[Red Lion PAX2D display via Modbus RTU]

This is also what I understand TXD from one unit has to connect to RXD from the other unit, and I have tried that.  It seems very strange to me that wiring as I mentioned above can communicate albeit with undesired results.

 

ahoover

[Red Lion PAX2D display via Modbus RTU]

Am using Red Lion display, model PAX2D, with an option card for RS232, and want use Modbus RTU to display values from a V350.

 

I can get successful comm. by connecting RXD from display to RXD(pin 3) on V350, and TXD to TXD(pin 4) with no ground.  As soon as common (pins 2 or 5 on V350) are connected to RS232 common on display, comm. halts.

  

By wiring as above, I can read values from registers in the display, but they seem to be random numbers, not anywhere close to what they should be.  For instance when reading register 40483(display baud rate), a value of 8960 is returned no matter what the baud rate is actually set at, and I would be expecting to see a number from 0 to 5 for the 5 baud rates available on the display.

 

PAX2D display manual:  http://www.redlion.net/Products/Groups/Counter/Rate/PAX2D/Docs/04038.pdf

 

PAX2D Modbus table:   http://www.redlion.net/Products/Groups/Counter/Rate/PAX2D/Docs/04045.pdf

 

PAX2D RS232 option card manual:    http://www.redlion.net/Products/Groups/PAXOptionCards/PAXCDC1,2/Docs/12018.pdf

 

V350 program:   https://www.dropbox.com/s/86hmdjtqg0qdkqd/Test%20Display.vlp

 

 

I talked with Red Lion tech support to make sure display setup is correct.   Appreciate any help!

[GPRS & SMS conflicts]

Hi,

My goal is to administrate( online test, download updated programs ) on Vision series PLC's, remotely. I have been trying to do this using GPRS, but have run into some problems. Can anybody help me out?

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Here is the hardware I'm using:

* Enfora Modem with ATT card (card is assigned a private IP) on PLC

* Vision V570 PLC

* PC running Visilogic 9.4.0

* DSL router with port forwarding to my PC

This is process I have been trying:

* Send SMS with IP address of DSL router

* Initiate a GPRS call, either with button on screen, or with SMS message

And here are my experiences:

* When initiating a "call" from the screen, I don't have a problem connecting to Visilogic. The problem seems to be conflicts between SMS & GPRS. When a GPRS call has been made,

and ended, the PLC will not receive any SMS messages, until the PLC has been rebooted. When an SMS message has been recieved (before any calls are made), then a

call is started, the PLC will crash with this message: Illegal Word Operand Access.

* The above seems to happen consistently, although it may be a problem in my program ( see attached file ). If I use the above method to remotely administrate PLC's, I most certainly

need a method of "calling from the PLC" remotely.

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My next question: Is the above method recommended for remote administration, or is there a better way? When I have successfully connected via GPRS the connection seems

very slow, and at least once a download error occurred.

[PID not responding]

Thanks a lot for your helpful information. The SB2 direct contact was the key to the problem. Once I have the PID in my real program, I will need to do an auto-tune, but this gets me started.

Thanks again.

[PID not responding]

I have verified everything you mentioned. The PID status is 12. When I try using the FB auto-tune, PID status is 1, but again CV never changes.

I have posted the program along with the output from the PID server log that I used to try auto tuning.

Thank You

V130_PID_Test.vlp

[PID not responding]

I have setup a simple PID conf by editing one of the Unitronix examples, but cannot get it to ouput a CV, no matter what I try.

Am using an analog thermocouple signal for PV, and CV should be ouput to a VFD. I wish to get this PID working at least partially before installing the PLC on the project, and therefore have this setup on my desk.

I tryed manually doing auto-scan, by changing tempatures on the thermocouple, but can not get the CV to change from 0. Any pointers?