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Messages - support

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3076
Technical support / Re: about your product cost
« on: December 08, 2003, 06:47:49 PM »
Yes, the T100MD888+ PLC with 8 digital inputs, 8 digital outputs, 6 analog inputs and 2 analog outputs are sold for US$199.00 each. However, first time user needs to get a "Starter Kit" for $259.00 that includes the T100MD888+ PLC, the Internet TRiLOGI programming software, the programming cable and all the manual.

3077
Technical support / Re: Certification
« on: December 08, 2003, 06:53:23 PM »
All our PLCs carry CE logo with declaration of Electromagnetic compatibility with the Euopean Union requirement.

However, all the PLCs do not require FCC or UL certification due to the low power nature of the product (UL Class 2 devices) and the way in which they are being used. You can however still use the PLC in equipment that are destined for UL listings.

3078
Technical support / Re: TRi-ExcelLink
« on: December 08, 2003, 07:11:53 PM »
The TRi ExcelLink writing interval is not meant to be very precise since it is based on a Java thread sleep time which can be affect by the execution of other application.

What you can do is to use the ExcelLink as a DDE server and then write a VB Script (Excel macro) that monitor the PC's internal clock and at the precise moment where you want to capture the data, you can activate the ExcelLink action that have been defined to capture the data into the spreadsheet. You can obtain more info about how to use the ExcelLink DDE server function from the ExcelLink help file or from the following link:

http://www.tri-plc.com/ExcelLink/ddecontrol.htm

There is a sample Excel spreadsheet file called "testmacro.xls" in your ExcelLink folder. You can open it and find out how to trigger the ExcelLink action from within Excel program.

3079
Technical support / Re: creating Menu System in ladder
« on: December 09, 2003, 08:24:58 AM »
I assume you are using the LCD display to create a menu structure. You will need to use a memory location (DM or A to Z) to keep track of where you are and then a custom function will display the correct text based on the pointer.

If you want to use 3 buttons to change set point, there is already an example in your "samples" folder called "SetTimerCtr_SV.PC5" which you can follow to learn to change any of the 3 timers or 3 counters in the PLC.

3080
Technical support / Re: Scrolling List on MD-HMI
« on: December 10, 2003, 11:59:58 AM »
The LCD does not handle scrolling automatically. You will need to control it fromwithin your program. Basically you use a variable as an index (e.g. N), and when you press the scroll up/ scroll down button you will increase or decrease the value of N by 1 until the limit is reached. Then your custom function that display the tool list will have to use the value of N as the beginning tool number and display the list up to the maximum number that can be displayed on a single 4 x 20 screen. This should be quite easy to achieve.

3081
Technical support / Re: Modems for remote access of M series
« on: December 11, 2003, 06:28:22 AM »
We haven't personally tested a cellular modem ourselves so we can't really recommend any particular brand. Have heard some users used the Siemen GSM modem with success but it cost a bomb. If you find something low cost and work well please let us know. ;)

3082
Technical support / Re: Using Analog Input to control process
« on: December 12, 2003, 09:29:45 AM »
The TBASIC language supports IF THEN ELSE statements so it is really easy to achieve. E.g.

IF ADC(1) > 2000
   CLRIO  HEAT1      ' HEAT1 is the label name of heat output.
ELSE
   SETIO  HEAT1
ENDIF
  
For more example programs, please visit:

http://www.tri-plc.com/examples.htm

3083
Technical support / Re: programming e-10s with win XP
« on: December 15, 2003, 04:09:14 PM »
Yes, we already released a Windows version of TRiLOGI software - WinTRiLOGI version 3.5. It works with newer E10+ PLCs. However, due to the timing compatibility issues between old E10 CPU and the Windows (Windows is too slow to react to the E10's required response time) we could not make the Windows version of the software work with the old E10npn and E10-Relays.

For more details, please visit:

http://www.tri-plc.com/e10intro.htm

Price of E10npn+ and E10-Rly+ still the same as the older E10npn and E10-Rly.

3084
Technical support / Re: programming e-10s with win XP
« on: September 03, 2003, 08:41:00 AM »
Windows XP does not allow a DOS program to take control of the hardware (including the com port) so the DOS TRiLOGI program that is used for programming the E10 PLC, when runs under Windows XP, NT or 2000 will have trouble communicating with the PLC.

