650
APPX
Appendix 4  List of Special Relay Areas
*1 There are restrictions on the firmware version of the CPU module and software version of the engineering tool. ( Page 747 Added 
and Enhanced Functions)
SM315 Service processing 
constant wait setting flag
*1
Off: Do not wait for service 
processing.
On: Wait for service 
processing.
• This relay is turned on when the CPU module is required to 
accept the service processing requests until the time or rate 
specified in "Device/Label Access Service Processing 
Setting" in "CPU parameter" elapses. (The scan time will 
increase according to the specified time or rate. When 
"Specifying Method" is set to "Set Processing Counts" or 
"Execute END Processing between Programs", the CPU 
module does not wait for the device/label access service 
processing regardless of the on/off state of this relay.)
• This relay is turned off when the CPU module is not 
required to wait for the device/label access service 
processing in END processing when there are no requests. 
(Default: Off)
• The device/label access service processing constant wait 
function is not enabled unless "AFFFH" is stored in SD315 
(Service processing constant wait status setting) while 
SM315 is on, and the CPU module does not wait for the 
device/label access service processing.
U (Request)
SM384 System operation setting 
request
*1
Off: Request accepted
On: Request submitted
• This relay is turned from off to on to send a setting request 
and write/delete data to/in the setting storage area (system 
memory) with the value set in SD384.
• Regardless of whether it was successful or not, this relay 
turns off when the setting request is accepted.
U/S (Status 
change)
SM385 System operation setting 
error
*1
Off: No error
On: Error
• This relay turns on when writing into the setting storage 
area (system area) fails.
S (Status change)
SM386 Program restoration 
information write status 
LED control setting 
mode
*1
Off: LED flashing
On: Without LED flashing
• This relay indicates the LED control setting status of 
program restoration information.
S (Initial)
SM387 Program restoration 
information write status
*1
Off: All written
On: Not all written
• This relay indicates the write status of program restoration 
information in the CPU module.
• This relay turns off when all program restoration 
information is written.
• This relay turns on if there is any program whose program 
restoration information is not in the CPU module.
S (Status change)
SM388 File batch online change 
operation setting status
*1
Off: Program file only
On: Program file/FB file/
global label setting file
This relay indicates the operating status of the file batch 
online change.
S (Status change)
No. Name Data stored Details Set by (setting 
timing)