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Originally posted by Harvard on 15 August, 2014 - 1:17 pm
Need to know how a slave device that lacks access to the RS-485 COMMON manage to maintain a Receiver common mode voltage between -7 and +12.
New Replies:
Many times 2 wire devices are referenced to frame ground and do not supply a terminal with + and -....
This would still be a chicken and egg issue. If this Slave has a valid receive then it would...
By Lynn August Linse on 18 August, 2014 - 10:17 am -
I guess one work around would be - if you have the common wire available in the bus cable - is use...
No, it keeps the bus from drifting off when neither is transmitting. My thought is that the bus is...
I too gave consideration to the external fail safe biasing as being a ways and means of trapping...
It's possible that the slave device is broke. That is, the common terminal is unintentionally open....
Thank you for the responses and no this is not a trick question. I am dealing with a...
Common mode voltage can be construed as the average of the differential signals, the more apt...
It can't. It may work, it may not....but you're basically playing with fire. We come across many...
By Lynn August Linse on 15 August, 2014 - 2:29 pm -
A trick question? It of course cannot, and it risks damage, although the most common symptom is...
Topic: Communications systems and equipment.
from the Forum department...
Modbus Register Address
Originally posted by Whitepage on 15 August, 2014 - 4:30 am
I have a question about entering the register address in our program PME when I have a 4-digit address.
New Replies:
Actually, the original modicon only supported 0-999 addressing. Anyways, if your driver only...
If you are attempting to pair a master that won't allow configuration of offsets >9999 to a...
Dear Fred , Thanks for your advice. But now i don't know what i have to do for this...
Dear Darrin, Thanks for your reply Can you help to show me the way i can change the modbus...
Yes Fred is correct in the breakdown of the "region" (4=holding register) vs. the offset...
Greetings, the short and quick answer is nothing. The first number in a Modbus register...
Posted by ioudas on 19 August, 2014 - 1:16 pm
Trying to connect a bm85 to a 984 265. Via MODBUS+
Topic: PLCs and related questions.
from the Instrumentation department...
Local Fault on SLC 500
Originally posted by casualguy on 18 August, 2014 - 3:28 am
Local fault indication on our SLC 500
New Replies:
have you checked to see if the power supply feeding the set of flex modules is large enough for all...
Originally posted by ASCF on 4 March, 2014 - 4:08 am
I try to connect a Power Circuit breaker from Schneider to a Siemens PLC using Modbus RTU protocol.
New Replies:
Hi! Do you have some solution on your problem. I see we have the same HW and the same problem,...
Topic: Communications systems and equipment.
from the modbus community department...
RS-485 cable recommended reference
Originally posted by bammaroc on 13 August, 2014 - 6:33 am
RS-485: Reference recommended cable for Modbus communication between DCS and MVI94-MCM systems or PLC
New Replies:
I have to apologize, Belden doesn't make a bonded pair RS-485 cable, the cat cables would probably...
By Lynn August Linse on 14 August, 2014 - 9:53 am -
I agree with Curt - anything over 100m needs a good cable sold as 'suitable for RS-485'. All cable...
Google Belden DataTuff Look at the bonded pair versions. Regards cww...
Posted by Oil & Gas on 15 August, 2014 - 12:11 pm
I need to know how to communicate between telemetering system and PC using cables RS232.
Topic: Communications systems and equipment.
from the Automation List department...
Re: Replace RS-485 with Siemens Profibus Cable
Originally posted by Curt Wuollet on 14 August, 2014 - 9:15 pm
I am building a Modbus RTU network and am considering replacing RS-485 cable with Siemens Profibus cable. Want to hear from those who have done this.
New Replies:
Thanks Curt. I appreciate your answering. I donīt really mind about the purple color. :) Jimmy...
Posted by ABB 800xa on 15 August, 2014 - 10:03 am
Our ABB 800xA DCS server restarted automatically. During restart, all operator stations hung. Unable to connect. Need help resolving the problem.
Topic: Communications systems and equipment.
from the ELECTRICAL PROJECTS department...
