Special Internal Relays - IDEC FC4A-C10R2 User Manual

Special Internal Relays

Special internal relays M8000 through M8077 are read/write internal relays used for controlling the CPU operation and
communication. Special internal relays M8080 through M8157 are read-only internal relays primarily used for indicating
the CPU statuses. All special internal relays cannot be used as destinations of advanced instructions.
Internal relays M300 through M315 are used to read input operand statuses of the IOREF (I/O refresh) instruction.
• Do not change the status of reserved special internal relays, otherwise the
Caution
operate correctly.
Special Internal Relay Allocation Numbers (Read/Write)
Allocation
Number
M8000 Start Control
M8001 1-sec Clock Reset
M8002 All Outputs OFF
M8003 Carry (Cy) or Borrow (Bw)
M8004 User Program Execution Error
M8005 Data Link Communication Error
M8006 Data Link Communication Prohibit Flag (Master Station)
Data Link Communication Initialize Flag (Master Station)
M8007
Data Link Communication Stop Flag (Slave Station)
M8010 Status LED
M8011 HMI Write Prohibit Flag
M8012 HMI Operation Prohibit Flag
M8013 Calendar/Clock Data Write/Adjust Error Flag
M8014 Calendar/Clock Data Read Error Flag
M8015 Calendar/Clock Data Read Prohibit Flag
M8016 Calendar Data Write Flag
M8017 Clock Data Write Flag
M8020 Calendar/Clock Data Write Flag
M8021 Clock Data Adjust Flag
M8022 User Communication Receive Instruction Cancel Flag (Por t 1)
M8023 User Communication Receive Instruction Cancel Flag (Por t 2)
M8024 BMOV/WSFT Executing Flag
M8025 Maintain Outputs While CPU Stopped
M8026 Expansion Data Register Data Writing Flag (Preset Range 1)
M8027 Expansion Data Register Data Writing Flag (Preset Range 2)
M8030 High-speed Counter 1 (I0-I2) Comparison Output Reset
M8031 High-speed Counter 1 (I0-I2) Gate Input
M8032 High-speed Counter 1 (I0-I2) Reset Input
M8033
M8034 High-speed Counter 2 (I3) Comparison Output Reset
M8035 High-speed Counter 2 (I3) Gate Input
M8036 High-speed Counter 2 (I3) Reset Input
M8037
M8040 High-speed Counter 3 (I4) Comparison Output Reset
M8041 High-speed Counter 3 (I4) Gate Input
M8042 High-speed Counter 3 (I4) Reset Input
M8043
M8044 High-speed Counter 4 (I5-I7) Comparison Output Reset
Description
— Reserved —
— Reserved —
— Reserved —
« FC4A M S U '
ICRO MART SER S
6: A
CPU Stopped
M »
ANUAL
N
LLOCATION UMBERS
may not
MicroSmart
Power OFF
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