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- Reading, Writing, Subscriptions, Property Access
- Reading Multiple values. Wrong data ?
Reading Multiple values. Wrong data ?
23 Oct 2014 12:02 #2465
by Dirk
Replied by Dirk on topic Reading Multiple values. Wrong data ?
Hi There,
I got it to work. The code i had submitted are only parts so the code i have does compile.
The real confusion was in the line :
String ItemName = "S7:[S7_Connection_1].DB101" + ",WORD" + i.ToString();
it has to be :
String ItemName = "S7:[S7_Connection_1]DB101" + ",WORD" + i.ToString();
There is no dot between the connection name and the item. All works now. Thanks
I got it to work. The code i had submitted are only parts so the code i have does compile.
The real confusion was in the line :
String ItemName = "S7:[S7_Connection_1].DB101" + ",WORD" + i.ToString();
it has to be :
String ItemName = "S7:[S7_Connection_1]DB101" + ",WORD" + i.ToString();
There is no dot between the connection name and the item. All works now. Thanks
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21 Oct 2014 15:55 - 21 Oct 2014 15:56 #2463
by support
Replied by support on topic Reading Multiple values. Wrong data ?
The code you provided does not have a declaration of the 'tags' variable, but I think it won't compile anyway, because either 'tags' is an array and then it would be impossible to assign a DAItemDescriptor to it, or it is a single object and then it would be impossible to use it as a second argument of ReadMultipleItems.
Also, "" is almost certainly not a server ProgID, therefore you should not place it into the ServerDescriptor. It looks like a part of your item name (I have seen similar names with Siemens servers, but do not know the precise syntax).
Anyway, I tried to guess what you wanted to do, and I came with the following code:
Best regards
Also, "" is almost certainly not a server ProgID, therefore you should not place it into the ServerDescriptor. It looks like a part of your item name (I have seen similar names with Siemens servers, but do not know the precise syntax).
Anyway, I tried to guess what you wanted to do, and I came with the following code:
var easyDAClient1 = new EasyDAClient();
DAItemDescriptor[] tags = new DAItemDescriptor[5];
// You need to put in the proper *server* identification to the line below.
OpcLabs.EasyOpc.ServerDescriptor Server = new OpcLabs.EasyOpc.ServerDescriptor("", "<here comes the ProgID of the server>");
for (int i = 0; i < 5; i++)
{
// Not sure about the item syntax below - it depends on your server, you need to figure it e.g. by browsing it.
String ItemName = "S7:[S7_Connection_1].DB101" + ",WORD" + i.ToString();
tags[i] = new DAItemDescriptor(ItemName);
}
easyDAClient1.InstanceParameters.UpdateRates.ReadAutomatic = System.Threading.Timeout.Infinite;
DAVtqResult[] vtqResults = easyDAClient1.ReadMultipleItems(Server, tags);
for (int i = 0; i < 5; i++)
{
listBox1.Items.Add(vtqResults.ToString());
}
for (int i = 0; i < 5; i++)
{
// Not sure about the item syntax below - it depends on your server, you need to figure it e.g. by browsing it.
String ItemName = "S7:[S7_Connection_1].DB101" + ",WORD" + i.ToString();
tags[i] = new DAItemDescriptor(ItemName);
}
easyDAClient1.InstanceParameters.UpdateRates.ReadAutomatic = System.Threading.Timeout.Infinite;
DAVtqResult[] vtqResults = easyDAClient1.ReadMultipleItems(Server, tags);
for (int i = 0; i < 5; i++)
{
listBox1.Items.Add(vtqResults.ToString());
}Best regards
Last edit: 21 Oct 2014 15:56 by support.
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21 Oct 2014 13:54 - 21 Oct 2014 13:59 #2462
by Dirk
Replied by Dirk on topic Reading Multiple values. Wrong data ?
