1-1-12 Internal Mechanism Of Loop Controllers - Omron SYSMAC CS1W-LCB01 Operation Manual

Outline
Note
Data direction
I/O memory area type Reading or writing at CPU Unit
on CPU Unit Terminals, Expanded CPU Unit
Terminals, or Send/Receive All
Blocks
❍ : Possible,
---: Impossible
❍
CIO
❍
Work Area (W)
❍
Holding Area (H)
Auxiliary Area ---
TR Area ---
Timer ---
Counter ---
Data Memory Area (D) ❍
❍ (bank No.0 only)
Extended Data Mem-
ory Area (E)

1-1-12 Internal Mechanism of Loop Controllers

Relationship between CPU Unit I/O Memory and Loop Controller
The Loop Controller can read from and write to CPU Unit I/O memory by the
methods indicated in the following table.
Purpose of data on Loop Controller
Loop Controller
↔ CPU Unit
Reading or writing at field ter-
minals
Reading/writing of CIO area on
corresponding Unit at field ter-
minals
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The following describes the internal mechanism of the Loop Controller.
• Function block data and error log data are backed up by a super capacitor
in RAM. During actual operation, the Loop Controller uses the data in
RAM.
• Function block data is prepared and downloaded to RAM and flash mem-
ory in the Loop Controller from CX-Process Tool running on the computer.
From the CX-Process Tool, you can transfer data between RAM and flash
memory whenever necessary.
• Error log data is stored in flash memory can be read using the READ
ERROR LOG FINS command (command code 2102 Hex).
• In the default state, function block data is not stored on the Loop Control-
ler. Function block data must be downloaded from a computer to RAM
and flash memory in the Loop Controller before the Loop Controller can
be run.
Loop Controller
↔ CPU Unit
Writing using the Auxiliary
Area
Notifying of Loop Controller
status
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Section 1-1
Loop Controller
→ CPU Unit
23