APPX
Appendix 4 List of Special Relay Areas
817
A
SM752 Dedicated instruction End
bit control flag
Off: Automatically
controlled
On: Not automatically
controlled
This relay can be used to set whether the
system automatically controls the on/off
operation of End bit being used for the
dedicated instruction and other (control of
End bit which is registered in the End
processing of the instruction completion and
turned on for only the next one scan (Off:
turned on for only one scan after the
instruction is completed as well as normal/
error End bit, On: turned on when the
instruction is completed and the On status is
maintained after that)).
UALL
SM753 File being accessed Off: Not in progress
On: In progress
• This relay is on during a file access by
using the SP.FWRITE/SP.FREAD/
SP.DEVST instructions.
• This relay is on while the SP.FTPPUT or
SP.FTPGET instruction is being executed.
• This relay is on while a database access
instruction is being executed.
*1
S (Status change) ALL
SM754 BIN/DBIN instruction error
control flag
Off: Executes error
detection
On: No execute error
detection
This relay can be switched to on when the
error detection is not desirable in the BIN/
DBIN instruction.
UALL
SM755 Scaling data check settings Off: Performs data check
On: Not perform data
check
This relay can be used to enable/disable the
check whether the scaling data is sorted in
ascending order when the SCL/DSCL/
SCL2/DSCL2 instruction is being executed.
UALL
SM756 Module access completion
wait control flag
Off: Not wait the
completion
On: Waits the completion
This relay can be used to determine
whether the system must wait until the
access is completed before starting the next
instruction when the write access instruction
to the buffer memory of another module is
being executed.
UALL
SM772 CCD/CRC instruction
conversion mode (16-bit/8-
bit) selection
Off: 16-bit conversion
mode
On: 8-bit conversion mode
This relay can be used to select 16-bit
conversion mode or 8-bit conversion mode
with the CCD/CRC instruction.
URn
*2
SM773 SMOV instruction BCD
conversion prohibit flag
Off: BCD conversion
enabled
On: BCD conversion
disabled
This relay switches to on when disabling
conversion from BIN data to BCD data with
the SMOV instruction.
URn
*2
SM775 Selection of refresh
processing during the COM
instruction execution
Off: Executes all the
refresh processings
On: Executes the refresh
processing specified in
SD775
This relay can be used to select the refresh
processing target when the COM instruction
is executed from two options: all refresh
processing or only refresh processing
specified in SD775.
UALL
SM776 Local device setting at
CALL
Off: Disables local devices
On: Enables local devices
This relay can be used to determine
whether the local devices on the subroutine
program called when the CALL instruction is
being executed are enabled or not.
UALL
SM777 Local device setting in
interrupt programs
Off: Disables local devices
On: Enables local devices
This relay can be used to determine
whether the local devices are enabled or not
when the interrupt program is being
executed.
However, for the SIL2 Process CPU and
Safety CPU, local devices/safety local
devices of a program file in the storage
location are always used in the standard
program/safety program, regardless of the
setting of SM777.
UALL
SM792 PID bumpless processing
(for the complete
differentiation PIDCONT
instruction)
Off: Matching
On: Not matching
This relay can be used to specify whether to
match SV to PV in manual mode.
UALL
SM794 PID bumpless processing
(for the inexact differential
S.PIDCONT instruction)
Off: Matching
On: Not matching
This relay can be used to specify whether to
match SV to PV in manual mode.
UALL
No. Name Data stored Details Set by (setting timing) CPU
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