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Outline
Section
1-1
9
1-1-5
Loop Control Unit Mechanism
Overall Mechanism
The following illustration shows a block diagram of the overall mechanism.
Loop Control Unit
Control block
Operation block
Step Ladder
Program block
F
ie
ld T
e
rm
in
al
s
CP
U
T
e
rm
in
a
ls
N
o
de T
e
rm
in
a
ls
CPU Unit
I/O
memory
Analog
Input/Output Unit
Basic I/O Unit
Data
Memory
for Node
Terminals
Computer
Loop Control Units at
other node
CMND
User Program
Ex: Wiring of ITEM
data in operation
blocks using FINS
commands
Input 1 of Analog
Input Unit
Input 2 of Analog
Input Unit
Field Terminal
block
Analog
Input
Analog
input
Field Terminal
block
Addition
/Subtrac
-tion
Output of Analog
Output Unit
Field Terminal
block
Analog
output
PID
Control block
All functions are achieved by software wiring between any combinations of function blocks.
Operation block
∗
1
∗
1
∗
1: Data is exchanged via
allocated relay Area on
the CPU Unit