Ladder Hierarchy
Posted: Wed Jun 13, 2018 8:36 am
I'm having a problem with the ladder logic since the new firmware update, I'm running firmware 4.1.2 build edf0fe2c
The issue I have is as follows
I have float switches which used to protect my elements using ladder logic i.e. if a process / state was asking the element to come on, and the float switch was not made the heat output would wait for the float switch to be made.
The output now comes on regardless if the float switch is made or not....
I have checked the ladder logic, and all is OK, it seems the hierarchy has changed and the ladder does not take priority anymore?
logic is as follows (simplified) |DIN1 | - |PROC0 | - |OUT0| - (OUT0)
|DIN1| = float s/w. normally open
|PROC0| = Fill and heat, state 2 calls for the output to come on. normally open
|OUT0| = Element output
(OUT0) = Element output
Has anyone else noticed this, or has a work around?
Cheers
Pete
The issue I have is as follows
I have float switches which used to protect my elements using ladder logic i.e. if a process / state was asking the element to come on, and the float switch was not made the heat output would wait for the float switch to be made.
The output now comes on regardless if the float switch is made or not....
I have checked the ladder logic, and all is OK, it seems the hierarchy has changed and the ladder does not take priority anymore?
logic is as follows (simplified) |DIN1 | - |PROC0 | - |OUT0| - (OUT0)
|DIN1| = float s/w. normally open
|PROC0| = Fill and heat, state 2 calls for the output to come on. normally open
|OUT0| = Element output
(OUT0) = Element output
Has anyone else noticed this, or has a work around?
Cheers
Pete