Replace RS-485 with Siemens Profibus Cable
Posted by JIMMY SALDIVIAS on 14 August, 2014 - 12:24 pm
I am building a Modbus RTU network and am considering replacing RS-485 cable with Siemens Profibus cable. Want to hear from those who have done this.
Originally posted by John Baron on 10 February, 2011 - 3:41 pm
program to transfer my cnc programs back and forth from PC and cnc lathe
New Replies:
Hello, I need communicate with a CC120M (for parameters and programs) via RS232, can help me? ...
Posted by marinus on 12 August, 2014 - 3:51 am
Master and slave principe with exchanging information thru PLC network
Posted by Robert Perez on 11 August, 2014 - 8:33 am
Connecting an ABB DI801 profibus to module-bus slave gateway with a SST-PFB-CLX master
Posted by Yousif on 10 August, 2014 - 8:29 am
What is the difference between OPC-UA and DNP3 protocol specially in low level layers?
Topic: PLCs and related questions.
from the Process Control department...
RTU Errors in GE Fanuc LM 90 30
Posted by Chris IWO on 9 August, 2014 - 5:52 pm
Lost of Slave RTUs - need help understanding error messages
Posted by scientif on 8 August, 2014 - 6:32 am
How to automate HV/LV distribution substations using SCADA.
Originally posted by Mehul Shah on 16 May, 2012 - 1:43 am
Need to find out if PowerLogic Circuit Monitor Series 2000 supports Modbus or not. Also, if they do, need to find out the modbus register maps for these meters.
New Replies:
Dear Andreas, Could you please send your e-mail? So i can send attachments and other related...
By Andreas Sauerwein on 7 August, 2014 - 1:19 am -
Hi Ercan ERDAS, We try to Implement such a application, and Schneider is not able to give us...
Posted by Debo on 6 August, 2014 - 3:25 am
AB PLC cannot communicate with Siemens TP1200 HMI over ethernet i/p. PLC and HMI are in different gateways.
Originally posted by Vinay on 4 August, 2014 - 8:17 am
To be able to display a process value directly in a PC without using PC based SCADA system
New Replies:
Many transmitters (and other field devices) support the HART communication protocol, which can be...
Check these guys out: National Instruments...
Topic: Computers in manufacturing; also hardware discussion.
from the Automation List department...
Transferring Parameters from BOSCH 120
Posted by Patxi on 5 August, 2014 - 1:17 pm
How to transfer the parameters and programs from the BOSCH CC120 to/from a PC?
Topic: Communications systems and equipment.
from the control department...
Modbus interface with T3000
Posted by control on 4 August, 2014 - 8:53 pm
Other than Siemens device to interface with Siemens T3000 for modbus communication
Originally posted by dinster on 23 January, 2009 - 10:22 pm
interpret 4-20 mA
New Replies:
just add zero value to the equation, so it becomes as (ma-4)*(span-zero/16)+zero in your case zero...
Topic: Power generation equipment control.
from the Forum department...
GSM Protocol and MARK VI
Originally posted by Ahmed samy on 27 April, 2014 - 7:08 am
GSM connection between mark VI and Ovation
New Replies:
Did you get? Do you need something else about this communication (GSM)?...
Topic: PLCs and related questions.
from the Please Help department...
Send And Recieve data between To S7-1200 Plc's
Posted by Donovan on 1 August, 2014 - 3:15 am
Need Help on how to transfer data between two S7-1200 Plc's
Topic: Communications systems and equipment.
from the software department...
Read/Write serial port using php
Originally posted by vasudevan on 31 July, 2014 - 6:22 am
Read/Write from windows serial port using php
New Replies:
That's perfectly understandable if it's the same port. The writing program locks it (exclusive...
Topic: Engineering and workplace issues.
from the electrical, domotics department...
Originally posted by Remi Van Damme on 2 July, 2014 - 1:15 am
is it possible in a modbus network to have a SCADA system which polls for data from the slaves and another SCADA system which also collects data from the same slaves?
New Replies:
We have 2 solutions for your application. In order to avoid having 2 masters in your PC, you will...
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