Chapter 8 Special Relay
Special relay
8-1
Chapter 8 special relay
PC status (M)
Device No.
Function
Operation
8000
RUN monitor
(NO contact)
8001
RUN monitor
(NC contact)
8002
Initial pulse
(NO contact)
8003
Initial pulse
(NC contact)
RUN input
M8061
M8000
M8001
M8002
M8003
8004 Error
occurrence
ON when one or more flags of M8061,M8064~
M8067 are ON
8005 Warning
occurrence
ON when one or more flags of M8060,M8063,
M8069 are ON
8006
Battery low voltage
ON when battery voltage is too low.
OFF when a new battery is installed.
8007
Latch for battery low voltage
ON when battery voltage is too low.
Clock device
（
M
）
Operation flags
（
M
）
Device No.
Function
Operation
8011
10ms period oscillator
5ms ON/5ms OFF
8012
100ms period oscillator
50ms ON/50ms OFF
8013
1s period oscillator
0.5s ON/0.5s OFF
8014
1min period oscillator
30s ON/30s OFF
8015
Clock stop and set
Stop timing and reset the clock
8016
Stop displaying clock time
Stop displaying clock time
8017
+/-30s offset
+/-30 s offset for internal time
8018
RTC detection
Check whether RTC is enabled.
8019
RTC error
Clock is set out of the range.
Device No.
Function
Operation
8020
Zero
On when the result of add or subtract is 0
8021
Borrow
On when the result of subtract is smaller than the
minimum negative number of the system
8022
Carry
ON when the result of add should be carry
8023
8024
BMOV direction
(F15) 0: forward,1:reverse
8026
RAMP mode
(F67)0: reset, 1: keep
8027 PR
mode
（
F77
）
0: 8bytes;1: 16bytes
8029
Instruction execution ends
ON when the instruction as DSW(F72) is finished
