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Messages - leo9

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1
Technical support / Re: PID ramp temperature control
« on: June 30, 2003, 07:03:56 PM »
However, since I am new to PLC?s I am still stuck with my original problem!

Namely; Start cycle. Ambient temperature. Freeze to ?45 C in 15 minutes. Hold at  ?45 C  for 165 minutes. Ramp heat to +40 C  in 1080 minutes. Hold at 40 C for 120 minutes. Cycle ends. ( Heating/Refrigeration output on/off)

Kindly assist me by means of a generic illustration on how to create a 24 hour clock to control my temperature curve?

Although the air-conditioning example gives me a greater understanding I am still unable to grasp ?Time Temperature? increment relationship.

 ???

2
Technical support / Re: PID ramp temperature control
« on: June 12, 2003, 06:49:44 PM »
Thanks for your advise since this is an upgrade on to an existing machine we do realize that we will have overshoot but the process can live with it. My original question remains as posted. Kindly advise if you have a example and/or direct where I can get it. Thank you. ???

3
Technical support / PID ramp temperature control
« on: June 11, 2003, 07:30:35 PM »
Hi,
Can anybody help by means of an example on the following using T100md888.
Start cycle: Ambient temperature freeze to -45 C in 15 minutes. Hold at -45 C for 165 minutes. Ramp (increment) heating from -45 C to +40 C in 1080 minutes. Hold at +40 for 120 minutes. Cycle ends.
Thanks. ???

4
Technical support / Re: HVAC Control
« on: July 28, 2003, 12:26:57 AM »
This is the program. I still have syntax errors. Kindly advise on this. Thank you. ???
S= ADC(5)*(500+500)/4096 -500
T= ADC(1)*(500+500)/4096 -500

S= -450
IF(S-T) > 1
   SETIO OUT3
ELSE
   CLRIO OUT3
REM T < 1
ENDIF

IF(S-T) > -1
   SETIO OUT4
ELSE
   CLRIO OUT4
REM T < -1  
ENDIF

5
Technical support / HVAC Control
« on: July 25, 2003, 11:04:35 PM »
I have an SYNTAX ERROR in a dCusf HVAC control.
I have the tried your HVAC sample and have exactly the same problem. If you refer to the sample program the syntax error occurs at  CLRIO OUT1
IF S -T > 15
    SETIO OUT1
ELSE
    CLRIO OUT1  T < 1.5
Kindly advice

6
Technical support / Re: MD-HMI
« on: August 12, 2003, 07:55:02 PM »
Thank you I have arrived.
Note your documentation on your equipment is not clear especially to novices

7
Technical support / MD-HMI
« on: August 11, 2003, 05:36:30 PM »
I have a T100MD 888 and MD-HMI.
My program runs under simulation mode and key inputs and led's outputs works.
However when I down load the program to the plc none of the keys or led?s work on MD-HMI?
 Further if I go to online monitoring and activate the keys it works. Did I miss something?
I have assign inputs 10=key 0 ~19=key 9, 20=key delete, 21= key enter, 22=F1 ~25=F4.
Outputs 10=led 1~ 13=led 4, 14=F1 led~ 17=F4 led.
Kindly advise. ???

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