I have just uploaded the latest T3000 software and fixed a possible exception message “Please config the way of your connection!” when using the T3000 Modbus Poll.
I have also repeatedly verified just now that T3-BB TB-LB is able to access a third-party device normally by connecting it to a third-party device in the RS485-Sub Port and using the connection shown below. ()
The only thing to note is that RS485-MAIN and RS485-SUB cannot be set to “Modbus Master” at the same time when connecting to third party devices.The implication is that one of them must be set to Unused.
If both ports are set to “Modbus Master”, the T3 Controller will communicate in accordance with the configuration of RS485-Main port, and if you happen to connect the third party device to the SUB port, the communication will not be normal.
Please check again if the configuration information is wrong.
Updated T3000: OK, works as expected.
Connected my modbus device as requested and launched modbus poll: OK
tested the connection: KO, write error, whatever settings
Please Update T3000 again . Version : Jan 6 2021 . 14
Fixed a bug where the T3000 Modbus Poll established a TCP connection with the server and the connection was disconnected by the server, causing the communication to be unable to continue.
Bug phenomenon: Write Error after communication for some time.
Updated with the latest T3000 version (.14): OK
tried to poll modbus unit: failed
will install another 3rd party modbus device instead of my unit to see if the problem is consistent
thank you for your time
I really can’t find the reason why you;re still experiencing problems.The following screen shot shows my connection as you describe your situation and here result here is completely fine.
I also use the command “04 Read Input Registers(3x)” , all works as expected.
We have both burned up a lot of time here, it would be best for us to do some remote assistance using Teamviewer or https://www.remoteutilities.com.
Please email and arrange a time to connect with you.
I really appreciate the help here.
But prior to this, I’ll hook another 3rd party modbus device that works differently (rs232-485, node-red, plc) and test the T3-LB behavior again with this.
If I have the same kind of problem with another device, I’ll let you remote control a computer with T3000 access.
I connected a Graigar Ultrasonic flowmeter TUF-2000M to my T3-LB.
Prior to that, tested the device through serial and connection and result were as expected:
That said, Temco Modbus poll displays only signed/unsigned values.
My questions are then:
how can I display the right data on T3 registers ?
I have a specific function in my PLC (pack32) to transform 2 x unsigned integers into a float, but I don’t know how to do that conversion in the T3 units
what are the instructions to insert those values into a T3 program ?
Mike , TEMCO Modbus doesn’t support to show float data .
we supply four format instructions to convert float data in T3000 .
case BAC_FLOAT_ABCD:
ptr_panel.info[i].name = “MB_REG_FLOAT_ABCD”;
break;
case BAC_FLOAT_CDAB:
ptr_panel.info[i].name = “MB_REG_FLOAT_CDAB”;
break;
case BAC_FLOAT_BADC:
ptr_panel.info[i].name = “MB_REG_FLOAT_BADC”;
break;
case BAC_FLOAT_DCBA:
ptr_panel.info[i].name = “MB_REG_FLOAT_DCBA”;
T3-Controller program Demo ,
Device connects to T3-Controller via RS485
AR1 = 20.2.MB_REG_FLOAT_ABCD300
VAR1 : No. 1 VAR
20: T3_Controller panel number
2: Device Modbus ID
MB_REG_FLOAT_ABCD : Device float data format
3009 : Device Modbus register address .
Why 3009 (and not 300, taken from your data formatting) ?
In my case, T3 unit = 107, the rs485 sub modbus device ID = 40 and the 2 int16 addresses I want to poll are 35 & 36 and transform those 2 integers into 1 float
what should be the programming line ?
Update:
I tried to poll separately the int values from the subnet modbus device, like:
I poll directly the integers and transform them into float:. I noticed that I need to poll the address of the low integer. But the result is there.
10 TEMPUS = TIME
606 8094V2 = 107.40.MB_REG_FLOAT_ABCD33
608 8096V3 = 107.40.MB_REG_FLOAT_ABCD35
800 REM TEMP DIFFERENCE BETWEEN 2 TEMP SENSORS
810 8098V4 = 8096V3 - 8094V2
However, after few minutes, spontaneously, the setting of the sub network of my T3-LB, while polling, is going from master to slave and the poll stops.Firmware 54.4 and latest T3000
Any idea ?
Update: switched modbus networks: set sub rs485 as unused and set main rs485 as master and will see how it behaves. feedback on this later.
Nope, test finished: same problem, the rs485 switches always from master to slave and stops communication with my 3rd party device.
Update 2: changed rs485 sub for slave and rs485 main for master (despite the topic of this post about the unused setting): no changes, returned to slave after few minutes.
Even rs485 is set to master, if receive some packet from a modbus master, rs485 port of T3XB will switch master to slave automatically. But it never save this change, it is useful for test sometime.
The job of a controls tech is difficult enough already, let’s simplify their lives a little and allow only one option which includes both master and slave functions.
I know it’s very difficult for you to manage this, but do you have a “real” approximative estimate about the time you’ll take to solve those connection problems with sub-networks ? 1 month, 6 months or not scheduled at all ?
Just to know if I wait to connect my third-party devices to temco products without errors or if I should find another way.
Thank you
We’re in the middle of the local holiday but will definitely take a look at your issues as soon as everyone returns to work Feb20.
Update: We’ve made many improvements and updates since this post, if you are experiencing subnet connectivity issues please update the T3000 application first, then update the device firmware.
I’m traying to read input registers for example 34141 and 34142 with a T3-nano but I’m having problems with the code and syntax. It is possible to read those floating registers with one variable? and how is the syntax?
