Modbus tcp linux server

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An example for a Modbus TCP server written in Python with pyModbusTCP

Johannes4Linux/Simple-ModbusTCP-Server

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README.md

This is the file I have used for my video about creating a Modbus TCP server in Python. Here is the link to my video.

The file Simple_ModbusServer.py contains the code for a simple Modbus Server with the following register description:

Holding Register Addr.	Description
0	Server writes a random value to it every 500 ms
1	Server monitors this register for changes. If the value is changed by the client, the server will print out the new value

To run the script, you need to have pyModbusTCP installed on your machine. To install it, you can use:

sudo pip install pyModbusTCP 

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An example for a Modbus TCP server written in Python with pyModbusTCP

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Modbus TCP Server Docker¶

The Modbus TCP Server is a simple Modbus server for debugging and simulation.

Docker¶

docker run --name modbus-server -p 5020:5020 -d oitc/modbus-server docker run --name modbus-server -p 5020:5020 -d -v $PWD/server_config.json:/server_config.json oitc/modbus-server -f /server_config.json

Docker Compose¶

modbus-server: container_name: modbus-server image: oitc/modbus-server restart: always command: -f /server_config.json ports: - 5020:5020 volumes: - ./server.json:/server_config.json:ro 

Configuration¶

An example can be found in the GIT repo: abb_coretec_example.json

Default configuration¶

 "server":  "listenerAddress": "0.0.0.0", "listenerPort": 5020, "tlsParams":  "description": "path to certificate and private key to enable tls", "privateKey": null, "certificate": null >, "logging":  "format": "%(asctime)-15s %(threadName)-15s %(levelname)-8s %(module)-15s:%(lineno)-8s %(message)s", "logLevel": "DEBUG" > >, "registers":  "description": "initial values for the register types", "zeroMode": false, "initializeUndefinedRegisters": true, "discreteInput": <>, "coils": <>, "holdingRegister": <>, "inputRegister": <> > > 

Predefined registers¶

 "server":  "listenerAddress": "0.0.0.0", "listenerPort": 5020, "tlsParams":  "description": "path to certificate and private key to enable tls", "privateKey": null, "certificate": null >, "logging":  "format": "%(asctime)-15s %(threadName)-15s %(levelname)-8s %(module)-15s:%(lineno)-8s %(message)s", "logLevel": "DEBUG" > >, "registers":  "description": "initial values for the register types", "zeroMode": false, "initializeUndefinedRegisters": true, "discreteInput": <>, "coils": <>, "holdingRegister":  "123": "0xAABB", "246": "0x0101" >, "inputRegister": <> > > 

References¶

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Русские Блоги

В рабочем проекте робот должен выполнять функцию управления питанием. Он поставляется с перезаряжаемыми контактами для контакта с заряженной батареей. Конкретные параметры не показаны. Код должен завершать связь с ПЛК Siemens через беспроводную сеть для управления открытием и закрытием зарядной комнаты. И управляя открытием и закрытием реле в точке зарядки, протокол modbus-tcp , Так что найдите полезную библиотеку с открытым исходным кодом онлайн- libmodbus , Запишите простой процесс использования.
Адрес загрузки:
download Выберите долгосрочную стабильную версию v3.0.6

Эта статья состоит из следующих разделов:

Исходная установка

После загрузки почтового файла в /home В каталоге извлеките:

tar -zxvf libmodbus-3.0.6.tar.gz

вводить libmodbus-3.0.6 Содержание:
cd libmodbus-3.0.6

Скомпилируйте и установите:
make && make install

Тест и использование

тест

 modbus_t *mb; uint16_t tab_reg[32]; mb = modbus_new_tcp("127.0.0.1", 1502); modbus_connect(mb); /* Read 5 registers from the address 0 */ modbus_read_registers(mb, 0, 5, tab_reg); modbus_close(mb); modbus_free(mb); 

Проверьте связь по протоколу modbus-tcp, код использует локальный адрес обратной связи, порт 1502:
Войдите в каталог тестов, откройте терминал и запустите программу сервера:
./unit-test-server tcp
Откройте другой терминал в каталоге и запустите клиентскую программу:
./unit-test-client tcp
Он напечатает много информации при запуске.

