Mitsubishi Electric MELSEC iQ-R-R00CPU - Page 857

APPX
Appendix 5 List of Special Register Areas
855
A
*1 It is stored when used for the Ethernet function of CPU module.
*2 When the save destination for the event history is the data memory: the event history will be stored at the timing of powering off and on
and resetting the CPU module. Accordingly, since the data will be written into the data memory, "100" is stored. (When the save
destination for the event history is the SD memory, the initial value remains "0".)
*3 This is the memory used by the system when the CPU module is executing functions.
*4 The CPU module where the SD memory card can be used supports these special register areas.
*5 The CPU module where the extended SRAM cassette can be used supports these special register areas.
*6 There are restrictions on the firmware version of the supported CPU module and software version of the engineering tool. ( Page
1008 Added and Enhanced Functions)
SD644 Internal buffer free
area space
Internal buffer free
area space
Low-order (in K
bytes)
This register stores the following in K bytes: internal buffer free
space that is not set in the internal buffer capacity setting of the
CPU parameters.
S (Status
change)
Rn
SD645 Internal buffer free
area space
High-order (in K
bytes)
This register stores the following in K bytes: internal buffer free
space that is not set in the internal buffer capacity setting of the
CPU parameters.
S (Status
change)
Rn
SD648 Function memory
capacity
Function memory
capacity
Low-order (in K
bytes)
The capacity of the function memory is stored in K bytes. S (Initial) Rn
*6
SD649 Function memory
capacity
High-order (in K
bytes)
The capacity of the function memory is stored in K bytes. S (Initial) Rn
*6
SD650 Function memory free
space capacity
Function memory free
space capacity
Low-order (in K
bytes)
The amount of free space of the function memory is stored in K
bytes.
S (Status
change)
Rn
*6
SD651 Function memory free
space capacity
High-order (in K
bytes)
The amount of free space of the function memory is stored in K
bytes.
S (Status
change)
Rn
*6
SD652 Function memory
clear error cause
Function memory
clear error cause
An error cause detected at a request for clearing the function
memory is stored.
0: No error
Other than 0:For details on the values stored when an error occurs,
refer to the list of error codes. ( Page 703 List of error
codes)
The register is cleared to 0 at a request for clearing the function
memory.
S (Status
change)
Rn
*6
SD653 File transfer to data
memory error cause
File transfer to data
memory error cause
The error cause that is detected at file transfer to the data memory
is stored.
0: No error
Other than 0:For details on the values stored when an error occurs,
refer to the list of error codes. ( Page 703 List of error
codes)
The register is cleared to 0 when SM653 (File transfer to data
memory request) changes from off to on.
S (Status
change)
Rn
*6
No. Name Data stored Details Set by
(setting
timing)
CPU