IDEC MicroSmart - Manual (Page 174)

6: A LLOCATION N UMBERS
6-10 « FC4A M ICRO S MART U SER ’ S M ANUAL »
M8000 Start Control
M8000 is used to control the operation of the CPU. The CPU stops operation when M8000 is turned off while the CPU is
running. M8000 can be turned on or off using the WindLDR Online menu. When a stop or reset input is designated, M8000
must remain on to control the CPU operation using the stop or reset input. For the start and stop operation, see page 4-3.
M8000 maintains its status when the CPU is powered down. When the data to be maintained during power failure is bro-
ken after the CPU has been off for a period longer than the battery backup duration, the CPU restarts operation or not as
selected in Function Area Settings > Run/Stop > Run/Stop Selection at Memory Backup Error. See page 5-3.
M8001 1-sec Clock Reset
While M8001 is on, M8121 (1-sec clock) is turned off.
M8002 All Outputs OFF
When M8002 is turned on, all outputs (Q0 through Q307) go off until M8002 is turned off. Self-maintained circuits using
outputs also go off and are not restored when M8002 is turned off.
M8003 Carry (Cy) and Borrow (Bw)
When a carry or borrow results from executing an addition or subtraction instruction, M8003 turns on. M8003 is also used
for the bit shift and rotate instructions. See pages 11-2 and 13-1.
M8004 User Program Execution Error
When an error occurs while executing a user program, M8004 turns on. The cause of the user program execution error can
be checked using Online > Monitor > PLC Status > Error Status > Details. See page 29-6.
M8005 Data Link Communication Error
When an error occurs during communication in the data link system, M8005 turns on. The M8005 status is maintained
when the error is cleared and remains on until M8005 is reset using
WindLDR or until the CPU is turned off. The cause of
the data link communication error can be checked using Online > Monitor > PLC Status > Error Status > Details. See
page 25-4.
M8006 Data Link Communication Prohibit Flag (Master Station)
When M8006 at the master station is turned on in the data link system, data link communication is stopped. The M8006
status is maintained when the CPU is turned off and remains on until M8006 is reset using
WindLDR .
M8007 Data Link Communication Initialize Flag (Master Station)
Data Link Communication Stop Flag (Slave Station)
M8007 has a different function at the master or slave station of the data link communication system.
Master station: Data link communication initialize flag
When M8007 at the master station is turned on during operation, the link configuration is checked to initialize the data link
system. When a slave station is powered up after the master station, turn M8007 on to initialize the data link system. After
a data link setup is changed, M8007 must also be turned on to ensure correct communication.
Slave station: Data link communication stop flag
When a slave station does not receive communication data from the master station for 10 sec or more in the data link sys-
tem, M8007 turns on. When the slave station receives correct communication data, M8007 turns off.
M8010 Status LED
When M8010 is turned on or off, the STAT LED on the CPU module turns on or off, respectively.
M8011 HMI Write Prohibit Flag
When M8011 is turned on, the HMI module is disabled from writing data to prevent unauthorized modifications, such as
direct set/reset, changing timer/counter preset values, and entering data into data registers.
M8012 HMI Operation Prohibit Flag
When M8012 is turned on, the HMI module is disabled from all operations, reducing the scan time. To turn off M8012,
power down and up the CPU, or use the Point Write on
WindLDR.