818
APPX
Appendix 4 List of Special Relay Areas
*1 The programmable controller CPU with firmware version "28" or later supports these special relay areas. However, there are no
restrictions on the version of the R00CPU, R01CPU, and R02CPU.
*2 There are restrictions on the firmware version of the supported CPU module and software version of the engineering tool. ( Page
1008 Added and Enhanced Functions)
SM796 Number of used blocks
information for the multiple
CPU dedicated instruction
(for CPU No.1)
Off: The specified number
of blocks is reserved
On: The number of blocks
specified in SD796 is
not reserved
• This relay switches to on when the
number of remaining blocks in the
dedicated instruction transfer area to be
used in the multiple CPU dedicated
instruction (target machine: CPU No.1)
drops below the number of blocks
specified in SD796. This relay is also on
when the instruction is being executed.
• This relay switches to off when there exist
free blocks during the END processing.
S (Instruction execution/
During END)
Rn
*2
RnP
RnSF
SM797 Number of used blocks
information for the multiple
CPU dedicated instruction
(for CPU No.2)
Off: The specified number
of blocks is reserved
On: The number of blocks
specified in SD797 is
not reserved
• This relay switches to on when the
number of remaining blocks in the
dedicated instruction transfer area to be
used in the multiple CPU dedicated
instruction (target machine: CPU No.2)
drops below the number of blocks
specified in SD797. This relay is also on
when the instruction is being executed.
• This relay switches to off when there exist
free blocks during the END processing.
S (Instruction execution/
During END)
Rn
*2
RnP
RnSF
SM798 Number of used blocks
information for the multiple
CPU dedicated instruction
(for CPU No.3)
Off: The specified number
of blocks is reserved
On: The number of blocks
specified in SD798 is
not reserved
• This relay switches to on when the
number of remaining blocks in the
dedicated instruction transfer area to be
used in the multiple CPU dedicated
instruction (target machine: CPU No.3)
drops below the number of blocks
specified in SD798. This relay is also on
when the instruction is being executed.
• This relay switches to off when there exist
free blocks during the END processing.
S (Instruction execution/
During END)
Rn
*2
RnP
RnSF
SM799 Number of used blocks
information for the multiple
CPU dedicated instruction
(for CPU No.4)
Off: The specified number
of blocks is reserved
On: The number of blocks
specified in SD799 is
not reserved
• This relay switches to on when the
number of remaining blocks in the
dedicated instruction transfer area to be
used in the multiple CPU dedicated
instruction (target machine: CPU No.4)
drops below the number of blocks
specified in SD799. This relay is also on
when the instruction is being executed.
• This relay switches to off when there exist
free blocks during the END processing.
S (Instruction execution/
During END)
Rn
*2
RnP
RnSF
SM816 Hold mode (S.IN
instruction)
Off: Value not held
On: Value held
Whether to hold the output value or not is
specified when the input value is found to be
exceeding the valid range during the range
check processing of the S.IN instruction.
URnP
RnPSF
SM817 Hold mode (S.OUT
instruction)
Off: Value not held
On: Value held
This relay is used to specify whether or not
to hold the output values of the S.OUT1,
S.OUT2, and S.DUTY instructions if a
sensor error occurs.
URnP
RnPSF
No. Name Data stored Details Set by (setting timing) CPU
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