использование

И вам также нужно упростить пример кода и изменить IP-адрес и порт при необходимости:
в libmodbus-3.0.6 Создайте новый каталог mytest в каталоге.
mkdir mytest

Скопируйте необходимые заголовочные файлы в каталог src В:
cp modbus.h modbus-rtu.h modbus-tcp.h ../mytest

Войдите в каталог:
cd myteast

Создайте свой собственный код main.c Следующим образом:

#include #include #include #include #include #include #include const uint16_t UT_INPUT_REGISTERS_ADDRESS = 0x1; const uint16_t UT_BITS_ADDRESS = 0x04; const uint16_t UT_INPUT_REGISTERS_NB = 0xA; const uint16_t UT_INPUT_REGISTERS_TAB[] =  0x000A >; int main(int argc, char const *argv[])  int nb = 0x25; int rc = 0; modbus_t *ctx; uint8_t *tab_rp_bits; tab_rp_bits = (uint8_t *) malloc(nb * sizeof(uint8_t)); memset(tab_rp_bits, 0, nb * sizeof(uint8_t)); ctx = modbus_new_tcp("192.168.1.120", 502); if(ctx == NULL)  fprintf(stderr, "Unable to allocate libmodbus context\n"); return -1; > if(modbus_connect(ctx) == -1)  fprintf(stderr, "Connection failed: %s\n", modbus_strerror(errno)); modbus_free(ctx); return -1; > while(1)  rc = modbus_write_bit(ctx, UT_BITS_ADDRESS, 1); if (rc != 1)  printf("FAILED (nb points %d)\n", rc); > rc = modbus_read_bits(ctx, UT_BITS_ADDRESS, 1, tab_rp_bits); printf("modbus_read_bits 1 \n modbus_read_bits: \n"); if (rc != 1)  printf("FAILED (nb points %d)\n", rc); > printf("tab_rp_bits [0] is %d\n",tab_rp_bits[0]); memset(tab_rp_bits, 0, nb * sizeof(uint8_t)); sleep(1); rc = modbus_write_bit(ctx, UT_BITS_ADDRESS, 0); if (rc != 1)  printf("FAILED (nb points %d)\n", rc); > rc = modbus_read_bits(ctx, UT_BITS_ADDRESS, 1, tab_rp_bits); printf("modbus_read_bits 0 \n modbus_read_bits: \n"); if (rc != 1)  printf("FAILED (nb points %d)\n", rc); > printf("tab_rp_bits [0] is %d\n",tab_rp_bits[0]); sleep(1); > modbus_close(ctx); modbus_free(ctx); return 0; > 

ip 192.168.1.120
порт 502
Функция вышеприведенного кода: управление адресом чтения и записи, который должен быть 0x04 бит coil status Состояние заставляет его постоянно изменяться, и производительность на ПЛК мигает индикатором.

Обобщение:
cc -o main main.c -lmodbus -I ./
Если ссылка не работает, но в ошибке отсутствует файл so, найдите соответствующий файл so и скопируйте его в /usr/local/lib Каталог и запустить ldonfig 。

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adpuckett87/modbus-client-server

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README.md

• modbus-client is a standalone command line Modbus TCP client
• modbus-server is a Modbus TCP server that uses mysql to store register values

modbus-client ip_address slave_id r reg_type address [num_reg format] 

modbus-client ip_address slave_id w reg_type address value [format] 

• a — floating point abcd
• b — floating point badc
• c — floating point cdab
• d — floating point dcba
• (s)1 — 16-bit register. Optionally signed. Default.
• (s)3 — 32-bit register. Optionally signed.
• (s)6 — 64-bit register. Optionally signed.
• (s)k — 32-bit Mod10k. Optionally signed.
• (s)l — 48-bit Mod10k. Optionally signed.
• (s)m — 64-bit Mod10k. Optionally signed.

From libmodbus documentation:

chmod +x ./autogen.sh ./autogen.sh ./configure make install 

May need to do this depending on distribution

cp src/.libs/libmodbus.so* /usr/lib/ ln -s -f /usr/lib/libmodbus.so.5.1.0 /usr/lib/libmodbus.so.5 ln -s -f /usr/lib/libmodbus.so.5.1.0 /usr/lib/libmodbus.so 

gcc modbus-client.c -o modbus-client `pkg-config --libs --cflags libmodbus` 

gcc inih/ini.c modbus-server.c -o modbus-server -std=gnu99 `mysql_config --cflags --libs` `pkg-config --libs --cflags libmodbus` cp modbus-server /usr/bin/ 

Make sure mysql is installed with libmysqlclient-dev

Choose a database and create the following table

CREATE TABLE IF NOT EXISTS `modbusServer` ( `id` int(11) NOT NULL AUTO_INCREMENT, `regType` int(11) NOT NULL, `address` int(11) NOT NULL, `val` int(11) NOT NULL DEFAULT '0', `modifiedCount` int(11) NOT NULL DEFAULT '0', `updated` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, PRIMARY KEY (`id`), KEY (`regType`), KEY (`address`), UNIQUE KEY (`regType`, `address`) ) ENGINE=InnoDB; 

Copy ini to /etc and fill in mysql information. Mysql user should have read/write access

Optionally install modbus-server as a service

Install runit and execute the following commands

mkdir -p /etc/sv/modbus-server/log mkdir /var/log/modbus-server cat > /etc/sv/modbus-server/run &1 EOM cat > /etc/sv/modbus-server/log/run  

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