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SCADAPack Digital Outputs are not coming ON, despite appearing energized in the logic

Regardless of the generation of SCADAPack and the programming software being used, there are two main situations where a coil or digital output may appear to be energized in logic but that the physical digital output and LED do not energize.

In all SCADAPacks, the physical I/O needs to be associated to an appropriate point in logic.

  • In RemoteConnect for a SCADAPack X70, the IO Configuration needs to have an Object associated with an IO Channel Configuring IO in RemoteConenct
  • In this image, the Object Association shows that PIO_SP474_DO1 is mapped to Channel DO1.  Note that Channel DO2 does not have any Object associated with it. So even if there was still an Object PIO_SP474_DO2 in the object database, it would not control the physical digital output in this circumstance.
  • Similarly, SCADAPack Workbench (for SP32 and SP3xx) uses the I/O Wiring to associate a variable name with a physical IO point
  • And finally, TelePACE Studio (for SP32 and SP3xx) uses the Register Assignment feature in order to map the physical IO to Modbus registers. A TelePACE Studio project without a suitable register assignment will not be able to monitor and control the physical IO.

In all SCADAPacks, the final step in a logic cycle is to update the physical outputs

  • In all varieties of SCADAPack, the logic generally follows this routine:
    • Read the current state of digital and analog inputs
    • Perform a scan of the logic
    • Update the digital and analog outputs
  • In a situation where a coil appears two or more times within the logic, the controller will update the physical digital output according to the last scanned instance.  For a TelePACE Studio example:, Network 1 shows that Coil 1 is energized but Network 2 shows that Coil 1 is de-energized. By observing Network 1, a technician might think that the digital output should be ON

Output 1 appears energized

  • But because of the coil state in Network 2, the physical digital output will remain OFF

the final occurrence of multiple coils is what actually controls the physical output

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