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CHAPTER 6 COMMUNICATIONS AMONG CPU MODULES
6
6.1 Communications Using the CPU Shared Memory
(3) Host CPU operation information area
(a) Information stored
The following information about the host CPU module is stored in this area.
*1
In a single CPU system, all the values are set to 0.
*1 Motion CPUs do not use the areas 5
H
to 1C
H
.
If data in the areas 5
H
to 1C
H
are read from a Motion CPU, the data will be read as "0".
*2 For details, refer to the description of the corresponding special register areas in the User's Manual (Hardware Design,
Maintenance and Inspection) for the CPU module used.
(b) Reading data
Other QCPUs in the multiple CPU system can read data in the host CPU operation information area by
executing the FROM instruction or the instructions using the cyclic transmission area device (U3En\G).
Use the read data for monitoring purposes only because there is a delay in updating data.
Shared
memory
address
Name Meaning
Description
*2
Corresponding
special register
0
H
Information
existence
Information
existence flag
This is an area to check whether information is stored in the
host CPU operation information area (1
H
to 1F
H
).
• 0: Information not stored
• 1: Information stored
–
1
H
Diagnostic error
Diagnostic error
code
The error code of an error detected by the diagnostics is
stored in binary.
SD0
2
H
Clock time for
diagnosis error
occurrence
Clock time for
diagnosis error
occurrence
The year and month when the error code was stored in the
CPU shared memory (address: 1
H
) are stored in 2-digit
BCD.
SD1
3
H
The day and hour when the error code was stored in the
CPU shared memory (address: 1
H
) are stored in 2-digit
BCD.
SD2
4
H
The minute and second when the error code was stored in
the CPU shared memory (address: 1
H
) are stored in 2-digit
BCD.
SD3
5
H
Error information
category code
Error information
category code
A category code indicating an error information type (error
common information or error individual information) is
stored.
SD4
6
H
to
10
H
Error common
information
Error common
information
The common information corresponding to the error code is
stored.
SD5
to
SD15
11
H
to
1B
H
Error individual
information
Error individual
information
The individual information corresponding to the error code
is stored.
SD16
to
SD26
1C
H
Not used – Use prohibited –
1D
H
Switch status
Switch status of a
CPU module
The switch status of the CPU module is stored. SD200
1E
H
LED status
LED status of a
CPU module
The LED status of the CPU module is stored. SD201
1F
H
CPU operating
status
Operating status of
a CPU module
The operating status of the CPU module is stored. SD203