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Examples of Applied Control Types
Section
5-2
163
Note 2
In cascade control, when the secondary loop PID2 is set to Local, MV1 of the
primary loop PID1 must be tracked to changes on the Local Set Point setting
(LSP2) (matched to LSP2).
This Loop Control Unit is provided with a bumpless MV tracking function on
the primary and secondary sides during cascade processing in ITEM032
(bumpless processing between primary/secondary loops) in the Basic PID
block (Block Model 011) and Advanced PID block (Block Model 012). The
primary side MV1 is overwritten with the Local Set Point of the self node
when the secondary side is local merely by setting 1 (bumpless processing
ON) to ITEM032 of the Basic PID or Advanced PID block on the secondary
side.
PID1
Secondary
process
characteristics
+
−
PV1
Control
output
PID2
+
−
Primary
process
characteristics
Set Point
SP2
MV1
PV2
MV2
Secondary loop
Primary loop
Disturbance
Set Point
SP1
Example
PID2
PV1
MV 1
PID1
MV 2
PV2
RSP2
Analog
input
Analog
input
Analog
output
022
PV2
006
PV2
Advanced PID
<Block Model 012>
021
032
087
MV2
006
Advanced PID
<Block Model 012>
Address 001
087
PV
MV1
SP2
PV1
021
021
Bumpless
processing
∗
1
∗
1: The self node overwrites the actual Local Set Point 2
value with primary side MV1 when the self node is the
local node by setting bumpless output to 1 (ON).
Address 002