Unity FBD Diff Up and Reset Bit

rory

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Join Date
Nov 2005
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NELSON
Posts
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Obviously this is peice of cake in LD, how do you do it in a FBD.

Diff up, positive transition contact.

There is a SET FBD but no Reset FBD? I'm negating the output pin on a SET but that seems a bit too sneaky.

Thanks
Rory
 
Last edited:
Are you talking about Siemens 300/400?

If so;

R - reset
S - set
P - positive edge detection

All available in the 'Bit Logic' folder of the list of functions. Or by dropping in an empty box (with the ??) and typing R,S or P
 
Pulse

It's R_TRIG for rising edge and F_TRIG for falling edge then u can define the pulse duration. All u have to do is in FBD press Ctrl+I to insert then it will give u a box. Then u can simply type the function u need inside the box. In your case type R_TRIG or RESET.
 

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