resitec

Hi guys... First of all thanks for your tips. I already have finished the machine and it's fully working, but like "panic mode" said "is huge inrush when all loads kick in, and -> all at the exact same time". The factory lights flick a litle.... What can i do in order to reduce the "kick in" factor? Best regards

Thanks Crossbow, i've searched the manual for powered extension units and found one that will help the system, but i'm not sure that is enough. Can you say if this system will work, or i'll have to make some more changes? 1 UNIT FX2N 32MR ES (i already have it) 4 UNITS FX2N 16EYT 1 UNIT FX2N-32ET - Pow. extens. unit 1 UNIT FX2N-8AD (i already have it) What i need: 80 transistor outputs 8 analog outputs 16 inputs 16 relay outputs Regards

What you mean with "powered extension units"? Is it an extension that can provide more power to the system, helping the plc with the extension modules? The heaters are close to the plc. Regards

First of all, thanks for your reply. I will try to explain better what i want. I have to make an individual temperature control for 80 heaters. This is for a thermoforming machine. This type of machines doesn't have a temperature closed loop controller. They use a percentual control, e.g. the user just have to put the percentual value for the respective heater. In my case the machine has 80 heaters, the plc will controll them through SSR's I was thinking controll them through PWM, but the plc has only one pwm instance. As the pwm period cycle is 1 second can i use 2 timers for each pwm ? I need at least 160 timers, plus the timers for the machine movements. Is it possible that with so much timers the plc will slow down and go "crazy" ? I already have the folowing products: 80 SSR (zero crossing) 1 UNIT FX2N 32MR ES 5 UNITS FX2N 16EYT Can i add the system 1 unit FX2N-8AD, so i can read the temperature in 8 points? Or i will have problems because there are too many modules conected ? Best regards

Thanks for your reply. I will try to explain, I'm trying to make a percentual control to 128 independent heaters. The only way i know to make a percentual control is with a pwm cycle. Although i'm not interested in a PID control function. Regerds

Greetings Can i use 128 PWM cycles for heaters control on a FX2N plc? This system has 2 plcs (FX2N), one is controlling the heaters and the other is controlling all the movements. I was thinking use PID cycles instead of PWM, is that possible? Regards Amilcar Antunes