Mitsubishi Electric MELSEC iQ-R C R12CCPU-V, User Manual

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APPX
Appendix 5 Special Relay List
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Appendix 5
Special Relay List
The following shows how to read the list of special relay (SM).
Do not change the special relay set by system with the operations such as program execution or device test.
Doing so may result in system down or disconnection of communication.
Diagnostic information
The special relays for diagnostics information are as follows.
Item Description
No. Indicates the number of the special relay.
Name Indicates the name of the special relay.
Content Indicates the content of the special relay.
Details Indicates the details of the special relay.
Set by (when to set) Indicates the timing to set each device by system and/or user.
(Set by)
S: Set by system
(When to set)
• Initial: Data is set only when initial processing is performed (e.g. powering ON the system, changing the operating
status from STOP to RUN).
• Error occurrence: Set if an error occurs.
• Status change: Set only when the status is changed.
• At END processing: Set for every refresh cycle.
No. Name Content Details Set by (when to set)
SM0 Latest diagnostics error OFF: No error
ON: Error Turns ON when the diagnostics error occurred. The ON
state is retained even after the error is cleared later. S (at error occurrence)
SM1 Latest self-diagnostic error OFF: No error
ON: Error Turns ON when the self-diagnostics error occurred. The
ON state is retained even after the error is cleared later. S (at error occurrence)
SM53 AC/DC DOWN OFF: AC/DC DOWN not
detected
ON: AC/DC DOWN
detected • Turns ON when a momentary power failure within 20
ms is detected while the AC power supply module is in
use. This relay is reset after the power is turned OFF
and ON.
• Turns ON when a momentary power failure within 10
ms is detected while the DC power supply module is in
use. This relay is reset after the power is turned OFF
and ON.
S (at error occurrence)
SM60 Blown fuse detection OFF: Normal
ON: Module with blown
fuse • Turns ON when at least one output module is in fuse
blown state. The ON state is retained even after the
error is cleared later.
• The fuse blown state check is also performed for output
modules on the remote I/O station.
S (at error occurrence)
SM61 I/O module verify error OFF: Normal
ON: Error • Turns ON when the state of the I/O module is different
from the one registered during power ON. The ON state
is retained even after the error is cleared later.
• I/O module verification is also performed for modules
on the remote I/O station.
S (at error occurrence)
SM80 Detailed information 1 in-
use flag OFF: Not used
ON: In use Turns ON if the detailed information 1 exists when SM0
turns ON. S (status change)
SM112 Detailed information 2 in-
use flag OFF: Not used
ON: In use Turns ON if the detailed information 2 exists when SM0
turns ON. S (status change)
SM600 Memory card usable flag OFF: Unusable
ON: Usable Turns ON when the module is in SD memory card
available state. (The flag turns ON after inserting an
applicable SD memory card and it is in the available
state.) S (status change)
SM601 Memory card protect flag OFF: Not protected
ON: Protected Turns ON when the write protect switch of the SD
memory card is ON S (status change)
SM603 Memory card (drive 2) flag OFF: Not inserted
ON: Inserted Turns ON while an SD memory card is inserted.
(Regardless of the availability of the SD memory card and
its type.) S (status change)