Modbus address confusion

In my application i have to talk to a servomotor encoder drive with modbus protocol. I've used modbus protocol programming before where i'm aware of the addresses of holding reg, control regs of range 30000 and 40000.
For this particular drive they've not mentioned anyparameter in terms of holding reg parameter or control reg parameter and also the addresses are like the following.
address
00xx H - Monitor parameters
01xx H - basic parameters
02xx H - Extension parameters
03xx H - Communication parameters
04xx H - Diagnosis parameters
my confusion is how do I translate these addresses 4 digit hex number to a 5digit address in the range 30000 and 40000. The manual of the hardware does not say anything about this
Thanks...
Pallavi

it seems very simple q to ask..... it turned out all the regs are holding regs and the corresponding addresses were the decimal equivalent.
01xx H = 256 + decimal
Thanks...
Pallavi

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Modbus address problem

Dear All
I have recently bought a compact FieldPoint system that consist of a cFP-1808 and a cFP-AI-118. I'm getting the system to work in Windows by using express Fieldpoint vias, but I have a requirement to have a Linux version (a embedded computer will control the system) so I have started to looking at Modbus. I downloaded the NI library "nimodbus" and read the help file "Using the cFP-180x as a Modbus Device". From the "nimodbus" library I'm using "MB Ethernet master Query.vi". In this vi there is a control that consist of five controls: "Function Code", "Starting address", "Quantity", "Data" and "Discrete".
According the help file "Using the cFP-180x as a Modbus Device" and page "FieldPoint Modbus Addresses", the address should start with '0' for raw I/O data. Since my analog input module is at slot '1'and I want to read channel 1, the address should be '01001'. But when I try to type this address in "Starting address" control it gets 'converted' to '1001' and during the run of the program I obtain the error code "MODBUS Exception code: 2." which means that my address is incorrect. But when I'm reading the attributes (according the help file It stats with '1', therefore my address is '11001'), I have no problems.
So please explain for me what I'm doing wrong with the address for reading the raw I/O data.
Best Regards
Magnus Svensson
Message Edited by Magnus Svensson on 03-30-2006 08:15 AM
Message Edited by Magnus Svensson on 03-30-2006 08:15 AM

Magnus,
No problem... "Coils" is an old terminology; usually implying closing/opening of solenoid coils.
Here's the Modbus standard -- a good overview:
http://modbus.org/docs/Modbus_Application_Protocol_V1_1a.pdf
The website www.modbus.org has other stuff as well.
Regards,
-Khalid

Map Allen Bradley 1400 addresses to NI Modbus addresses

Hi,
How do I map Allen Bradley 1400 Micrologix addresses like (N7:0, B3:0/1, etc., etc.) to NIs modbus addresses? Can the NI DSC module access the PLC for read/write operations without using the NI OPC server?
Is there any tutorial or URL which specifically addresses the above queries?
Thanks in advance.

It's easier if you are using OPC ... you can map and bridge data between the two protocols quickly through tags (addresses).
Here is what you need:
Modbus << OPC Data Manager >> Allen Bradley
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Let me know if you have any questions.
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Senior OPC Architect

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I am investigating the possibility of converting a Lookout 5.0 addressing protocol to DNP3.
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Can I just export the existing database into Excel, make changes, and then import the modified database?

Wow. That's a lot of unnecessary stuff to digest. All you really need to do is focus on the root cause.
ORABPEL-11800 Unimplemented object conversion. Conversion from JDBC type OTHER is not implemented.
Refer to the documentation on supported datatypes.
[http://download-east.oracle.com/docs/cd/B31017_01/integrate.1013/b28994/adptr_db.htm#CHDDCFCB]
The JDBC reference to java.sql.Types.OTHER means that you're using an unsupported data type.

Getting error code -1967353908 when trying to read a modbus address

I'm using the Modbus I/O server in LabVIEW 2010 to communicate with a Kohler generator. A vendor was able to supply with the the Modbus address mapping so that I'd know what addresses correspond to what IO points. One of the addresses is 40126 which I create in the Modbus I/O server as 400126 since it requires six digit addressing. Well, that worked but only temporarily. Not too long after I begin trying to make sense of the values read, the shared variable begins showing error -1967353908. The description for this error is "The specified data item address is not an allowable address for the Modbus slave device. Refer to the documentation of the Modbus slave device for information about supported addresses."
What I don't understand is why it works one minute and stops working the next. Also, I know that the Modbus server itself is not erroring b/c in my VI there are other boolean bit addresses that continue to report good data. Can anyone assist in helping me figure this one out? Thanks.
Ryan R.

