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Connecting Data Flow Systems Hyperserver to a GE 9030 OLC using standard Modbus addressing.
Addressing Problem with Modbus/TCP
New Replies:
I agree, sounds like a block of addresses. For the first address in a table the protocol reads 0,...
By M Griffin on 30 October, 2009 - 4:15 pm -
The "1" digit on the front of the address might be just a "type" indicator. The...
Any one have any idea about Toshiba IFMB640TLE...
Any of you know how to minimize delay time in MODBUS RTU over RS-485 2-wire
New Replies:
By asaria on 28 October, 2009 - 11:48 am -
I had checked it. From panel, I tried to read data from slave using Modbus simulator, i got only 2s...
By asaria on 26 October, 2009 - 10:24 am -
What do you mean by KeyUp and KeyDown timing?...
I'd check to see if the slave has a "response delay", or similar setting.
Also, since...
It is possible to get reply from logo in seconds if you can change/access modbus communication...
By Harvard on 25 October, 2009 - 11:32 pm -
Seems you probably have a KeyUp/KeyDown timing issue. The most common problem is the slave responds...
Modbus RTU master for versamax PLC
how to multiplex RS485 slaves over single RS232 channel
New Replies:
Hi Patrick,
Thanks for the reply. Your product too does what we needed, but as I just said in...
By Patrick Lansdorf on 16 October, 2009 - 3:10 am -
Hi,
I think that there are a number of options that you have to choose from. I would use a...
By Vance Newman on 16 October, 2009 - 12:02 am -
What exactly are you trying to do.. For example.. Connect 3 slave (Remote) through modem to PC...
Water/Gas Meter with Modbus/LonTalk/BACnet Compatibility
New Replies:
Hello Steve,
For your application, I recommend using a Sensus (or Sensus-compatible) water meter...
how a flow meter communicate
New Replies:
For your application, I recommend using a Sensus water meter and a Sensus gas meter, both of which...
Can MicroLogic PLC read Modbus Holding Registers in the 5xxxx range?
New Replies:
By M Griffin on 17 October, 2009 - 1:43 pm -
Thanks to Mark for the correction. It appears that old versions of the Modbus spec did make some...
By Mark on 17 October, 2009 - 2:25 am -
Hello,
What Mr. Griffin said is 99.99999% accurate.
The current specification: MODBUS...
The typical Modbus Address Scheme is :
0x = Digital Outputs (Bit)(Read / Write)
1x = Digital...
By Harvard on 15 October, 2009 - 11:31 am -
Try reading Register = 50102-40001 = 10101 = 0x2775...
By Patrick Lansdorf on 15 October, 2009 - 3:02 am -
Hi,
I cannot answer if a MicroLogic PLC can read 5xxxx registers. But if it cannot, I would...
Is it possible to use any RS232 to TCP converter or should I use a specific converter for Modbus?
New Replies:
By Harvard on 15 October, 2009 - 11:27 am -
I use a B&B ESP901 Single Port RS-232/422/485, as an example, and it can be used with any...
By Fred Loveless on 15 October, 2009 - 10:04 am -
Modbus over TCP is what you get when you use a straing serial to ethernet converter. This is...
RTU / TCP mapping
New Replies:
By M Griffin on 14 October, 2009 - 6:34 pm -
In a typical Modbus RTU to TCP gateway the data stays the same. It's just the wrapper around the...
By Fred Loveless on 14 October, 2009 - 2:32 pm -
Yes it will remain the same. The address structure is exactly the same....
need to link two modbus master devices
New Replies:
By Patrick Lansdorf on 12 October, 2009 - 5:00 am -
Hi dexdyne,
HMS has a gateway that will fit your application, connecting two Modbus RTU...
How to put to master in the same Modbus bus RS485
New Replies:
We manufacture a Gateway that allows two Masters over the same Modbus Slave devices. It is our DX...
By L.M. on 5 October, 2009 - 9:09 am -
It is possible to use master multiplexer.
For example:...
By dixinke on 5 October, 2009 - 12:34 am -
In the modbus network, there should no more than one master running at the same time....
By Lorne on 28 September, 2009 - 10:03 am -
Check out the PLC09 Arbitrator (www.calta.com). It was developed for exactly this application.
...
By Patrick L on 28 September, 2009 - 2:58 am -
Hi There,
HMS makes a gateway that is Modbus RTU slave to Modbus RTU slave. Connect one master...
I would like to see some sample code. where a micrologic 1100 is being used as a Modbus master.
Does anyone know of multiple vendors of USB modbus plus devices?
New Replies:
By Robert on 26 September, 2009 - 5:27 pm -
I work with with this adapter. Work fine but if you connect them to a different port it will get...
It sounds like you have had some personal bad experience with this. Can you expand on what...
By JoeS on 25 September, 2009 - 2:39 pm -
USB is not suitable for SCADA communications. There is a reason why there is so little support for...
This module works fine. Only issue is to use the same USB port all the time. The driver only...
How the protocol is implemented in a PLC?
New Replies:
By andrzej on 24 September, 2009 - 2:30 pm -
Hello,
Try the websites :
www.modbus.org
www.modbus.pl
Regards
Andrzej...
By Issac Issachar on 23 September, 2009 - 10:51 pm -
I ran across a Modbus app note on Modbus in Spanish just yesterday, modbus.rar
I can't read a...
By M Griffin on 23 September, 2009 - 2:02 am -
Your question is a big vague. The Modbus specs are on the Modbus web site. I believe the link is...
Clone to new OS with new hardware or Clone to new hardware with same OS?
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