DS SURESH KUMAR

ks.senthil

I am using s7 1200 1214 cpu to control 150 motors. i created a FC with TIMERs in it. now if i call the FC 150 times , i need to use 150 DBs in total for Timers. the total work memory is 75 kb, which is not sufficient as i have too much codes . how to use timers without individual data blocks.

Hi,

Instead of using 150 DB . you can create your own on delay timer by using the system clock pulse and compare instruction.

this won't affect your memory, as well as it don't increase the load.

You can get the one second pulse from Mx.y bit. and connect this to add instruction .

take the add output value as comparator input 1 and use the other comparator input for set time . then comparator start to check the Setpoint time and input once it reach the Setpoint output will become high.

use one reset bit to made the add value become zero.

----| |----(p)--------[use add instruction]--------| ==I |------------( )

------| reset bit |------------[ move value 0 to add instruction input]

you can creat this logic in fb as a multiple instance and use it for these 150 motors. and more

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Dear Kumar;

i have a question ,i would be appreciated if you help me as an urgent case,

i am working with S7-300,i have more than 30 motors in my project,so i want to write a program which Motor  feedback  dont come ( for example 3 second ) memory bit be one.

i dont want to use a lot of timer ,i need one timer for all the motors ,for example i change only feedback number in program.

best regards

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Split from how to use timers without individual data blocks?.

Hi

Write code in FBs and use multiple instance i.e. timer is a varible in STAT area of your FB