Hi,
I have adjusted my code to:
OpcLabs.EasyOpc.ServerDescriptor Server = new OpcLabs.EasyOpc.ServerDescriptor("", "S7:[S7_Connection_1]");
for (int i = 0; i < 5; i++)
{
String ItemName ="DB101" + ",WORD" + i.ToString();
tags= new DAItemDescriptor(ItemName);
}
easyDAClient1.InstanceParameters.UpdateRates.ReadAutomatic = System.Threading.Timeout.Infinite;
DAVtqResult[] vtqResults = easyDAClient1.ReadMultipleItems(Server,tags);
for (int i = 0; i < 5; i++)
{
listBox1.Items.Add(vtqResults.ToString());
}
I get : [0] = {*** Failure -2147221005 (0x800401F3): Ongeldige klassereeks }
Is my DataItemDescriptor declaration wrong ? In need to read a DBBLOCK WORD and not a Tag.
I have adjusted my code to:
OpcLabs.EasyOpc.ServerDescriptor Server = new OpcLabs.EasyOpc.ServerDescriptor("", "S7:[S7_Connection_1]");
for (int i = 0; i < 5; i++)
{
String ItemName ="DB101" + ",WORD" + i.ToString();
tags= new DAItemDescriptor(ItemName);
}
easyDAClient1.InstanceParameters.UpdateRates.ReadAutomatic = System.Threading.Timeout.Infinite;
DAVtqResult[] vtqResults = easyDAClient1.ReadMultipleItems(Server,tags);
for (int i = 0; i < 5; i++)
{
listBox1.Items.Add(vtqResults.ToString());
}
I get : [0] = {*** Failure -2147221005 (0x800401F3): Ongeldige klassereeks }
Is my DataItemDescriptor declaration wrong ? In need to read a DBBLOCK WORD and not a Tag.
Last edit: 21 Oct 2014 13:59 by Dirk.
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15 Oct 2014 16:06 #2440
by support
Replied by support on topic Reading Multiple values. Wrong data ?
There are some things they do not seem correct.
First, for reading, you should use ReadMultipleItemValues method. The use of OPC properties is very inefficient, and has other disadvantages as well. It is true that the value can be accessed as a property as well, but that should avoided unless there is a specific need for it.
Second, your code, as presented, does not compile: "ItemDesecriptors" is declared as an array of DAPropertyArguments, but assigning a single DAPropertyObjects object to it inside each loop gives a "Cannot convert...." compiler error. Unless I am missing something, please rather send the actual code so that my reasoning can be valid.
Third, assuming that "somehow" this compiles, assigning into ItemDescriptors inside each loop will overwrite its value - it shoud instead place the value into appropriate element inside the array.
I do not have an example of ReadMultipleItemValues right at hand, but I have one that uses ReadMultipleItems (which is even better because it gives you back data qualities and timestamps). Here it is, maybe it helps:
If you still would not be able to put it together, let me know and I will try to write that piece for you.
Best regards
First, for reading, you should use ReadMultipleItemValues method. The use of OPC properties is very inefficient, and has other disadvantages as well. It is true that the value can be accessed as a property as well, but that should avoided unless there is a specific need for it.
Second, your code, as presented, does not compile: "ItemDesecriptors" is declared as an array of DAPropertyArguments, but assigning a single DAPropertyObjects object to it inside each loop gives a "Cannot convert...." compiler error. Unless I am missing something, please rather send the actual code so that my reasoning can be valid.
Third, assuming that "somehow" this compiles, assigning into ItemDescriptors inside each loop will overwrite its value - it shoud instead place the value into appropriate element inside the array.
