Internet PLC Forum

Hi There,

I have 5  pcs T100MD888 connected to Fargo Telecom Mobile modems and one Windows server also connected to a Fargo Telecom Mobile modem. All modems are running at 9600 Baud
Once per day or when the DM[] variable reaches a threshold, each plc Modem dials the server modem and dumps the DM[]  ( in a padded format) and reads the RTC.

I use the Trilogi server version 2.0 and  the standard dial modem function supplied by Trilogi.

When sending  the data to the modem it is converted  ? on the fly? to text with zeros being padded and some hyphens and commas are added  as date and field delimiters and a CR for every 10 values in the DM.
Each Record is 10 positions in the DM as follows:
DM[1] = Date, DM[2] = Month, DM[3] = Year, DM[4] = Hour, DM[5] = Minute, DM[6] = Second, DM[7] = Value, DM[8] = ID, DM[9] = Value, DM[10] = Spare,

i.e if the DM Variable looks like this
18 3 2008 9 14 26 1 139 0
18 3 2008 9  9 26 2 139 0
18 3 2008 9  9 26 3 139 0
18 3 2008 9  9 26 1 139 0

it will be sent as records like this

18-03-2008,09:14:26,1,139,0 [CR]
18-03-2008,09:09:26,2,139,0 [CR]
18-03-2008,09:09:26,3,139,0 [CR]
18-03-2008,09:09:26,1,139,0 [CR]

This works and has been working fine for more that 12 months, as long as the DM[] is not filled beyond DM[1500]
If there is more data then some data is lost , not much just a comma or a few characters, but of course enough to corrupt data., and messing up the import rutine on the server
Until now I have solved it by sending data as soon as the DM[] variable reaches 1400 positions.
But now I will be installing at a site where the DM[] will fill up completely 2-3 times a day. So I have to solve the problem., because dialing up 5-10 times per day is to expensive, and the PLC is blocked during the process

I now guess the corruption is due to a buffer overflow I therefore introduced a 400 ms pause  for every 50 records being sent, by adding the following in my ?send and format data? procedure

If Y MOD 500= 1 then
Delay 400
End if

This actually works ( have tried  filling up the DM[] to positions 3840 10 times and transferring data), but prolongs the transfer time by 3 seconds in which the PLC is inactive

But I am worried about using the Delay function, would it be better to make at For Next loop to create a pause in the flow or is there another way of reducing the speed of dataflow?

/PeterH

I have an input activated by a PIR sensor,and I would like to know how long the sensor "goes high" when sensing movement. Is there a way where I can measure the amount of time that an input is activated? I am only talking milliseconds - so reading the RTC is not an option

/Peter

I have blown two RTCs on two different T100MD last week and had to change the RTCs. After changing the RTC and connecting to power - output 6 has been activated and I have had to RESET the unit. I have dones this by downloading the  programme again and clicking  YES to Reset.
But is it possible to RESET the unit without a pc?
Maybe I missed something in the manual

Best Regards

Peter

Hi there,

I have been running the TL server on a Win98 machine with an internal modem for some months now and it is working fine. I have Plcs dialing in and downloading data very night - no problem.

But now I want to move TLServer to an newer/safer XP machine, but I cant make TLserver pick up the phone with the new machine.
I have tried changing modems both internal and external but the problems remains.
1) The PLC dials in Through a Fargo GSM modem tol a landbased line.
2) TLServer recognizes the call with a  "RING"
3) TLServer Hangs up with " NO Carrier"

is this an XP problem or am I looking in the wrong direction?

Anonther question is the Init Straing AT&K0 what is taht i do not recognize K0

Peter

I am using a T100MD+. After downloading a new version of a program i usually say YES to Reset. But now I would like to make some minor modifications to the program and retain the information aleady captured in DM[] + leave the RTC untouched. If I download a new software and say NO to Reset, wille it perform correctly and retain the DM[] values?

Hi there,

I?ve got a new small problem:
I would like to ?filter? the input on 3 input channels, so that I max use one input per 3 seconds.

The inputs are Push Buttons activated by humans. And I don?t want to record somebody activating a button e.g. 10 times i 3 seconds.
I would therefore like to make all 3 inputs inactive for a specific time ( e.g. 3 seconds) when one of the inputs has been activated.
I can do this in Tbasic with the ?Delay? function, but that stops everything else which is not intended.

I just want to stop these 3 inputs from responding

Can somebody help me  with a solution in Ladder instead? Something like this:


Input1 ------- Block   -------------------I-- Out1
                      N.C.                              I-- Block ? Ideally a 3 sec relay
                                                           I--  Function1 ? My stuff   

Input2 ------- Block   -------------------I?Out2
                        N.C.                                        I-- Block
                                                           I--  Function2 ? My stuff   

Input2 ------- Block   -------------------I?Out2
                         N.C.                                   I-- Block
                                                           I--  Function3 ? My stuff   

Hi There,
I?ve got at T100MD888 Plc connected to a  Fargo Maestro GSM Modem. Communication is one way ? From PLc through Modem-to-modem-to-PC-running-Trilogi server
The PLC dials a predefined modem number and  when connected it dumps some of the content of the DM

• variable.

I use Tri-logis custom function to control the modem. This works fine ? most of the time ?.
As long as I only transfer from DM[1] to DM[200] is works every time, but If I send 1000 variables I often loose the line.

I am not sending it  all at once but I packets of 10 the i.e.
Y = 200
For I = 1 to y step 10
   put dm [I to I+10] into to A$ as one string
    Print#1 A$
Next

I hope this ensures that the serial buffer doesn?t  overflow but I am not sure, and I don?t notice if the lines breaks

The problem is I don?t  perform any quality control whatsoever. Just dial up ? send data ? clear ram.
So instead of writing from scratch I just  want to se if there is some code available already, using Incomm/ Input$ to check the transmission.
Any samples I could have a look at?

Best regards

Peter