Omron CS1W-LC001 Operation Manual page 180

Examples of Applied Control Types
Example
Analog
input
Analog
input
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.
Set Point
+
SP1
−
PV1
PID1
PV1
PV2
022
PV1
021
MV1 Set Point
SP2
+
PID1 PID2
−
PV2
Secondary loop
Primary loop
RSP2
PID2
PV2
MV 1
MV 2
Advanced PID
<Block Model 012>
Address 001
PV
MV1
006 087
Disturbance
MV2
Primary
Secondary
process
process
characteristics
characteristics
Advanced PID
<Block Model 012>
Address 002
PV2
006 087
SP2
021
Bumpless
032
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).
Section 5-2
Control
output
Analog
output
MV2
021
163