Reference Manual
00809-X0100-4793, Rev CA
August 2004
4-7
Rosemount 8742C
Cascade Control
Cascade control applications require two inputs. The configuration is to link
the output of one AI block into the PID block in the 8742C transmitter and to
link the AI block of a second 8742C transmitter into the PID block of that
transmitter. Another set of links between the second PID and the AO block,
located in the control valve, is required (see Figure 4-4).
Figure 4-4. Cascade Control
Configuration
AO
PID2
PID
AI2
AI1
Macro Cycle
BKCAL_IN
OUT
IN
AI
Block 2 (AI2)
from second
8742C
Transmitter
OUT
OUT
IN
IN
Flow
IN
PID Block 2
(PID2) from
second 8742C
Transmitter
CAS_IN
PID Block 1
(PID1)
AI
Block 1 (AI1)
Transducer
Block
OUT
BKCAL_IN
BKCAL_OUT
CAS_IN
AO Block
BKCAL_OUT
FBUS_46A
Содержание 8700 Series
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