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12
TROUBLESHOOTING
Number
Name
OFF : Operative network
SM255
ON : Standby network
MELSECNET/10,
MELSECNET/H
OFF : Reads
SM256
module 1 information
ON : Does not read
OFF : Writes
SM257
ON : Does not write
OFF : Operative network
SM260
ON : Standby network
MELSECNET/10,
MELSECNET/H
OFF : Reads
SM261
module 2 information
ON : Does not read
OFF : Writes
SM262
ON : Does not write
OFF : Operative network
SM265
ON : Standby network
MELSECNET/10,
MELSECNET/H
OFF : Reads
SM266
module 3 information
ON : Does not read
OFF : Writes
SM267
ON : Does not write
OFF : Operative network
SM270
ON : Standby network
MELSECNET/10,
MELSECNET/H
OFF : Reads
SM271
module 4 information
ON : Does not read
OFF : Writes
SM272
ON : Does not write
OFF : Normal
SM280
CC-Link error
ON : Error
Communication
OFF : Without delay
SM315
reserved time delay
ON : With delay
enable/disable flag
Presence/absence of
OFF : SFC program absent
SM320
SFC program
ON : SFC program present
OFF : SFC program not
Start/stop SFC
SM321
program
ON : SFC program executed
*1: This applies to the CPU of function version B or later.
Table12.29 Special relay
Meaning
• Goes ON for standby network(If no designation has
been made concerning active or standby, active is
assumed.)
• For refresh from link to CPU module (B, W, etc.)
indicate whether to read from the link module.
• For refresh from CPU module to link (B, W, etc.),
designate whether to write to the link module.
• Goes ON for standby network
(If no designation has been made concerning active
or standby, active is assumed.)
• For refresh from link to CPU module (B, W, etc.)
indicate whether to read from the link module.
• For refresh from CPU module to link (B, W, etc.),
designate whether to write to the link module.
• Goes ON for standby network
(If no designation has been made concerning active
or standby, active is assumed.)
• For refresh from link to CPU module (B, W, etc.)
indicate whether to read from the link module.
• For refresh from CPU module to link (B, W, etc.),
designate whether to write to the link module.
• Goes ON for standby network
(If no designation has been made concerning active
or standby, active is assumed.)
• For refresh from link to CPU module (B, W, etc.)
indicate whether to read from the link module.
• For refresh from CPU module to link (B, W, etc.),
designate whether to write to the link module.
• Goes ON when a CC-Link error is detected in any of
the installed CC-Link module. Goes OFF when
normal operation is restored.
• Goes ON when a CC-Link error is detected in any of
the installed CC-Link module. Remains ON if the
condition is restored to normal thereafter.
• 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)
• Turns ON when an SFC program is registered.
• OFF when an SFC program is not registered.
• Initial value is set at the same value as SM320.
(Goes ON automatically if SFC program is present.)
executed (stop)
• Turn this relay from ON to OFF to stop program
execution.
(start)
• Turn this relay from OFF to ON to resume program
execution.
Explanation
(When Set)
S (Initial)
S (Initial)
S (Initial)
S (Initial)
S (Status change)
S (Initial)
S (Initial)/U
12.7 Special Relay List
Corres-
ponding
Set by
Corresponding
ACPU
CPU
M9
New
U
New
U
New
New
U
New
QnA
U
New
Qn(H)
QnPH
QnPRH
New
U
New
U
New
New
U
New
U
New
Qn(H)
QnPH
New
QnPRH
Rem
S (Error)
New
QnA
U
New
Q00J/Q00/Q01
M9100
QnA
Q00J/Q00/Q01
Qn(H)
M9101form
QnPH
at change
QnPRH
QnU
12
9
10
11
12
*1
- 275
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Table of Contents
Troubleshooting
