nestjs S71200 连接， 单个地址读写， 多个地址读写， 断连重连

要实现 NestJS 和 S7-1200 的连接，可以使用 s7comm-js 库，它支持与 S7-300、S7-400、S7-1200 和 S7-1500 进行通信。以下是如何使用该库进行单个地址读写、多个地址读写和断连重连的示例：

1. 单个地址读写

import { S7Client } from 's7comm-js';

async function readWriteSingleAddress() {
  const client = new S7Client({
    name: 'PLC',
    host: '192.168.0.1',
    rack: 0,
    slot: 1,
  });

  try {
    await client.connect();
    const data = await client.read('DB1.DBX0.0');
    console.log('Read data:', data);
    await client.write('DB1.DBX0.0', true);
    console.log('Write data successful');
  } catch (error) {
    console.error('Error:', error);
  } finally {
    client.disconnect();
  }
}

readWriteSingleAddress();

2. 多个地址读写

import { S7Client } from 's7comm-js';

async function readWriteMultipleAddresses() {
  const client = new S7Client({
    name: 'PLC',
    host: '192.168.0.1',
    rack: 0,
    slot: 1,
  });

  try {
    await client.connect();
    const data = await client.readMany([
      'DB1.DBX0.0',
      'DB1.DBX0.1',
      'DB1.DBW2',
    ]);
    console.log('Read data:', data);
    await client.writeMany([
      { address: 'DB1.DBX0.0', value: true },
      { address: 'DB1.DBX0.1', value: false },
      { address: 'DB1.DBW2', value: 1234 },
    ]);
    console.log('Write data successful');
  } catch (error) {
    console.error('Error:', error);
  } finally {
    client.disconnect();
  }
}

readWriteMultipleAddresses();

3. 断连重连

import { S7Client } from 's7comm-js';

async function reconnect() {
  const client = new S7Client({
    name: 'PLC',
    host: '192.168.0.1',
    rack: 0,
    slot: 1,
  });

  try {
    await client.connect();
    console.log('Connected to PLC');
    await client.disconnect();
    console.log('Disconnected from PLC');
    await client.connect();
    console.log('Reconnected to PLC');
  } catch (error) {
    console.error('Error:', error);
  } finally {
    client.disconnect();
  }
}

reconnect();

以上是基本示例，您需要根据自己的实际需求进行修改和调整。