Appendix 4 List Of Special Register (Sd) Areas - Mitsubishi Electric MELSEC iQ-R Series User Manual

Appendix 4
The following table shows how to read the special register (SD) list.
Item
No.
Name
Data stored
Details
Set by (setting timing)
Do not change the values of special register set by the system by an engineering tool. Doing so may result in
system down or communication failure.
Diagnostic information
The following table lists the special register areas relating to the diagnostic information.
No. Name
SD0 Latest self-
diagnostic
error code
SD1 Latest self-
diagnostic
error time
SD2
SD3
SD4
SD5
SD6
SD7
APPX
148

Appendix 4 List of Special Register (SD) Areas

List of Special Register (SD) Areas
Description
Special register number
Special register name
Data stored in the special register
Detailed description of the data stored
Set side of data (system or user) and timing when data is set by the system
<Set by>
• S: System
• U/S: User and system
<Set timing>
• Always: Data is regularly set.
• Every END: Data is set every time END processing is performed.
• Initial: Data is set when initial processing is performed (e.g. powering on the system, changing the operating status from
STOP to RUN).
• Status change: Data is set when the status is changed.
• Error: Data is set when an error occurs.
• Request: Data is set when requested by a user (using the special relay).
• Switch change: Data is set when the switch of the remote head module is changed.
• Writing: Data is set when a user performs a writing operation.
• Cause occurrence: Data is set when the system switching cause occurs by the system.
• System switching: Data is set when two systems are switched (between the control system and the standby system)
Description Details
Latest self- Error codes are stored in a hexadecimal value when the diagnostics detects an error.
diagnostic
error code
Latest self- The year value (four digits) of the date/time when data of 'Latest self-diagnostic error
diagnostic code' (SD0) was updated is stored as a BIN code.
error time
The month value of the date/time when data of 'Latest self-diagnostic error code'
(SD0) was updated is stored as a BIN code.
The day value of the date/time when data of 'Latest self-diagnostic error code' (SD0)
was updated is stored as a BIN code.
The hour value of the date/time when data of 'Latest self-diagnostic error code'
(SD0) was updated is stored as a BIN code.
The minute value of the date/time when data of 'Latest self-diagnostic error code'
(SD0) was updated is stored as a BIN code.
The second value of the date/time when 'Latest self-diagnostic error code' (SD0)
was updated is stored as a BIN code.
The day of week value of the date/time when 'Latest self-diagnostic error code'
(SD0) was updated is stored as a BIN code. (0: Sun, 1: Mon, 2: Tue, 3: Wed, 4: Thu,
5: Fri, 6: Sat)
Set by (setting
timing)
S (Error)
S (Error)