IDEC MicroSmart AS-i - Manual (Page 26)

4: O PERATION B ASICS
M ICRO S MART AS-I NTERFACE M ASTER M ODULE U SER ’ S M ANUAL 4-7
Troubles at System Start-up
The following table summarizes possible troubles at system start-up, probable causes and actions to be taken.
Trouble Cause and Action
PWR LED is off.
(power)
• AS-Inter face power is not supplied to the AS-Inter face master module. Check that
wiring is correct and AS-Inter face power is supplied.
• Power is not supplied from the CPU module to the AS-Inter face master module.
Check the connection between the CPU module and the AS-Inter face master module.
FLT LED is on.
(fault)
• Slave configuration on the bus is incorrect. Use the WindLDR slave monitor function
to check that slaves are connected correctly. Per form configuration, if necessar y. For
the configuration method, see page 7-1.
If FLT LED remains on even though slaves are connected correctly and configuration is
completed, either disconnect and reconnect the AS-Inter face connector, or turn off and
on the AS-Inter face power supply.
LMO LED is on.
(local mode)
The CPU module fails to communicate with the AS-Inter face master module. Check the
following points.
• Is the CPU module compatible with AS-Inter face? Check the Type No. of the CPU
module.
• Is the system program of the CPU module 201 or higher? Check the system program
version in the Online > PLC Status dialog box in WindLDR.
• Is a check mark put in the check box “Use AS-Inter face Master Module” in WindLDR
Function Area Settings? The box is checked as default. If not, put a check mark and
download the user program to the CPU module.
OFF LED is on.
(offline) • While a slave of address 0 was connected, power was turned on. After changing the
slave address, power up again. For the address changing method, see page 7-2.
Slave operation is unstable.
• Check if there are two or more slaves with the same address. Each slave must have
a unique address. If two slaves have the same address and same identification
codes (ID, I/O, ID2, ID1), the AS-Inter face master module may fail to detect an error.
When changing the duplicate slave address using WindLDR, remove one of the
slaves from the bus.