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6: A
LLOCATION
N
UMBERS
6-6
O
PEN
N
ET
C
ONTROLLER
U
SER
’
S
M
ANUAL
Special Internal Relay Allocation Numbers
Special internal relays M8000 through M8117 are read/write internal relays used for controlling the CPU operation and
communication. Special internal relays M8120 through M8237 are read-only internal relays primarily used for indicating
the CPU statuses. All special internal relays cannot be used as destinations of advanced instructions.
Special Internal Relays (Read/Write)
Allocation
Number
Description
CPU Stopped
Power OFF
M8000
Star t Control
Maintained
Maintained
M8001
1-sec Clock Reset
Cleared
Cleared
M8002
All Outputs OFF
Cleared
Cleared
M8003
Carr y (Cy) or Borrow (Bw)
Cleared
Cleared
M8004
User Program Execution Error
Cleared
Cleared
M8005
Data Link Communication Error
Maintained
Cleared
M8006
Data Link Communication Prohibit Flag (Master Station)
Maintained
Maintained
M8007
Data Link Communication Initialize Flag (Master Station)
Data Link Communication Stop Flag (Slave Station)
Cleared
Cleared
M8010
High-speed Counter Comparison Output Reset
Cleared
Cleared
M8011
Maintain Outputs While CPU Stopped
Maintained
Cleared
M8012
SFR(N) Shifting Flag
Maintained
Maintained
M8013
— Reser ved —
—
—
M8014
Write Communication Command Execution at Receive Completion
Maintained
Maintained
M8015-M8017
— Reser ved —
—
—
M8020
Calendar/Clock Data Write Flag
Maintained
Cleared
M8021
Clock Data Adjust Flag
Maintained
Cleared
M8022
User Communication Receive Instruction Cancel Flag (RS232C Por t 1)
Cleared
Cleared
M8023
User Communication Receive Instruction Cancel Flag (RS232C Por t 2)
Cleared
Cleared
M8024-M8027
— Reser ved —
—
—
M8030
INTERBUS Master Initialize
Maintained
Cleared
M8031-M8035
— Reser ved —
—
—
M8036
INTERBUS Master Bus NG (read only)
Maintained
Cleared
M8037
INTERBUS Master Peripheral Fault (read only)
Maintained
Cleared
M8040
INTERBUS Master Error (read only)
Cleared
Cleared
M8041
INTERBUS Master Error (read only)
Cleared
Cleared
M8042-M8047
— Reser ved —
—
—
M8050
RS232C Por t 1 Modem Mode (Originate): Initialization String Star t
Maintained
Maintained
M8051
RS232C Por t 1 Modem Mode (Originate): ATZ Star t
Maintained
Maintained
M8052
RS232C Por t 1 Modem Mode (Originate): Dialing Star t
Maintained
Maintained
M8053
RS232C Por t 1 Modem Mode (Disconnect): Disconnect Line Star t
Maintained
Maintained
M8054
RS232C Por t 1 Modem Mode (General Command): AT Command Star t
Maintained
Maintained
M8055
RS232C Por t 1 Modem Mode (Answer): Initialization String Star t
Maintained
Maintained
M8056
RS232C Por t 1 Modem Mode (Answer): ATZ Star t
Maintained
Maintained
M8057
RS232C Por t 1 Modem Mode AT Command Execution
Maintained
Cleared
M8060
RS232C Por t 1 Modem Mode (Originate): Initialization String Completion
Maintained
Cleared
M8061
RS232C Por t 1 Modem Mode (Originate): ATZ Completion
Maintained
Cleared
M8062
RS232C Por t 1 Modem Mode (Originate): Dialing Completion
Maintained
Cleared
M8063
RS232C Por t 1 Modem Mode (Disconnect): Disconnect Line Completion
Maintained
Cleared
M8064
RS232C Por t 1 Modem Mode (General Command): AT Command Completion
Maintained
Cleared
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