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Appendix 3 SPECIAL RELAY LIST
*1: This applies to the CPU of function version B or later.
TableApp.3.3 Special relay
Number Name Meaning Explanation
Set by
(When Set)
Corres-
ponding
ACPU
M9
Corresponding
CPU
SM255
MELSECNET/10,
MELSECNET/H
module 1 information
OFF : Operative network
ON : Standby network
• Goes ON for standby network(If no designation has
been made concerning active or standby, active is
assumed.)
S (Initial) New
Qn(H)
QnPH
QnPRH
SM256
OFF : Reads
ON : Does not read
• For refresh from link to CPU module (B, W, etc.)
indicate whether to read from the link module.
UNew
SM257
OFF : Writes
ON : Does not write
• For refresh from CPU module to link (B, W, etc.),
designate whether to write to the link module.
UNew
SM260
MELSECNET/10,
MELSECNET/H
module 2 information
OFF : Operative network
ON : Standby network
• Goes ON for standby network
(If no designation has been made concerning active
or standby, active is assumed.)
S (Initial) New
SM261
OFF : Reads
ON : Does not read
• For refresh from link to CPU module (B, W, etc.)
indicate whether to read from the link module.
UNew
SM262
OFF : Writes
ON : Does not write
• For refresh from CPU module to link (B, W, etc.),
designate whether to write to the link module.
UNew
SM265
MELSECNET/10,
MELSECNET/H
module 3 information
OFF : Operative network
ON : Standby network
• Goes ON for standby network
(If no designation has been made concerning active
or standby, active is assumed.)
S (Initial) New
SM266
OFF : Reads
ON : Does not read
• For refresh from link to CPU module (B, W, etc.)
indicate whether to read from the link module.
UNew
SM267
OFF : Writes
ON : Does not write
• For refresh from CPU module to link (B, W, etc.),
designate whether to write to the link module.
UNew
SM270
MELSECNET/10,
MELSECNET/H
module 4 information
OFF : Operative network
ON : Standby network
• Goes ON for standby network
(If no designation has been made concerning active
or standby, active is assumed.)
S (Initial) New
SM271
OFF : Reads
ON : Does not read
• For refresh from link to CPU module (B, W, etc.)
indicate whether to read from the link module.
UNew
SM272
OFF : Writes
ON : Does not write
• For refresh from CPU module to link (B, W, etc.),
designate whether to write to the link module.
UNew
SM280 CC-Link error
OFF : Normal
ON : Error
• Goes ON when a CC-Link error is detected in any of
the installed CC-Link module. Goes OFF when
normal operation is restored.
S (Status change) New
SM315
Communication
reserved time delay
enable/disable flag
OFF : Without delay
ON : With delay
• This flag is enabled when the time reserved for
communication processing is set in SD315.
• Turns ON to delay the END processing by the time
set in SD315 in order to perform communication
processing.
(The scan time increases by the period set in
SD315.)
• Turns OFF to perform the END processing without a
delay of the time set in SD315 when there is no
communication processing. (Defaults to OFF)
U New Q00J/Q00/Q01
SM320
Presence/absence of
SFC program
OFF : SFC program absent
ON : SFC program present
• Turns ON when an SFC program is registered.
• OFF when an SFC program is not registered.
S (Initial) M9100
Q00J/Q00/Q01
*1
Qn(H)
QnPH
QnPRH
QnU
SM321
Start/stop SFC
program
OFF : SFC program not
executed (stop)
ON : SFC program executed
(start)
• Initial value is set at the same value as SM320.
(Goes ON automatically if SFC program is present.)
• Turn this relay from ON to OFF to stop program
execution.
• Turn this relay from OFF to ON to resume program
execution.
S (Initial)/U
M9101form
at change