskyjp 0:62be54b8975d 62 USHORT usRegCount;
paleskyjp 0:62be54b8975d 63 UCHAR *pucFrameCur;
paleskyjp 0:62be54b8975d 64
paleskyjp 0:62be54b8975d 65 eMBException eStatus = MB_EX_NONE;
paleskyjp 0:62be54b8975d 66 eMBErrorCode eRegStatus;
paleskyjp 0:62be54b8975d 67
paleskyjp 0:62be54b8975d 68 if( *usLen == ( MB_PDU_FUNC_READ_SIZE + MB_PDU_SIZE_MIN ) )
paleskyjp 0:62be54b8975d 69 {
paleskyjp 0:62be54b8975d 70 usRegAddress = ( USHORT )( pucFrame[MB_PDU_FUNC_READ_ADDR_OFF] << 8 );
paleskyjp 0:62be54b8975d 71 usRegAddress |= ( USHORT )( pucFrame[MB_PDU_FUNC_READ_ADDR_OFF + 1] );
paleskyjp 0:62be54b8975d 72 usRegAddress++;
paleskyjp 0:62be54b8975d 73
paleskyjp 0:62be54b8975d 74 usRegCount = ( USHORT )( pucFrame[MB_PDU_FUNC_READ_REGCNT_OFF] << 8 );
paleskyjp 0:62be54b8975d 75 usRegCount |= ( USHORT )( pucFrame[MB_PDU_FUNC_READ_REGCNT_OFF + 1] );
paleskyjp 0:62be54b8975d 76
paleskyjp 0:62be54b8975d 77 /* Check if the number of registers to read is valid. If not
paleskyjp 0:62be54b8975d 78 * return Modbus illegal data value exception.
paleskyjp 0:62be54b8975d 79 */
paleskyjp 0:62be54b8975d 80 if( ( usRegCount >= 1 )
paleskyjp 0:62be54b8975d 81 && ( usRegCount < MB_PDU_FUNC_READ_REGCNT_MAX ) )
paleskyjp 0:62be54b8975d 82 {
paleskyjp 0:62be54b8975d 83 /* Set the current PDU data pointer to the beginning. */
paleskyjp 0:62be54b8975d 84 pucFrameCur = &pucFrame[MB_PDU_FUNC_OFF];
paleskyjp 0:62be54b8975d 85 *usLen = MB_PDU_FUNC_OFF;
paleskyjp 0:62be54b8975d 86
paleskyjp 0:62be54b8975d 87 /* First byte contains the function code. */
paleskyjp 0:62be54b8975d 88 *pucFrameCur++ = MB_FUNC_READ_INPUT_REGISTER;
paleskyjp 0:62be54b8975d 89 *usLen += 1;
paleskyjp 0:62be54b8975d 90
paleskyjp 0:62be54b8975d 91 /* Second byte in the response contain the number of bytes. */
paleskyjp 0:62be54b8975d 92 *pucFrameCur++ = ( UCHAR )( usRegCount * 2 );
paleskyjp 0:62be54b8975d 93 *usLen += 1;
paleskyjp 0:62be54b8975d 94
paleskyjp 0:62be54b8975d 95 eRegStatus = eMBRegInputCB( pucFrameCur, usRegAddress, usRegCount );
paleskyjp 0:62be54b8975d 96
paleskyjp 0:62be54b8975d 97 /* If an error occured convert it into a Modbus exception. */
paleskyjp 0:62be54b8975d 98 if( eRegStatus != MB_ENOERR )
paleskyjp 0:62be54b8975d 99 {
paleskyjp 0:62be54b8975d 100 eStatus = prveMBError2Exception( eRegStatus );
paleskyjp 0:62be54b8975d 101 }
paleskyjp 0:62be54b8975d 102 else
paleskyjp 0:62be54b8975d 103 {
paleskyjp 0:62be54b8975d 104 *usLen += usRegCount * 2;
paleskyjp 0:62be54b8975d 105 }
paleskyjp 0:62be54b8975d 106 }
paleskyjp 0:62be54b8975d 107 else
paleskyjp 0:62be54b8975d 108 {
paleskyjp 0:62be54b8975d 109 eStatus = MB_EX_ILLEGAL_DATA_VALUE;
paleskyjp 0:62be54b8975d 110 }
paleskyjp 0:62be54b8975d 111 }
paleskyjp 0:62be54b8975d 112 else
paleskyjp 0:62be54b8975d 113 {
paleskyjp 0:62be54b8975d 114 /* Can't be a valid read input register request because the length
paleskyjp 0:62be54b8975d 115 * is incorrect. */
paleskyjp 0:62be54b8975d 116 eStatus = MB_EX_ILLEGAL_DATA_VALUE;
paleskyjp 0:62be54b8975d 117 }
paleskyjp 0:62be54b8975d 118 return eStatus;
paleskyjp 0:62be54b8975d 119 }
paleskyjp 0:62be54b8975d 120
paleskyjp 0:62be54b8975d 121 #endif