I do not have an example of ReadMultipleItemValues right at hand, but I have one that uses ReadMultipleItems (which is even better because it gives you back data qualities and timestamps). Here it is, maybe it helps:
public static void Main()
{
var easyDAClient = new EasyDAClient();
DAVtqResult[] vtqResults = easyDAClient.ReadMultipleItems("OPCLabs.KitServer.2",
new DAItemDescriptor[] { "Simulation.Random", "Trends.Ramp (1 min)", "Trends.Sine (1 min)", "Simulation.Register_I4" });
for (int i = 0; i < vtqResults.Length; i++)
{
Debug.Assert(vtqResults[i] != null);
Console.WriteLine("vtqResult[{0}].Vtq: {1}", i, vtqResults[i].Vtq);
}
}
Best regards
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15 Oct 2014 15:08 #2437
by Dirk
Reading Multiple values. Wrong data ? was created by Dirk
I need to read 4 DBblocks each conataining 5 integer values from an S5. The data seems tow be WORD oriented.
OpcLabs.BaseLib.ValueResult[] Vals;
DAPropertyArguments[] ItemDescriptors = new DAPropertyArguments[20];
I use for (int i = 0; i < 5; i++)
{
String ItemName = ConnectionName + "DB101" + ",WORD" + i.ToString();
ItemDescriptors = new DAPropertyArguments(OPCHostName, OPCServer, ItemName, 2);
}
for (int i = 5; i < 10; i++)
{
String ItemName = ConnectionName + "DB102" + ",WORD" + (i - 5).ToString();
ItemDescriptors = new DAPropertyArguments(OPCHostName, OPCServer, ItemName, 2);
}
for (int i = 10; i < 15; i++)
{
//String ItemName = ConnectionName + "DB103" + ",INT" + (i - 10).ToString();
String ItemName = ConnectionName + "DB103" + ",WORD" + (i - 10).ToString();
ItemDescriptors = new DAPropertyArguments(OPCHostName, OPCServer, ItemName, 2);
}
for (int i = 15; i < 20; i++)
{
String ItemName = ConnectionName + "DB104" + ",WORD" + (i - 15).ToString();
ItemDescriptors = new DAPropertyArguments(OPCHostName, OPCServer, ItemName, 2);
}
Folowed by
Vals = easyDAClient1.GetMultiplePropertyValues(ItemDescriptors);
listBox1.Items.Clear();
for (int i = 0; i < 20; i++)
{
listBox1.Items.Add(Vals.ToString());
}
listBox1.Items.Add(System.DateTime.Now.TimeOfDay.ToString());
Both INT and WORD yield the same data.
Is this the right way to do this ? The data is not completely what i expect. The WORD1 value is also changing if i write a value in WORD0
OpcLabs.BaseLib.ValueResult[] Vals;
DAPropertyArguments[] ItemDescriptors = new DAPropertyArguments[20];
I use for (int i = 0; i < 5; i++)
{
String ItemName = ConnectionName + "DB101" + ",WORD" + i.ToString();
ItemDescriptors = new DAPropertyArguments(OPCHostName, OPCServer, ItemName, 2);
}
for (int i = 5; i < 10; i++)
{
String ItemName = ConnectionName + "DB102" + ",WORD" + (i - 5).ToString();
ItemDescriptors = new DAPropertyArguments(OPCHostName, OPCServer, ItemName, 2);
}
for (int i = 10; i < 15; i++)
{
//String ItemName = ConnectionName + "DB103" + ",INT" + (i - 10).ToString();
String ItemName = ConnectionName + "DB103" + ",WORD" + (i - 10).ToString();
ItemDescriptors = new DAPropertyArguments(OPCHostName, OPCServer, ItemName, 2);
}
for (int i = 15; i < 20; i++)
{
String ItemName = ConnectionName + "DB104" + ",WORD" + (i - 15).ToString();
ItemDescriptors = new DAPropertyArguments(OPCHostName, OPCServer, ItemName, 2);
}
Folowed by
Vals = easyDAClient1.GetMultiplePropertyValues(ItemDescriptors);
listBox1.Items.Clear();
for (int i = 0; i < 20; i++)
{
listBox1.Items.Add(Vals.ToString());
}
listBox1.Items.Add(System.DateTime.Now.TimeOfDay.ToString());
Both INT and WORD yield the same data.
Is this the right way to do this ? The data is not completely what i expect. The WORD1 value is also changing if i write a value in WORD0
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