Appendix 3 Special Relays - Mitsubishi Electric MELSEC iQ-R16MTCPU Programming Manual

Appendix 3
Special relays are internal relays whose applications are fixed in the Motion CPU. For this reason, they cannot be used in the
same way as the normal internal relays by the Motion SFC programs. However, they can be turned ON/OFF as needed in
order to control the Motion CPU.
The headings in the table that follows have the following meanings.
Item
No.
Name
Data stored
Details
Set by (setting timing)
No. Name
SM0 Latest self
diagnostics error
SM1 Latest self
diagnostics error
SM4 Warning detection
SM50 Error reset
SM53 AC/DC DOWN
SM56 Instruction execution
fault
SM61 I/O module verify
error
SM80 Detailed information
1: Flag in use
SM112 Detailed information
2: Flag in use
SM203 STOP contact
APPENDICES
426

Appendix 3 Special Relays

Special Relays
Description
Indicates the device No. of the special relay.
Indicates the name of the special relay.
Indicates the data stored in the special relay and its meaning.
Indicates detailed information about the data stored in the special relay.
Indicates whether the relay is set by the system or user, and, if it is set by system, when setting is performed.
<Set by>
• S: Set by system (Motion CPU).
• U: Set by user (Motion SFC program or test operation using MT Developer2).
• U/S: Set by both user and system (Motion CPU).
<Setting timing>
• Main process: Set during main processing (free time processing of the CPU).
• Initial process: Set only during initial processing (when power supply is turned ON, or when reset).
• Status change: Set only when there is a change in status.
• Error: Set when error has occurred.
• Request: Set only when there is a user request (Special relay, etc.).
• Write: Set when there is writing from a user.
• Operation cycle: Set during each operation cycle of the Motion CPU.
Data stored Details
OFF: No error • Turn ON if an error occurs as a result of self-diagnosis.
ON: Error • Remains ON even if the condition is restored to normal thereafter.
• After confirming the error details, turn OFF by "Error reset (SM50)" ON
OFF: No self diagnostic • Turn ON if an error occurs as a result of self-diagnosis.
error • Remains ON even if the condition is restored to normal thereafter.
ON: Self diagnostic error • After confirming the error details, turn OFF by "Error reset (SM50)" ON
OFF: No warning • Turn ON if a warning occurs as a result of self-diagnosis.
ON: Warning • Remains ON even if the condition is restored to normal thereafter.
• After confirming the error details, turn OFF by "Error reset (SM50)" ON
OFF to ON : Error reset • Error is reset at OFF to ON.
request • Turns ON to OFF when error reset is complete.
ON to OFF: Error reset
complete
OFF: AC/DC DOWN not • Turn ON if an instantaneous power failure of within 20[ms] occurs
detected
ON: AC/DC DOWN
detected • Turn ON if an instantaneous power failure of within 10[ms] occurs
OFF: Normal • Turn ON if an instruction execution error type error occurs.
ON: Instruction execution • Remains ON even if the condition is restored to normal thereafter.
error
OFF: Normal • Turn ON if the I/O module status differs from that registered when the
ON: Error
• Remains ON even if the condition is restored to normal thereafter.
OFF: Not used "Turns ON if there is any detailed information when "Latest self
ON: Used diagnostics error (SM0)" turns ON.
OFF: Other than STOP Turns ON when the status is STOP.
status
ON: STOP status
to OFF except for the stop error.
to OFF except for the stop error.
to OFF except for the stop error.
during use of the AC power supply module. Reset when the power
supply is switched OFF, then ON.
during use of the AC power supply module. Reset when the power
supply is switched OFF, then ON.
power was turned ON.
Set by
(setting
timing)
S (Error)
U/S (Status
change)
S (Error)
S (Status
change)