4

CJ1G-CPU4

@P

Function Specifications

Item

Description

Operation method

Function block method

Number of

function

blocks

Total

CJ1G-CPU42P: 71 blocks max., CJ1G-CPU43/44/45P: 501 blocks max.

Analog

operation

Control

Blocks

PID and other control functions

LCB01: 50 blocks max.,

LCB03: 300 blocks max.

Operation

Blocks

Alarm, square root operation, time operations, pulse train

operation, and other operation functions for various processes

Sequential

Control

Step

Ladder

Program

block

Logic sequence and step sequence functions

4,000 commands max.

100 commands/1 block max.

Can be divided into 100 steps max.

100 commands/1 step max.

I/O block

Field

Terminal

block

Analog I/O function with Analog I/O Unit, contact I/O function

with Basic I/O Unit

80 blocks max.

User link

tables

Analog data I/O and contact data I/O function for CPU Unit

Can be added to CSV tags.

2,400 data max.

HMI

function

I/O function for function block ITEM data for Control, Operation,

External Controller, and System Common blocks for CPU Unit

Control/Operation Blocks

LCB01: 50 blocks max. + 20

send/receive words

LCB03: 300 blocks max. + 20

send/receive words

System Common Block

20 send/receive words

Real PV Input Monitor Area

LCB01: 50 words max.

LCB03: 300 words max.

System Common block

System common operation cycle setting, run/stop command,

load rate monitor, etc.

Single block

Function block data preparation/

download

Function block data prepared by CX-Process Tool (sold separately) and downloaded to Loop Controller

Execution

of

function

blocks

Function

block

execution

conditions

Common

to all

function

blocks

• Operation of all function blocks by turning power ON to the PLC (Hot or cold start can be specified.) For

cold starts, function block data is transferred from flash memory to RAM.

• Function block operation can be stopped by CX-Process Tool or FINS command.

• Hot start (state active before Board was stopped is continued before operation is started) or cold start

(all state signals and function block internally held values are cleared before operation is started) is

possible by CX-Process Tool or FINS command.

For

individual

function

block

Function block operation can be stopped and hot start (state active before Unit was stopped is continued

before operation is started) is possible by CX-Process Tool or FINS command.

Function block

operation cycle

Standard: Operation of all function blocks is executed at the same operation cycle preset to ITEM 004 in

the System Common block.

Settable operation cycles: 0.1 s, 0.2 s, 0.5 s, 1 s, 2 s (default: 1 s)

Note: Cannot be set to the same operation cycle for some function blocks.

Option: Operation of individual function blocks is executed at the same operation cycle preset to ITEM 004

in the System Common block.

Settable operation cycles: 0.01 seconds, 0.02 seconds, 0.05 seconds, 0.1 seconds, 0.2 seconds,

0.5 seconds, 1 second, and 2 seconds (default: 1 second)

Note: The external I/O response cycle on a single control loop does not necessarily match the operation

cycle. The response cycle is heavily dependent on the CPU Unit's cycle time. (See the external I/O

response cycle item below.)

Function blocks

supporting

high-speed operation

The following operation cycles can be set for the blocks listed below: 0.01, 0.02, and 0.05 s.

Control/Operation blocks: Block Models 016, 150, 151, 155 to 157, 167, 182 to 184, 186, and 221 to 224

Sequence control and Field Terminal blocks

Execution

of

function

blocks

LCB load rate

The "LCB load rate" refers to the ratio between the actually applied execution time and preset operation

cycle.

The maximum value and current value are displayed for each operation cycle group on the CX-Process

Tool.

A LCB load rate of 80% or less is required in all operation cycle groups.

When the load rate exceeds 80% for 6 seconds, the LCB load rate automatically changes to the next

longer operation cycle. (This is called the "automatic operation cycle switching function.")

Note: The High Load Alarm Flag (A42408) turns ON if the load rate exceeds 80% for 6 seconds

consecutively (non-fatal Inner Board error). (If execution is not possible within the operation cycle,

the operation cycle will be extended.) If this happens, select the function blocks that can have longer

operation cycles and increase their operation cycles. If the load rate is still too high, processing of

the function blocks must be separated for processing by additional Loop Control Units.

External I/O response cycle

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.