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Thermal Overload
The threads that wouldn't die...
- PC reliability?
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- Software quality
- Where do we go from here?
- Why pay?
- PC reliability?
- Windows, real time
- PID loops
- PCs vs. PLCs
- Replacing people
- MS 'monopoly'?
- Software quality
- Where do we go from here?
- Why pay?
Fortune
Over the years, I've developed my sense of deja vu so acutely that now
I can remember things that *have* happened before ...
I can remember things that *have* happened before ...
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NTP/Modbus interface for time-stamping
New Replies:
gc05,
NTP, as far as I know, is a network protocol for time-synchronization --- in other words,...
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...
Water/Gas Meter with Modbus/LonTalk/BACnet Compatibility
Serial interface between Allen Bradley's Control Logix and Emerson Ovation DCS
New Replies:
By Alex Baloch on 18 October, 2009 - 12:22 pm -
Were you able to establish communication between the control logix plc and the ovation DCS? of so,...
Doc to configure the jumper of the hmi arcnet isa card
I have 3 Mark v units with 3 HMI (P2 +NT 4.0 +TCI 1.4 + cim 3.21) en the same arcnet network. one is crashed.
Are there any example source codes and free WITS clients and servers, available?
New Replies:
By Kenneth Miller on 17 October, 2009 - 5:45 pm -
I can help you out with questions regarding WITS0.
Email me at ken[at] erdosmiller.com....
Problem reading weight using an rs232 serial port on a pc using VS2005 C#.
New Replies:
By Ian Finlay on 17 October, 2009 - 5:44 pm -
Hi Carlos,
post you string manipulation code here or send to me and see what can be done.
Do...
HMI redundancy is not working correctly.
New Replies:
By Ian Finlay on 17 October, 2009 - 5:20 pm -
Can you force a General Interrogation on your RTU (GI) normally drivers do this on startup. 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...
By M Griffin on 16 October, 2009 - 2:17 pm -
To make something clear about Modbus, this 0x, 1x, 3x, 4x, 4 digit, 5 digit stuff has *nothing* to...
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...
time synchronization in DCS system
New Replies:
By Ketan Lakhani on 17 October, 2009 - 4:29 am -
I feel that it is firstly required to understand as to why the synchronization is required. ...
By Y.K.JARIWALA on 16 October, 2009 - 2:00 am -
We are not very sure , but time synchronization plays very critical role in Multiple Node system we...
jianjian2112,
the target of time synchronization in DCS from GPS that if we have more than one...
how to multiplex RS485 slaves over single RS232 channel
New Replies:
By Jerry Miille on 16 October, 2009 - 4:37 pm -
We have two products that can be used for this application. The Omnii-Comm:
...
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...
Is it possible to use any RS232 to TCP converter or should I use a specific converter for Modbus?
New Replies:
By Paul Wacker on 15 October, 2009 - 3:56 pm -
Francisco -
Modbus TCP is not the same Modbus RTU encapsulated in a TCP/IP packet. So, instead...
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...
baud rate significance in data transmission speed using modbus
New Replies:
Generally speaking the term "baud rate" states how many "symbols" (or...
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...
I've read the entire manual for the LULC031(the modbus module in the TeSysU starter) and i'm trying...
The Sycon software is not required since the TeSysU is using a Modbus connection. Contact your...
By chud on 9 October, 2009 - 2:05 am -
I'm pretty sure you are going to need sycon software to config the tesys starter for...
How to control timer in wago PLC from mytek
Can anybody told me how to tune Baldor Linear motor .
How to decipher the Carel protocol?
Need Assistance Integrating a WDPF QLC Card to an Allen Bradley 1770KF2 module
New Replies:
By Joel Tedder on 12 October, 2009 - 10:09 am -
Hello, have you reviewed the information in Westinghouse Manual U0-1130? ...
Backward compatibility of FGR and FGR 2 radios
Need a PLC that runs on 12 volts and supports IEC 1131-3 Structured Text.
New Replies:
Beckhoff has a large range of controllers that use their Twincat IEC 6-1131 software, allow you to...
Does TwinCAT have Function Blocks for TCP/IP?
Using an old DOS program that relies on serial ports on a new PC without one.
New Replies:
If you want to print reports from the DOS program you can play with network printers assignments...
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...
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...
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