Your best solution is to use a DOS diskette or Win95/98/ME startup disk to boot your PC into pure DOS mode and then run the DOS version of TRiLOGI software in pure DOS mode.

3085
Technical support / Re: Timers won't turn off
« on: December 16, 2003, 12:06:33 PM »
Try moving the rung that contains the timer coil to the further down the ladder rung from the sequencer. The reason is explained in Page A 1-3 of the Internet TRiLOGI Programmer's reference under the topics "3. Timer Contact Updating Process".

If this does not resolve your problem, your can email your program to support@tri-plc.com with explanation note on the problem area and we will examine your program and identify the problem in your codes.

3086
Technical support / Re: Stepper Motor control question
« on: December 16, 2003, 12:15:43 PM »
How is the PLC's output interface to your stepper driver? Is it a direct connection or going through some interface circuitry. The interface circuitry may introduce some distortion on the stepper signal if it is not properly design.  Use an oscilloscope to examine the signal integrity when it arrives at the driver if you involve external interface circuitry.

The PLC normally should be able to output good square wave up to 10KHz. Beyond 10KHz the time spent in servicing system interrupts may become significant and that can have effect on the motor. Are you using interrupt intensive operation such as pulse measurement or high speed counter simultaneously? Are you using any READ_EEP or WRITE_EEP command?

Note that the CPU disables interrupt temporarily during EEPROM write in order to protect integrity of the data. Thus if you write to EEPROM a lot during the stepper output phases then the stepper pulse generated may not be squarish because the stepper output also depend on interrupt to handle the step counting and acceleration/deceleration.

3087
Technical support / Re: TTL inputs on MD888+
« on: December 20, 2003, 02:04:46 AM »
Sorry, your response didn't sound like a question to us. Anyway, if your sensor has a communication protocol, then the simplest type to interface with our PLC will be one that support MODBUS RTU or MODBUS ASCII protocol. The PLC has built-in support for these protocols so it is very easy to use. If yous sensor can communicate using CR-terminated ASCII strings then you can use the PLC's built-in PRINT #, INPUT$ or NETCMD$ to communicate with your sensor. For hardcore type communication device, the TBASIC support 16 bit CRC computation but you have to write the whole driver using INCOMM and OUTCOMM to talk to the sensor.

We don't support Dallas 1-wire protocol.

3088
Technical support / Re: TTL inputs on MD888+
« on: November 29, 2003, 11:36:28 PM »
You mentioned "temperature" and "humidity" sensors. Wouldn't these be analog type of output? "TTL" refers to 5V digital logic voltage where > 2.0V represent logic 1 and < 0.8V represent logic 0.

If you can confirm that your sensors is analog voltage of 0-5V you can connect them to the PLC's analog input. But if these are really TTL level (maybe a pulse trains whose frequency represents the magnitude of the measurand) then you can convert the TTL voltage level to the PLC's NPN input level using a low cost ULN2003A or ULN2803A IC. The circuit can be download from the following link:

http://www.tri-plc.com/appnotes/TTLtoNPN.PDF





3089
Technical support / Re: PWM 250V
« on: December 21, 2003, 07:22:25 PM »
I had thought that you wanted to control something like power applied to heating element, then by controlling the duty cycle of turning ON/OFF the power to the load you can change the applied power.

However, AC fan speed cannot be controlled by PLC's PWM output! It just won't work that way. The only way to control the speed of AC fan is to use VFD (variable frequency driver) which will vary both the frequency and amplitude of the applied AC power to the motor in order to control its speed.

3090
Technical support / Re: PWM 250V
« on: December 20, 2003, 02:10:24 AM »
Your are controlling AC load using your SSR? Then PWM may not be the suitable choice since PWM is used to chop up DC voltage into deterministic duty cycle and typically operates at several thousand Hz. In your case you probably have to turn ON and OFF at much slower speed. It may be still possible if you use the lowest frequency (16Hz) PWM but do check with your SSR supplier to find out if a zero crossing or instant on type is more suitable to be driven by the PWM.

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