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6: A
LLOCATION
N
UMBERS
6-10
O
PEN
N
ET
C
ONTROLLER
U
SER
’
S
M
ANUAL
M8012 SFR(N) Shifting Flag
When power failure occurs while data shift is in progress in a shift register, M8012 is turned on. If M8012 is on when the
CPU is powered up again, the data in keep-designated shift registers may be broken and cannot be used to continue correct
data shifting. To prevent continuation of incorrect data shifting at startup, include M8012 in the user program to prevent
program execution. If a shift register is not designated as a keep type, the shift register data is cleared when power is
restored.
M8014 Write Communication Command Execution at Receive Completion
When M8014 is off while maintenance protocol communication is in progress, incoming write commands are executed at
the END processing of a user program and the data is written into the CPU. When M8014 is on, write commands are exe-
cuted immediately when the receive completion flag of a user communication RXD instruction is turned on, without wait-
ing for the END processing. M8014 is valid for all communication ports; RS232C port 1 and port 2, and RS485. When an
IDEC’s HG series operator interface is linked to the
OpenNet Controller
, use the
OpenNet Controller
with M8014 set on.
M8020 Calendar/Clock Data Write Flag
When M8020 is turned on, data in data registers D8015 through D8021 (calendar/clock preset data) are set to the internal
clock of the CPU. See page 15-7.
M8021 Clock Data Adjust Flag
When M8021 is turned on, the clock is adjusted with respect to seconds. If seconds are between 0 and 29 for current time,
adjustment for seconds will be set to 0 and minutes remain the same. If seconds are between 30 and 59 for current time,
adjustment for seconds will be set to 0 and minutes are incremented one. See page 15-8.
M8022 User Communication Receive Instruction Cancel Flag (RS232C Port 1)
When M8022 is turned on, all RXD1 instructions ready for receiving user communication through RS232C port 1 are dis-
abled.
M8023 User Communication Receive Instruction Cancel Flag (RS232C Port 2)
When M8023 is turned on, all RXD2 instructions ready for receiving user communication through RS232C port 2 are dis-
abled.
M8030 INTERBUS Master Initialize
When M8030 is turned on, the INTERBUS master is initialized. See page 24-11.
M8036 INTERBUS Master Bus NG
When the INTERBUS master detects a BUS NG, M8036 is turned on. See page 24-11.
M8037 INTERBUS Master Peripheral Fault
When the INTERBUS master detects a peripheral fault, M8037 is turned on. See page 24-11.
M8040 INTERBUS Master Error
When a critical error is found in the INTERBUS master hardware/software, M8040 or M8041 is turned on, depending on
error contents, and the master module is initialized. See page 24-11.
M8041 INTERBUS Master Error
When a critical error is found in the INTERBUS master hardware/software, M8040 or M8041 is turned on, depending on
error contents, and the master module is initialized. See page 24-11.
M8120 Initialize Pulse
When the CPU starts operation, M8120 turns on for a period of one scan.
M8121 1-sec Clock
While M8001 is off, M8121 generates clock pulses in 1-sec incre-
ments, with a duty ratio of 1:1 (500 msec on and 500 msec off).
1 scan time
Star t
M8120
M8121
500 msec
1 sec
500 msec
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