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Loop-control CPU Units
Loop Controller Element Specifications
Item
Model
Operation method
Loop Controller element
Function
Control and
block analog
operation
operations
blocks
Sequence
Step ladder
control
program
blocks
I/O blocks
Field terminal
blocks
User link
tables
HMI function I/O function for the speci-
System
Common
block
Method for creating and transferring function blocks
External I/O response time
Operation cycle
Internal operation
Control method
Alarms
CJ1G-CPU42P
Function block method
LCB01
PID and other control
50 blocks max.
functions, square root op-
eration, time operations,
pulse train operation, and
other operation functions
for various processes.
Logic sequence and step
20 blocks max.
sequence functions
2,000 commands total
100 commands max. per block
Separable into 100 steps max.
Analog I/O function with
30 blocks max.
Analog I/O Unit, contact
I/O function with Basic I/O
Unit
Analog data I/O and con-
2,400 data items max.
tact data I/O function for
CPU Unit
Allocated 1 EM Area bank
fied bank of the EM Area
Operation and Control blocks:
50 blocks max. × 20 send/receive words
in the CPU Unit for func-
tion block ITEM data used
for Control, Operation,
System Common blocks:
External Controller, and
20 send/receive words
System Common blocks
for the HMI function.
System common opera-
Single block
tion cycle setting, run/
stop command, load rate
monitor, etc.
Created using CX-Process Tool (purchased separately) and transferred to Loop
Controller.
The time from external input of analog signals up to external output of analog signals
on a single control loop depends on the function block's operation cycle and the
CPU Unit's cycle time.
0.01, 0.02, 0.05, 0.1, 0.2, 0.5, 1, or 2 s (default: 1 s) (See note.)
Can be set for each function block.
Note: 0.01, 0.02, and 0.05 s cannot be set for some blocks.
Number of control loops
• The maximum number of loops that can be used if the LCB load rate is 80% for a
standard applications (e.g., with each loop consisting of one Ai4 Terminal, Seg-
ment Linearizer, Basic PID, and A04 terminal) is shown in the following table.
Note: Loop Controller element LCB01: 25 loops max.
PID control method
PID with 2 degrees of freedom
Control combinations
Any of the following function blocks can be combined:
Basic PID control, cascade control, feed-forward control, sample PI control, Smith
dead time compensation control, PID control with differential gap, override control,
program control, time-proportional control, etc.
PID block internal alarms 4 PV alarms (upper upper-limit, upper limit, lower limit, lower lower-limit) and 1
deviation alarm per PID block
Alarm blocks
High/low alarm blocks, deviation alarm blocks
Loop Controller Element Specifications
Specifications
Operation
Maximum number
cycle
of loops
0.01 s
20 loops
0.02 s
35 loops (see note) 0.5 s
0.05 s
70 loops (see note) 1 s
0.1 s
100 loops (see note) 2 s
CJ1G-CPU43/44/45P(-GTC)
LCB03
300 blocks max.
200 blocks max.
4,000 commands total
100 commands max. per block
Separable into 100 steps max.
CJ1G-CPU43P: 30 blocks max.
CJ1G-CPU44/45P: 40 blocks max.
Allocated 1 EM Area bank
Operation and Control blocks:
300 blocks max. × 20 send/receive words
System Common blocks:
20 send/receive words
Operation
Maximum number
cycle
of loops
0.2 s
150 loops
(See note.)
11
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