Ryan,
This error may occur with certain Modbus slave devices, because the I/O actually queries for a range of addresses, some of which may not exist on the device. To remedy this issues, reduce the number of Holding Registers in the Advanced Settings of the IO Server to 1.
Let us know if you have further trouble!
Drew T.
NIC AE Specialist

Lookout 6.5 critical crash - writes to random modbus addresses

Hello,
We are experiencing a rather critical problem with Lookout 6.5. The proces file contains approximately 148 Modbus/TCP connections, some overview panels, a properties panel which uses a symbolic link to retrieve properties from a certain modbus object.
Seemingly random, Lookout crashes during operation (with the Windows send/don't send window). When this happens, the second before the crash actually occurs Lookout starts writing seemingly random values to addresses to all the modbus devices. Some to addresses which are connected in Lookout, and to some that are not (even to addresses that actually don't exist on the device, which causes it to return an exception). The addresses do seem to be in an increasing sequence (i.e. it starts at 500, then starts writing further until about 850). Values I've seen are mostly 0, but also 256, 2308, 512, 2048, 3844.
I've attached a packet capture log which shows the write commands Lookout is sending.
Does anyone have any idea what could cause this crash or things I can check?
Attachments:
dump.txt ‏175 KB

Also uploaded a second dump file as Randomwritecrash2.zip - I'll keep uploading dump files in sequence.
Crash data from this dump:
(1328.bd4): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
eax=01cbcd1a ebx=00f70000 ecx=3e720012 edx=3e720013 esi=00f70838 edi=00000009
eip=7c902a9d esp=0013f4f4 ebp=00f70838 iopl=0 nv up ei pl nz na po nc
cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010202
ntdll!tan+0xcf:
7c902a9d 8b18 mov ebx,dword ptr [eax] ds:0023:01cbcd1a=????????
0:000> kb
ChildEBP RetAddr Args to Child
WARNING: Stack unwind information not available. Following frames may be wrong.
0013f4f8 7c91020e 00000009 00f70838 00f70000 ntdll!tan+0xcf
0013f510 7c9101db 0013f744 7c90e920 7c910228 ntdll!RtlAllocateHeap+0x14a
0013f528 7c91019b 00f70838 00000013 0000003f ntdll!RtlAllocateHeap+0x117
*** ERROR: Symbol file could not be found. Defaulted to export symbols for C:\WINDOWS\system32\MSVCR71.dll -
0013f754 7c3416b3 00f70000 00000000 0000003f ntdll!RtlAllocateHeap+0xd7
0013f794 7c3416db 0000003f 7c3416f8 0000003f MSVCR71!_crtLCMapStringA+0x305
00000000 00000000 00000000 00000000 00000000 MSVCR71!_crtLCMapStringA+0x32d

Read/Write a bit in a Modbus Address

Greetings,
I'm working on a project for a customer of mine. I'm working off of his I/O mapping list. We are using MODBUS to communicate to a Motorola MOSCAD FIU. According to the I/O Map, I need to read a bit from address 307682:01 which normal I would translate into 307682.1 but Lookout is not excepting this address as a valid Data Member. So I did some troubleshooting of my own and found that Modbus Data member (307682) is only used as "a 6-digit addresses of 16 bit input registers encoded as unsigned binary integers ranging from 0 - 65535." I guess an analog value.
Is my thought process correct on this? Does my customer need to change his I/O mapping. Am I overlooking something?
Attached is a copy of the I/
O map.
Oliver Scheurer
Aegis Solutions, Inc.
2660-T Yonkers Road
Raleigh, NC 27604
Phone: (919) 861-0103 Ext. 231
Fax: (919) 861-0104
www.aegis-solutions.com
Attachments:
IO_Map_for_lookout.xls ‏69 KB

WOW!!.. I get to answer my own question. You all are slow... J/K...
Anyway, the fine people at NI Tech Support Helped me out with this one. Seems that it is a problem related to Lookout and Modbus. After discussing this problem with a few engineers, I decided to call the customer and let him know of his mistake. Well, he proceeded to tell me that "Wonderware can do it with out a problem". So I called NI Support again, and they told me that further research showed that it is something that was not put into Lookout. The Support engineer started a "CARD?". But he also gave me a work around.
1. create an expression
2, enter getbit(3,1)
This expression will return a ON status since the number 3 in binary is 1 1 and looking at the first bit is 1.
So for my
application I would use
getbit(modbus1.307682,1)
I hope this makes sense.
Oliver Scheurer
Aegis Solutions, Inc.
2660-T Yonkers Road
Raleigh, NC 27604
Phone: (919) 861-0103 Ext. 231
Fax: (919) 861-0104
www.aegis-solutions.com

Inet Address and I.P address confusion

Hi,
I have an I.P address which I recieve from user input in four seperate variables each of type int. The reason I'm doing it this way is for increment purposes. Now the first initial IP address I want to ping to see if it's alive or dead. Then the program will increment the I.P address to check the next available IP address to see of that's alive or dead. Stupid University coursework Grrr :(.
What I was thinking (in theory anyway) is to convert all the digits from all four variables into the one I.P address and get that as an Inet Address object. From there I can use the object easier to Ping. Then I will clear that Inet Address object and increment variable four by 1 to create the next available IP address and then convert the new four variables into a Inet Address onject and ping that object and so on and so on.
Just wondering if in theory I'm on the right tracks or does this make no sense whatso ever? I'm still confused over it but kind of an idea. I'm sort of doing the projects as we learn the language and even though I read lots of tutorials on using Inet address I'm a bit stumped by this project. Any help really appreciate.
Thanks,
No longer a JavaNewbie but far from advanced!

