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Can MicroLogic PLC read Modbus Holding Registers in the 5xxxx range?
New Replies:
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....
from the Forum department...
AB Micrologix 1100 Modbus Communication with Telemecanique Motor Startertrying to communicate an AB ML1100 with a Telemecanique motor starter unit with a modbus communication module
New Replies:
...figured it out. Two problems were found:
1) Incorrect wiring. I was using a CAT5 cable, RJ45...
The Sycon software is not required since the TeSysU is using a Modbus connection. Contact your...
How to control timer in wago PLC from mytek
How to decipher the Carel protocol?
Illegal response size error message on ABB PLC
New Replies:
By Rob on 8 October, 2009 - 11:17 pm -
Quoting from the ABB Control Builder M On-Line Help Documentation ......
Usage of...
INTERFACING SIEMENS S7 PLC WITH ABB AC800M + COMPACT HMI
New Replies:
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...
Read slave modbus from CPU Quantum.
New Replies:
By automatman on 8 October, 2009 - 2:05 pm -
I've been able to configure the primary and stand-by modbus quantum ports. Primary is adress 1 and...
By automatman on 7 October, 2009 - 2:29 am -
I've to read seven slaves.
I've considered your solution 3 and I think is good.
Now I'm...
By Schneider Italy on 5 October, 2009 - 10:24 am -
For sure M340 is a solution but is not cost effective!! You could use Premium HSBY instead of...
By automatman on 5 October, 2009 - 6:17 am -
I've asked to schneider spain and told me that CEV 174CEV30020 is out of catalogue. From schneider...
Hi there,
One way to solve it, could be to use a gateway from HMS, see:
...
By Schneider Italy on 4 October, 2009 - 4:03 am -
You have three solutions:
1. copy all 3x objects to 4x in the slaves
2. use CEV...
I too was confused by the original question. The issue is not with Modbus function codes but with...
By Bruce Durdle on 2 October, 2009 - 9:37 pm -
Going back to the original post, I think that the problem is that the scanning feature within the...
By Harvard on 2 October, 2009 - 5:17 pm -
I was mistaken about Function Code 6 because it writes single Holding Registers (4xxxx). Function...
By Harvard on 2 October, 2009 - 4:54 pm -
Not sure what you mean by "the company that originated Modbus protocol" but, Modbus by...
By automatman on 2 October, 2009 - 11:58 am -
Thank you for your interest.
I have questioned, but this configuration has two CPU's for...
You are correct. Unfortunately, the company that originated Modbus protocol did not elect to...
Exception Coils, Diagnostic Register and Counters
New Replies:
By rudd on 8 October, 2009 - 4:11 am -
> All are device dependent. Modbus Registers are 16 bit register values that contain a binary...
By Harvard on 7 October, 2009 - 10:26 am -
All are device dependent. Modbus Registers are 16 bit register values that contain a binary value...
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 Jerry Miille on 5 October, 2009 - 9:23 am -
You are absolutely correct, only one master "at the same time". It is possible to have...
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...
Question for anyone that uses Kepware OPC with a serial server.
New Replies:
By Fred Loveless on 7 October, 2009 - 10:16 am -
The advantage to do the protocol conversion (Modbus TCP to Modbus Serial) is that you can have...
By Jay Banks on 6 October, 2009 - 5:48 pm -
Thanks for the info.
Can you tell me if you have a preferred method to accomplish this, or does...
I need to connect to an HMI that does not have AS511 support...
We need to talk to Crestron with a Beckhoff PLC, by using the Crestron read/write blocks
Grass root project looking a cheap way of bringing groups of temperature signals that are in close proximity into a DCS
New Replies:
By David on 28 September, 2009 - 7:10 pm -
HART is an FSK signal superimposed onto a 4-20mA signal from a field transmitter. The HART signal...
>> groups of temperature signals <<
> I would think that you mean thermocouple...
DLL difference
New Replies:
LLC and MAC are not any relevant terms in ModBus domain.
I'm just guessing, but could you be...
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...
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