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Installing several air monitoring sensors
New Replies:
We are using Modbus485/CS3000 to talk to some SLC500's and a set of gas sensors... what is your...
Need to connect Micrologix 1100 PLC to Agilent 34980A.
New Replies:
By Harvard on 18 November, 2009 - 11:21 am -
Am I missing something? What does the IEEE 488.1 and 488.2 standard have to do with RS485? The MM...
By Harvard on 16 November, 2009 - 11:12 am -
You can configure the MM Transmitters with almost any generic Modbus Host. For example, the...
We have the base models of the MM. off the top of my head I think it's the 1700 so it only has one...
By mongerf on 13 November, 2009 - 9:57 pm -
Your existing Micrologix 1100 can easily read modbus registers into its own internal data...
By Harvard on 13 November, 2009 - 9:01 pm -
Are you sure you even need Modbus? Most all MM Transmitters support 2 x 4-20 mA Analog Outputs that...
By Harvard on 13 November, 2009 - 8:50 pm -
The PLC would serve as a Modbus Host over RS485 to all MM Transmitters. The PLC program would then...
I have been instructed not to go with the option of using the VB modification. We already have the...
By Mark on 12 November, 2009 - 12:25 pm -
Check out Automated Solutions' website for a Modbus (master or slave) ActiveX Control that can...
By M Griffin on 11 November, 2009 - 4:25 pm -
You will need a Modbus driver that will work with MS Visual Basic, and you will need someone who...
Can only read 6 registers from Controlotron 1010 flow meter via Modbus
New Replies:
By Paco on 16 November, 2009 - 11:30 am -
I set up a Test jig with a piece of plastic pipe so I could get some flow rate albeit very low with...
Yes, If you are experiencing a communication failure and the active light stays on then you will...
I'd like to pull data from the Telemecanique Zelio Logic Relay.
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By chud on 6 November, 2009 - 1:15 am -
If you want to use modbus you must buy a modbus expansion unit to plug on the side of the zelio...
If you need a Modbus and OPCServer converter, check out the FieldServer OPCServer from...
By DanMuller on 5 November, 2009 - 8:47 am -
I would be surprised if you find a freeware server that will do the job. If the one you have is not...
Thanks Wassim for your response,
I regret to inform you that the link you posted is reported as...
We are having 10 third party PLC systems to be connected to DCS. We wanted to use ModBus TCP/IP protocol. For this, OPC server facility is required or the PLCs will act as ModBus TCP/IP Server. Please clarify
New Replies:
By Wassim Daoud on 3 November, 2009 - 9:53 pm -
OPC won't drive your cost up at all (note the price in the link below). The OPC server for Modbus...
I'm assuming that your 3rd party PLC currently communicate through Serial MODBUS. In that case you...
If your PLCs have Modbus TCP server cards you don't need a OPC server. If your PLCs don't...
By David on 3 November, 2009 - 12:57 pm -
If your DCS talks Modbus TCP as a Modbus master directly (a likely scenario) the DCS can talk...
By Roy Matson on 3 November, 2009 - 12:42 pm -
If your DCS and your PLCs are all capable of communicating in Modbus TCP/IP you shouldn't need a...
How can HC900 communicate with ML50?
New Replies:
By Art O on 28 October, 2009 - 1:09 pm -
Hi Keith,
HC900 does support Modbus/TCP so the suggestion from Patrick L to use a Modbus/TCP to...
By David on 24 October, 2009 - 8:31 am -
Sorry, I can't help on facts about ML-50. Whatever the ML-50 is, I've never seen or heard of it...
VB - Modbus
New Replies:
By Harvard on 24 October, 2009 - 9:34 am -
> please kindly help how to make a VB can read a modbus? for example I want to >make a VB...
implementation question on Linux-based PC: t1.5 and t3.5 frame timing in the ModBus RTU standard
New Replies:
By M Griffin on 21 October, 2009 - 5:48 pm -
When you are talking about Modbus, you have to keep in mind that there are several different forms...
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...
Embedded Modbus Slave Response
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By M Griffin on 18 October, 2009 - 9:58 pm -
Yes the order in which you check things matters. There are flow charts and state diagrams in the...
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...
By Steve on 17 October, 2009 - 7:46 pm -
Hi,
I am looking for a water meter and a gas meter that can output Modbus, LonTalk, or BACnet. Do...
Can MicroLogic PLC read Modbus Holding Registers in the 5xxxx range?
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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...
INTERFACING SIEMENS S7 PLC WITH ABB AC800M + COMPACT HMI
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By Rob on 8 October, 2009 - 11:02 pm -
Yes, you can if you wish. No, you don't require any other methods.
I assume your S7-313C PLC...
Looking for a PC running XP or similar that contains RS-485 ports.
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 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...
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