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DCC/EDC how to set different permissive for different states, eg Motor Left/Right - Star/Delta

Hi Forum

I struggle a bit around the DCC Permissive configuration together with an EDC.

Assume the motor has Left/Right mode and Star/Delta on a simple control module without EQM or Unit-Phase.

Operator shall be able to start a motor from Off to Left or Right in Star only. After 5 seconds in confirmed Star, the State for the same direction should be permitted to set to Delta or Off. Once in confirmed Deltav the only permissive for the motor shall be Off and not Star.

Once the motor run in any direction, It must be confirmed Off first for 10 seconds before the direction can change in Star first and then to Delta. 

The EDC can handle all this nice states, better than with a huge logic and the old DC. How to configure now the DCC Permissive for the above conditions? Provox Guys remeber a little bit the DCD Point with this EDC :)

If any of the Permissive condition is false then the DCC/P_OUT_D is false. This is normal because only one of the permissive conditions will be true. Solong as EDC/PERMISSIVE_D is 1 then I still can change to any other state, with the EDC/DEVICE_OPT:Permissive to any state.

So, How does the EDC know which DCC Permissive or State is valid?

Actual I have following configured in the Permissive conditions of the DCC:

CND1 : Off State : '^/EDC1/PV_D.CV' > 0

CND2 : Left Star : '^/EDC1/PV_STATE.CV' = '$edc_pv_states_MLR:Confirmed OFF'  with Delay on = 10

CND3 : Left Delta : '^/EDC1/PV_STATE.CV' = '$edc_pv_states_MLR:Confirmed LEFT STAR' with Delay On 5

CND4 : Right Star : '^/EDC1/PV_STATE.CV' = '$edc_pv_states_MLR:Confirmed OFF' with Delay on = 10

CND5 : Right Delta : '^/EDC1/PV_STATE.CV' = '$edc_pv_states_MLR:Confirmed RIGHT STAR'

Sure can I do now create a bunch of Logic round but Why it don't work with the DCC/EDC combination?

Thank You for Help and Best Regards, Michael

• EDC
• Permissive
• DCC

Michael Krispin

• 12 May 2026 4:31 PM
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4 Replies

• Matt Stoner

  

  • 12 May 2026 5:15 PM

  You can set the RESTART_TIME to 10 and any change from Left to Right (Active to Active states) will go to Off (Passive) for 10 secs without any conditions or special configuration. No delay when going to the passive state.

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• Michael Krispin

  

  • 12 May 2026 6:19 PM

  In reply to Matt Stoner:

  Hi Matt,
  Thank You for your fast response, but it do not hit the requirements. There are 4 active states, 2 for Left turn and 2 for right turn. A motor in Star/Delta starts in Start due to avoid too high current at start for some seconds before it switch to full power in Delta. It do not help to start in Star, then Off then Delta. The Motor must run immidiately from Star to Delta. And a change of the direction from Left to Right should be disallow, but not Interlocked. There should be only permissive to set the right SP.
  BR Michael

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• Matt Stoner

  

  • 12 May 2026 6:49 PM

  In reply to Michael Krispin:

  If that is the case you will have to develop a custom FP to limit the individual states to do this because there isn't Permissives per state option like other control systems have, only "To Any Active State" or "To Any State" OR develop you're own composite to replace the DC/EDC block unfortunately.

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• Douglas Crowder

  

  • 12 May 2026 6:53 PM

  In reply to Matt Stoner:

  I agree. This seems to exceed the functionality of DCC/EDC. Use composites for re-usability and to "hide" the complexity.

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