DVC6000f Digital Valve Controllers
December 2009
4-118
Figure 4-18. Output Splitter Function Block Schematic
RCAS_IN
OUT 1
CAS_IN
OUT 2
RCAS_OUT
CAS_OUT
BKCAL_IN_2
BKCAL_IN_1
IN_ARRAY
OUT_ARRAY
LOCKVAL
SP
Auto
Figure 4-19. Output Splitter Function Block Schematic Diagram
Setpoint
Limiting
OUT 1
CAS_IN
OUT 2
BKCAL_OUT
BKCAL_IN_1
IN_ARRAY
BAL_TIME
LOCKVAL
SP
Setpoint
Rate
Limiting
Calculate
Ouput
Balance
Ouput
Balance
Ouput
Shed
Mode
BKCAL_IN_2
MODE
SP_WRK
OUT_ARRAY
SP_RATE_DN
SP_RATE_UP
When a BKCAL_IN input sees that its downstream
block is not in Cas mode, the Splitter function block
sets the corresponding OUT value to the BKCAL_IN
value. However, this may not be the same value that
is calculated by the splitter algorithm. When the mode
of the downstream block is changed to Cas, the
difference between the calculated output and the
back-calculation input is computed and the difference
is added to the calculated output. Next, the difference
is reduced to zero over the time defined by the
BAL_TIME parameter.
When both BKCAL_IN_1 and BKCAL_IN_2 indicate
that the downstream blocks are not in Cas mode or
have Bad status, the first downstream block that goes
to Cas mode causes the upstream block to initialize so
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