>
Just wondering if in theory I'm on the right tracks or
does this make no sense whatso ever?Yes. Remember that it rolls on 255.
I would also strongly suggest that you get in writing that you are supposed to be creating a port scanner.
People have been fired from their jobs and others expelled from their university when they were given an assignment that the security staff at the institution considered to be a security problem. And their superiors refused to back up the assignment (possibly because the axe would have gone their way.)

6to4 Addresses vs Regular IPv6 Addresses - Confusion

Hi All, (Apologies if this question appears twice. Apparently I had an interface problem)
I'm finishing up my studies on the IPv6 portion of the CCNA material, and my book seems to completly ignore the fact that 6to4 addresses seem to look different than how the rest of the chapter portrays IPv6 addressing. I've done google searches, and unfortunately I don't have anyone at work who is versed enough in this who will know, so I'm hoping someone can help.
1. A normal IPv6 address: 2001:0db8:3c4d:0012:0000:0000:1234:56ab
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   All of these addresses have, or will have 8 octets if written in long-hand, in other words - a valid IPv6 address.
Here's my problem: The addresses in the 6to4 section look like this:
   ipv6 address 2001:db8:2:2::1/64
The book fails to mention what the "1" before the /64 is for, but I am assuming that it is an identifier and not part of the IPv6 address due to the " :: "   However, if this is the case, I only see 4 octets, and no eui-64 command, directing that the other 4 will be populated by the MAC padded. And the "ipv6 address" syntax leads me to believe that this is a host address, and not a block/space statement (i.e. "ip address 192.168.0.1. 255.255.255.0," as opposed to "network 192.168.0.0 255.255.255.0)."
If someone could shed some light on this, it would be most appreciated, as it is very confusing.

Also, 6to4 IPv6 addresses have the IPv4 address of the 6to4 gateway embeded in them as well. That is why they have a whole reseved block of 2002:/16. Any gateway can algorithmically extract the IPv4 address for forwarding.
2002:0b0c:0205:5/48 for example, would be correlated to IPv4 address 11.12.2.5 (which is the decimal of the IPv4 address 0b0c:2025 shown in hex)
Earl Carter wrote a nice blog article on the general topic of IPv6 addresses at http://blogs.cisco.com/security/ipv6-addressing/
And the commonutiy has settled on calling the 16-bit numbers between the colons "hextets." In IPv4, each 8-bit portion between dotrs is called an "octet." The truly pedantic will object taht a hextet should be 6 dits, bit "hextet" is easier to say than "hexadecitet." :-)
Anotehr trivia point: The letters in an IPv6 address should awalys be lower case.
More arcana can be found at http://tools.ietf.org/html/draft-hartmann-6man-addresspartnaming-01, which is on track to become an RFC.

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Hi, I'm relatively new to the world of Airport, and having done some configuring of my network today, there's some confusion about the IP address of my Airport (en1) card:
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The problem I have only involves Airport (en1).
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I asked earlier if you were using a computer to share the network from Ethernet to wireless. If you are, I'm guessing that your findings are somehow related to that.
Doesn't 169.x.x.x mean something isn't configured properly?
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2. Am I better off configuring Airport's TCP/IP manually?
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From account Zmail I send a message and copy me in on it. Apprently the From on it gets changed from my Zmail address that was on the outgoing message to my AMail address. At least that's what I see on the copy sent to me, and because of the change my message is being rejected by a recipient who requires e-mail address registration, where I'm registered with my Zmail address.
What Preference or other setting will fix this?

Csound1 wrote:
2 smtp servers, each with the correct credentials for 1 account.
So it simply won't do to send outgoing messages through the same smtp server? I thought I could do that when I was still using Thunderbird as my e-mail client under OS X rather than Mac Mail.

HT201342 email address confusion

I'm using a me.com address in addition to gmail (and rarely used Hotmail and aol)
Why on earth would I now need an @icloud address, giving me TWO Apple addresses?

There is no advantage.
Apple renamed their service from MobileMe to iCloud, so it is logical to change the email address to match.
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ICloud email address confusion!

OK…here goes. I'll try my best to explain my situation. First, I just started (trying) to use iCloud when I got my new MacBook Air a few days ago. (I'm not new to Apple, just a new computer.) I've been using Reminders app on my iPod Touch 5, but had iCloud turned off and Reminders worked perfectly, meaning it alerts me to things I need to be reminded of.
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Thank you, Mr. Churchhill!
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This is the 2nd problem solved today on these forums. I'm so thankful you are all here and willing to share brain cells.

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I am having the same problems and really need a solution....

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Modbus address confusion

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