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Specifications
Section
1-3
38
1-3-3 Function
Specifications
Item
Description
Operation method
Function block method
Number of function blocks
Total: Max. 727 blocks
Control
Blocks
PID and other control functions
Max. 32 blocks
Operation
Blocks
Alarm, square root operation,
time operations, pulse train
operation, and other operation
functions for various processes
Max. 250 blocks
Analog
operation
External
Controller
Block
Monitoring and setting functions
for external controllers
Max. 32 blocks
Step Ladder Program
block
Logic sequence and step
sequence functions
Max. 4000 commands
Max. 100 commands/1 block
Can be divided into max. 100
steps
Max. 100 commands/1 step
Field Terminal
block
Analog I/O function with Analog
I/O Unit, contact I/O function with
Basic I/O Unit
Max. 80 blocks
I/Ot
block
CPU Unit
Terminal block
Analog data I/O and contact I/O
functions with CPU Unit
Max. 16 blocks
Expanded
CPU Unit
Terminal block
Analog data I/O and contact I/O
functions with CPU Unit (direct
I/O with other function block
possible)
Max. 32 blocks
Send/Receive
All Blocks
blocks
Allocating words in the CPU Unit
for data transfer with standard
SCADA
Max. 2 blocks
Node Terminal
block
Send to computer
Max. 32 blocks
Send to networked PC
Max. 50 blocks
Receive from networked PC
Max. 100 blocks
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 Control Unit
Func-
tion
block
execu-
tion
condi-
tions
Common
to all
function
blocks
- Operation of all function blocks by turning power ON to the PC (Hot or cold start can be
specified.)
- Function block operation can be stopped by CX-Process Monitor, CX-Process Tool, or
FINS command.
- Hot start (state active before unit 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 Monitor, CX-Process Tool or FINS
command.
For indivi-
dual
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 Monitor, CX-
Process Tool or FINS command.
Execu-
tion of
function
blocks
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)
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: 0.1 s, 0.2 s, 0.5 s, 1 s, 2 s (default: 1 s)
Note 1:
Note, however, that the external I/O refresh cycle on a single control loop does
not match this operation cycle. This refresh cycle is heavily dependent on the
CPU Unit’s cycle time. (See the external I/O refresh cycle item below.)
Note 2:
In the case of the Field Terminal, CPU Unit Terminal, Expanded CPU Unit
Terminal and Node Terminal function blocks for exchanging data with the CPU
Unit, a cycle time approximately 3.3 times or more of the CPU Unit’s cycle time
is required in most cases.