Convert from Alley to S7

[google08]

Hi i tried to convert this program
http://imageshack.us/f/843/logixproladder.jpg/

2 way traffic light
from Alley to S7 but i cant seem to find the

Alley

T4:0/EN ?
T4:0/DN ?
T4:0/TT ?

What do they call Thoose 3 in Step 7 i tried all combination C0/EN C0/DN C0/TT but i have red all the time

 

[TurpoUrpo]

You need to understand what those are and then make them yourself.

 

[DamianInRochester]

The Q bit of teh S7 Timer corresponds to the DN on the AB side.

S7 does not have equivalent pre-defined status bits for EN and TT.

All EN means is that the timer is receiveing true logic or not.

All TT means is that the timer is enabled (EN is true) but has not reached preset yet.

As Turpo says, you will have to create these signals using additional logic.

Your other option is to re-arrange the logic so that these bits are unecessary.

 

[DamianInRochester]

To clarify about the DN bit, in S7 all you need to do is reference the timer as a contact to get the equivalent of the DN.