Internet PLC Forum

General => Technical support => Topic started by: CYBERTEK007 on April 28, 2006, 11:27:47 PM

Title: ladder help
Post by: CYBERTEK007 on April 28, 2006, 11:27:47 PM

i am trying to  make a on delay and a off delay run the same output

thermostat on---------------------------------------------------compress  on (out)                                                                                                                    
            |
            |_____delay on 30 sec___________________Fan on (out)
             |
             |_____delay off 2 min ------------------------------Fan on (out)

my mind is not yet intune with ladder logic
How do i this simple circuit
it seems to me that the timers need to see a change of state

do i need to wright a custome functionto do this?

please help                                                                                            
                                                                                                           
                                                                                                         

Title: Re:ladder help
Post by: CYBERTEK007 on April 29, 2006, 09:56:53 AM

Ok
Well i got the On Delay to work Still lost onthe Off Delay

Thermostat_____________________________________OnDelay_10
                                                                                                 (TIM)

OnDelay_10____________________________________Comp_On
                                                                                                 (OUT)

Comp_On______________________________________OnDelay_90
                                                                                                  (TIM)  


OnDelay_90______________________________________Fan_On
                                                                                                 (OUT)

This Works But is it the Rigt way,Best Way and how do i do the Off Delay for the Fan

Title: Re:ladder help
Post by: plc_user on April 30, 2006, 03:05:54 PM

In reference to your original example:  I believe this can be done with an interlock.  Please check the programming manual for the interlock on, interlock off special input bit.  This should accomplish what you have depicted in your first example.

Good luck
plc_user

Title: Re:ladder help
Post by: support on May 01, 2006, 10:51:51 AM

An example of OFF timer is as follow:


        ON                     Out1
|------||--------------------[Latch]
        OFF                     T1
|------||--------------------(TIM)
         T1                    Out1
|------||--------------------[Clear]