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Outline
Section
1-1
18
Data Exchange with CX-Process Monitor and Loop Control Units at
Other Nodes (by Node Terminal block)
The Data Memory for node terminals is allocated to the CPU Unit Data
Memory area comprising the following two areas:
-1 Data exchange area with CX-Process Monitor
-2 Data exchange area with Loop Control Unit at other node
For either area, the Node Terminal block is used for performing data
exchange constantly (at each operation cycle) with CX-Process Monitor or
Loop Control Units at other nodes.
Reading of Error Log Data on Loop Control Unit
Error log data is stored on the Loop Control Unit. (The error code, detailed
information, date (year/month) and time (hour/minute/second) of occurrence
are recorded as one error log data record, and the latest 256 data records
are stored.) Error log data can be read using the read error log FINS
command (command code 2102 Hex).
Note
Relationship between CPU Unit I/O Memory and Loop Control Unit
The Loop Control Unit can read from and write to CPU Unit I/O memory by
the methods indicated in the following table.
Purpose of data on Loop Control Unit
Data direction
Loop Control Unit
CPU Unit
Loop Control Unit
CPU Unit
Loop Control Unit
CPU Unit
Loop Control Unit
CPU Unit
I/O memory area
type on CPU Unit
Reading or writing
at CPU Unit
Terminals,
Expanded CPU
Unit Terminals, or
Send/Receive All
Blocks
: possible,
: impossible
Reading or writing
at field terminals
Writing at data
memory for node
terminals
Writing using
allocated area for
CPU Bus Unit
CIO
Reading/writing of
CIO area on
corresponding
unit at field
terminals
Notification of
Loop Control Unit
status
Work Area (W)
Holding Area (H)
Auxiliary Area
Temporary Relay
Area
Tmer
Counter
Data Memory
Area (D)
Up to 3836 words
allocated for use
for CX-Process
Monitor
Extended Data
Memory Area (E)
(bank No.0
only)