-
Notifications
You must be signed in to change notification settings - Fork 389
/
hello_world_plc4go_read.go
74 lines (63 loc) · 2.23 KB
/
hello_world_plc4go_read.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package main
import (
"fmt"
"github.com/apache/plc4x/plc4go/pkg/plc4go"
"github.com/apache/plc4x/plc4go/pkg/plc4go/drivers"
"github.com/apache/plc4x/plc4go/pkg/plc4go/model"
)
func main() {
driverManager := plc4go.NewPlcDriverManager()
drivers.RegisterModbusDriver(driverManager)
// Get a connection to a remote PLC
crc := driverManager.GetConnection("modbus:tcp://192.168.23.30")
// Wait for the driver to connect (or not)
connectionResult := <-crc
if connectionResult.Err != nil {
fmt.Printf("error connecting to PLC: %s", connectionResult.Err.Error())
return
}
connection := connectionResult.Connection
// Make sure the connection is closed at the end
defer connection.BlockingClose()
// Prepare a read-request
readRequest, err := connection.ReadRequestBuilder().
AddQuery("field", "holding-register:26:REAL").
Build()
if err != nil {
fmt.Printf("error preparing read-request: %s", connectionResult.Err.Error())
return
}
// Execute a read-request
rrc := readRequest.Execute()
// Wait for the response to finish
rrr := <-rrc
if rrr.Err != nil {
fmt.Printf("error executing read-request: %s", rrr.Err.Error())
return
}
// Do something with the response
if rrr.Response.GetResponseCode("field") != model.PlcResponseCode_OK {
fmt.Printf("error an non-ok return code: %s", rrr.Response.GetResponseCode("field").GetName())
return
}
value := rrr.Response.GetValue("field")
fmt.Printf("Got result %f", value.GetFloat32())
}