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Appendix 3 SPECIAL RELAY LIST
(11) Process control instructions
(12) For redundant systems (Host system CPU information *1)
SM1510 to SM1599 are only valid for redundant systems.
All off for standalone systems.
*1: The information of the host CPU module is stored.
TableApp.3.13 Special relay
Number Name Meaning Explanation
Set by
(When Set)
Corres-
ponding
ACPU
M9
Corresponding
CPU
SM1500 Hold mode
OFF : No-hold
ON : Hold
• Specifies whether or not to hold the output value
when a range over occurs for the S.IN instruction
range check.
UNew
QnPH
QnPRH
SM1501 Hold mode
OFF : No-hold
ON : Hold
• Specifies whether or not the output value is held
when a range over occurs for the S.OUT instruction
range check.
UNew
TableApp.3.14 Special relay
Number Name Meaning Explanation
Set by
(When Set)
Corres-
ponding
ACPU
M9
Corresponding
CPU
SM1510 Operation mode
OFF : Redundant system
backup mode, stand-
alone system
ON : Redundant system
separate mode
• Turns on when the operating mode is redundant
system separate.
S (Each END) New
QnPRH
SM1511
System A identification
flag
• Distinguishes between system A and system B.
• The flag status does not change even if the tracking cable is disconnected.
S (Initial) New
SM1512
System B identification
flag
SM1513
Debug mode status
flag
OFF : Not in debug mode
ON : Debug mode
• Turns on when the redundant system operating
mode is set to debug mode.
S (Initial) New
SM1515
Control system
judgment flag
• Indicates operation system status.
• The flag status does not change even if the tracking cable is disconnected.
S (Status change) New
SM1516
Standby system
judgment flag
SM1511
SM1512
ON
OFF
System A
OFF
System B
ON
OFF
OFF
When TRK. CABLE ERR.
(error code: 6210) occurs (Unknown)
SM1515
SM1516
ON
OFF
Control
system
OFF
Standby
system
ON
OFF
OFF
When TRK. CABLE ERR.
(error code: 6210) occurs (Unknown)