Controller communication response

Hi everyone, I'm working with a SCORBOT ER-IX. I have a LabVIEW program to communicate with robot controller (controller-B). All works fine, but sometimes, my labVIEW program enters on infinite loop
The way I work is: send a command and reads serial port until ">" char comes (controller always returns ">" at end of response). Hyperterminal works fine all times, but my programs doesn't: sometimes waits infinitely for ">" and never ends because the "Bytes at serial port" function returns "0" all time and ">" is lost.
Does someone know why this happens or how can I investigate what happens to ">"?
Thanks in advance and sorry my english.

Hi again!. I have been trying the counter solution: I have included logic in order to abort reception after 5 tries of read serial port. I'm not very satisfied with this solution, but I have noticed that even if the controller response is lost, the command is executed correctly.
I post the VIs I uses, If anybody can and wants help I will be very pleased...
Thanks!
Attachments:
FormatearComando.vi ‏10 KB
EnviarInstruccion.vi ‏45 KB
Enviar.vi ‏62 KB

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==============================================
Title:     Disk Array Controller
           Copyright 2008-2011 LSI Logic Corporation, All Rights Reserved.
Name:      RC
Version:   07.80.51.10
Date:      10/03/2011
Time:      15:49:14 CDT
Models:    4980 4981 4985 4988
Manager:   devmgr.v1080api06.Manager
==============================================
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Speed_Control.png ‏103 KB

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Patrick R.

Garbled Communication Alarm

I am receiving an error message "Garbled communication response from Modbus secondary(7): Response..." I have several plcs communicating to one plc via radios, and Lookout is talking only to the one plc. What does this message mean? Is the problem between the plc and the computer, or could it be between the plcs?

I do not just want to increase the Receive Gap. This problem does not occur on a regular basis, but when it does it happens repeatedly. I am hoping to identify the problem before setting the alarm timer higher to avoid the alarms.

Can DAQ send signal to motor controller?

Dear all,
I have been busy with a project since 6 months. This project involves a DAQ which acquires loadcell samples while a linear motor pressing on a loadcell.
the DAQ i am using is "NI USB-6343", the linear motor controller is Newport SMC 100(has its labview drivers). I am controlling both of them with labview and I managed to build my application. BUT there is only one problem.
The problem I am facing is: The motor controller has a limited response time like 220 ms while DAQ is acquiring sample in every 1 ms.
So while running the tests, when DAQ's acquired value reached 5 Newton preload, the vi. stops the linear motor using the motor controller's labview drivers. Since motor controller's response time is high, this preload goes over 5 Newton, because the linear motor keeps pressing the loadcell due the the motor controllers late response time.
So what I want to know is that: When the certain value is reached, can I force the Motor Controller to do "stop.vi" action by DAQ? , for example, Can I manage this with DAQ trigger signal options?
Note: I built my application with case structures(like move the linear motor in true case untill a value is reached, then get to the false case structure to stop the motor and return home position)
Kindly waiting for your responses,
I really want to solve this problem, please help me.
Sincerely,

Dear apok,
Please see the attached view of my vi. I can not try to enter lower preload to match with what I really want, because it is unpredictable and it is not professional solution.
It is always 220 ms for motor controller. Isn't there any solution with DAQ triggering options or something else?
Kind Regards,
Sincerely.
Attachments:
Loadcell&MotorControl.png ‏286 KB

Response time between LabVIEW w/DSC module and RSLinx OPC server hosting FlexLogix PLC tags too long

We are experiencing communication response time delays between LabVIEW with DSC module and RsLinx OPC Server hosting all FlexLogix PLC tags (around 500-600 tags).
The nominal response time for the system watchdog is < 500ms, but we occasionally have spikes of up to 1.5 seconds once every few days even when the system is idling.
Changing more than six PLC connected shared variables at the same time from LabVIEW also causes the watchdog response times to spike above 500ms.
Our watchdog is programmed so that LabVIEW toggles the watchdog bit to 1 as soon the shared variable event detects that the PLC has toggled it to 0. The PLC, however, waits 300 ms until it toggles it.
Our system:
Windows XP SP3
LabVIEW 9 F3
RSLinx Opc Server v2.54
Allen Bradley FlexLogix PLC

What is your update rate set for in the RSLink OPC server?
You aren't toggling the same flag from both ends are you?
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

Controller communication response

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