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Exchanging Data with the CPU Unit
Section
3-3
118
Note
The Loop Control Unit can use the CPU Unit Terminal block or Expanded
CPU Unit Terminal block (regardless of the user program on the CPU Unit) to
read and write to any I/O memory on the CPU Unit. For this reason, do not
perform reading and writing in duplicate on the same I/O memory address
between the Loop Control Unit and the CPU Unit.
3-3-2-1
To exchange data at all times (CPU Unit Terminal block or Expanded
CPU Unit Terminal block)
The Loop Control Unit reads and writes data in any I/O memory on the CPU
Unit at all times (at each operation cycle) using the CPU Unit Terminal or
Expanded CPU Unit Terminal in the function block. Prepare the CPU Unit
Terminal or Expanded CPU Unit Terminal on CX-Process Tool, and
download the Terminal to the Loop Control Unit together with the other
function blocks.
Loop Control Unit
CPU Unit
CPU Unit Terminal
block
I/O memory
At each
operation
cycle
At each
operation
cycle
There are a total of eight CPU Unit Terminals and Expanded CPU Unit
Terminals as follows:
Category
Number of points
Function block
128 contact inputs
DI Terminal from CPU Unit (Block Model 451)
128 contact outputs DO Terminal to CPU Unit (Block Model 452)
8 word inputs
AI Terminal from CPU Unit (Block Model 453)
CPU Unit
terminal
8 word outputs
AO Terminal to CPU Unit (Block Model 454)
64 contact inputs
DI Terminal from Expanded CPU Unit (Block
Model 455)
64 contact outputs
DO Terminal to Expanded CPU Unit (Block Model
456)
64 word inputs
AI Terminal from Expanded CPU Unit (Block Model
457)
Expanded
CPU Unit
terminal
64 word outputs
AO Terminal to Expanded CPU Unit (Block Model
458)
The following table shows the addresses of I/O memory that can be read and
written by the CPU Unit Terminal or Expanded CPU Unit Terminal.
I/O memory that can be specified by the CPU Unit Terminal or
Expanded CPU Unit Terminal
Area type
CS1 Series CPU Unit
I/O memory address
Remarks
CIO (channel I/O)
Area
0000 to 6134 words
Including I/O Area, CompoBus/D
Area, Data Link Area, Special I/O
Unit Allocated Area (
1)
Work Area (W)
W000 to 511 words
Holding Area (H)
H000 to 511 words