examples

Author: Sinclair81

examples/async.js

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+const snap7 = require("napi-snap7");
+
+const client = new snap7.S7Client();
+
+const time = (ms) => console.log("| Execution time : %d ms", ms);
+
+const res_p = client.SetConnectionParams("192.168.57.12", 0x2000, 0x2100);
+
+const res_c = client.Connect();
+
+// Read out the outputs Q1 - Q8 of a LOGO 0BA8
+//            DB number (always 0 for LOGO!s)
+//            |    Offset to start
+//            |    |   Size to read (bytes)
+//            |    |   |
+client.DBRead(0, 1064, 1, (err, data) => {
+  if (err) return console.log(client.ErrorText(err));
+  console.log("Data", data);
+  time(client.ExecTime());
+  client.Disconnect();
+});
+
+/* OR */
+
+// Write a 1 in the bit of the VB address V300.5
+const buffer = Buffer.from([0b00100000]);
+//             DB number (always 0 for LOGO!s)
+//             |   Offset to start
+//             |   |   Size to write (bytes)
+//             |   |   |     User buffer
+//             |   |   |     |
+client.DBWrite(0, 300, 1, buffer, (err, data) => {
+  if (err) return console.log(client.ErrorText(err));
+  console.log("Data", data);
+  time(client.ExecTime());
+  client.Disconnect();
+});

examples/async_LOGO.js

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+const snap7 = require("napi-snap7");
+
+const client = new snap7.S7Client();
+
+const time = (ms) => console.log("| Execution time : %d ms", ms);
+
+const res = client.ConnectTo("192.168.57.12", 0, 1);
+
+// Reading 100 bytes from DB 510 starts at 0
+//                Area identifier (0x84 - S7AreaDB)
+//                |    DB number if area = S7AreaDB, otherwise ignored
+//                |    |   Offset to start
+//                |    |   |   Amount of words to read
+//                |    |   |   |     Word size (0x02 - Byte (8 bit))
+//                |    |   |   |     |
+client.ReadArea(0x84, 510, 0, 100, 0x02, (err, data) => {
+  if (err) return console.log(client.ErrorText(err));
+  console.log("Data", data);
+  time(client.ExecTime());
+  client.Disconnect();
+});
+
+/* OR */
+
+// Write 42 to address 0 of DB 510
+const buffer = Buffer.from([42]);
+//                 Area identifier (0x84 - S7AreaDB)
+//                 |    DB number if area = S7AreaDB, otherwise ignored
+//                 |    |   Offset to start
+//                 |    |   |  Amount of words to write
+//                 |    |   |  |    Word size (0x02 - Byte (8 bit))
+//                 |    |   |  |    |      User buffer
+//                 |    |   |  |    |      |
+client.WriteArea(0x84, 510, 0, 1, 0x02, buffer, (err, data) => {
+  if (err) return console.log(client.ErrorText(err));
+  console.log("Data", data);
+  time(client.ExecTime());
+  client.Disconnect();
+});

examples/async_S7.js

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+const snap7 = require('napi-snap7')
+
+const client = new snap7.S7Client()
+
+const time = (ms) => console.log('| Execution time : %d ms', ms)
+
+const res_p = client.SetConnectionParams("192.168.57.12", 0x2000, 0x2100);
+
+const res_c = client.Connect();
+console.log('ConnectTo', res_c)
+time(client.ExecTime())
+console.log('Connected', client.GetConnected())
+
+// Read out the outputs Q1 - Q8 of a LOGO 0BA8
+//                               DB number (always 0 for LOGO!s)
+//                               |    Offset to start
+//                               |    |   Size to read (bytes)
+//                               |    |   |
+const data_r = client.DBReadSync(0, 1064, 1)
+console.log('Data', data_r)
+time(client.ExecTime())
+
+// Write a 1 in the bit of the VB address V300.5
+const buffer = Buffer.from([0b00100000]);
+//                                DB number (always 0 for LOGO!s)
+//                                |   Offset to start
+//                                |   |   Size to write (bytes)
+//                                |   |   |     User buffer
+//                                |   |   |     |
+const data_w = client.DBWriteSync(0, 300, 1, buffer)
+
+client.Disconnect()

examples/sync.js

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+const snap7 = require('napi-snap7')
+
+const client = new snap7.S7Client()
+
+const time = (ms) => console.log('| Execution time : %d ms', ms)
+
+const res = client.ConnectTo('192.168.20.55', 0, 1)
+console.log('ConnectTo', res)
+time(client.ExecTime())
+console.log('Connected', client.GetConnected())
+
+// Reading 20 words from DB 510 starts at 0
+//                                   Area identifier (0x84 - S7AreaDB)
+//                                   |    DB number if area = S7AreaDB, otherwise ignored
+//                                   |    |   Offset to start
+//                                   |    |   |  Amount of words to read
+//                                   |    |   |  |     Word size (0x04 - Word (16 bit))
+//                                   |    |   |  |     |
+const data_r = client.ReadAreaSync(0x84, 510, 0, 20, 0x04)
+console.log('Data', data_r)
+time(client.ExecTime())
+
+// Write 42 to address 0 of DB 510
+const buffer = Buffer.from([42]);
+//                                    Area identifier (0x84 - S7AreaDB)
+//                                    |    DB number if area = S7AreaDB, otherwise ignored
+//                                    |    |   Offset to start
+//                                    |    |   |  Amount of words to write
+//                                    |    |   |  |    Word size (0x02 - Byte (8 bit))
+//                                    |    |   |  |    |      User buffer
+//                                    |    |   |  |    |      |
+const data_w = client.WriteAreaSync(0x84, 510, 0, 1, 0x02, buffer)
+console.log('Data', data_w)
+time(client.ExecTime())
+
+client.Disconnect()