5
Outline Section 1-1
Loop-control CPU
Units
Loop Control Boards are built into the CJ1 CPU. The following table shows
available Loop-control CPU Unit models.
Unlike Loop Control Boards (CS1W-LCB01/05), Loop-control CPU Units have
the following restrictions.
• External Controllers (ES100X Controller Terminal (Block Model 045)) are
not supported.
• Sequence tables are not supported.
1-1-2 Features
Common Features of
Loop Controllers
High-speed Execution of Function Blocks for Multi-loop Control with an
Operation Cycle of 10 ms
Function blocks are executed at high speed approximately ten times faster
than for the Loop Control Units. For example, with a standard loop containing
an Ai4 Terminal, a Segment Linearizer, a Basic PID, and an Ao4 Terminal
block, 20 loops can be executed in 10 ms (except for the CS1D-CPU@@P).
All Functions Achieved by Using Only Function Blocks (Operation
Functions/Designation of Field Input/Output)
Wiring function blocks in the software allows you to achieve not only combina-
tions of operation blocks but also all functions including specification of field
I/O.
Almost All Control Types Freely Achieved by Combining Function Blocks
In addition to regular PID control, cascade control, feedforward control, dead
time compensation control, override control and other special control types
can be achieved as desired by combining function blocks for up to 250 loops
for the LCB03, LCB05, and LCB05D or 50 loops for the LCB01. Control can
also be easily configured for processes with prolonged dead time, non-linear
processes, and processes involving fluctuating loads. Changes in control type
after start of operation can also be flexibly accommodated.
Function Blocks with High-speed Execution
Operation cycles for control, operation, and other function blocks can be set to
10 ms, 20 ms, or 50 ms as well as to longer periods. The shortest operation
cycle that could be set for Loop Control Units was 100 ms. With faster execu-
tion, for example, four loops of PID control can all be executed in a 10-ms
operation cycle.
Model Block name Number of
control and
operation
blocks
Step Ladder
Programs
Remarks
CPU Unit Loop
Controller
component
CJ1G-CPU42P CJ1G-CPU42H LCB01 50 blocks max. 20 blocks max. Select the CJ1G-
CPU42H as the PLC
type from the
Programming Device.
CPU Unit program
capacity: 60 Kwords
CJ1G-CPU43/44/45P CJ1G-CPU43/44/45H LCB03 300 blocks max. 200 blocks max. Select the CJ1G-
CPU@@H as the PLC
type from the Program-
ming Device.
CPU Unit program
capacity: 250 Kwords