Equality; Redundancy; Eno And Power Flow To The Right - GE PACSystems RX7i Cpu Programmer's Reference Manual

Chapter 6. Service Request Function

6.33.11 Equality

Because data in nonvolatile storage is not considered part of the project, writing to nonvolatile
storage does not impact equality between the CPU and Logic Developer.

6.33.12 Redundancy

Redundancy systems can benefit from the use of logic driven user nonvolatile storage as long as all
of the references saved to nonvolatile storage are included in the transfer lists. Each redundancy
CPU maintains its own separate logic driven user nonvolatile storage by means of SVC_REQ 57
during its logic scan. If the values of reference addresses to be stored to user nonvolatile storage are
synchronized, the logic driven user nonvolatile storage data in each CPU is identical. If the values to
be stored are not synchronized, then each CPU's user nonvolatile storage may be different.

6.33.13 ENO and Power Flow to the Right

If the status is Success or Partial Read, then on the SVC_REQ instruction, ENO is set to True in FBD
and ST, and power flow passes to the right in LD.
338 PACSystems* RX7i, RX3i and RSTi-EP CPU Programmer's Reference Manual GFK-2950C