How to implement 2oo3 Logic

Hello everybody!
Can you help me with this problem:

I have hypothetically 9 Digital Inputs from the Transmitter:
- 3 Indicates Healhy or Faulty( For example create tags A, B and C)
- 3 Indicates Bypassed or Not Bypassed(Create tags A_byp, B_byp, C_byp)
-3 Indicates Bad Process Value(Bad PV) or not BadPV
Let's make general rule that signal "1"(True) is "Faulty" or "Bypassed" or "BadPV".
Attached File Shows in more convenient way how the program should work, but briefly:
1)If all 3 transmitters not bypassed nor bad => 2oo3 logic
2)If 1 transmitter Bypassed others ok then => 2oo2 logic
3)If 2 transmitter Bypassed others ok then =>obviously 1oo1 logic
4)If 2 bypassed and we want 3rd to be bypassed, automatically reject an attempt to activate the last bypass tag value as "bypassed".

and so on
How to implement the 4rth condition in the program? Can you please help me?

How to implement complex 2oo3 logic?

Hello everybody!
Can you help me with this problem:

I have hypothetically 9 Digital Inputs from the Transmitter:
- 3 Indicates Healhy or Faulty( For example create tags A, B and C)
- 3 Indicates Bypassed or Not Bypassed(Create tags A_byp, B_byp, C_byp)
-3 Indicates Bad Process Value(Bad PV) or not BadPV
Let's make general rule that signal "1"(True) is "Faulty" or "Bypassed" or "BadPV".
Attached File Shows in more convenient way how the program should work, but briefly:
1)If all 3 transmitters not bypassed nor bad => 2oo3 logic
2)If 1 transmitter Bypassed others ok then => 2oo2 logic
3)If 2 transmitter Bypassed others ok then =>obviously 1oo1 logic
4)If 2 bypassed and we want 3rd to be bypassed, automatically reject an attempt to activate the last bypass tag value as "bypassed".

and so on
How to implement the 4rth condition in the program? Can you please help me?

Daulet said:

4)If 2 bypassed and we want 3rd to be bypassed, automatically reject an attempt to activate the last bypass tag value as "bypassed".

and so on
How to implement the 4rth condition in the program? Can you please help me?

Click to expand...

I don't understand your question. Doesn't it already do this? (what I circled in red)...



-Eric

No, Eric.
Because I should implement this SIS(Safety Instrumented System) logic solver. All this conditions must be implemented in the scope of SIS logic.
Particularly, I'm using SLC 5/05 with RSLogix 5/05.

Oh, I didn't realize you were trying to create the logic...

Maybe something like this?

|

|  B Bypassed   C Bypassed   Inhibit A

|------] [----------] [--------(  )

|

|

|  A Bypassed   C Bypassed   Inhibit B

|------] [----------] [--------(  )

|

|

|  A Bypassed   B Bypassed   Inhibit A

|------] [----------] [--------(  )

|

|

|  Bypass A Req.  Inhibit A   Bypass A

|------] [----------]/[--------(  )

|

|

|  Bypass B Req.  Inhibit B   Bypass B

|------] [----------]/[--------(  )

|

|

|  Bypass C Req.  Inhibit C   Bypass C

|------] [----------]/[--------(  )

-Eric

Thank you, Eric