
B–64115EN/01
8. TROUBLESHOOTING
493
In this case, check the following:
(1)If bit 5 of yy is “1”
Perform examination with the same procedure as that in 1).
(2)If bit 6 of yy is “1” or if bit 7 of yy is “1”
First, replace the device of the slave station of the indicated group
number.
If the problem is not solved, perform examination with the same
procedure as that in 1) to identify the defective location.
3) If bit 2 of the binary representation of xx is “1”, this indicates that the
link between the master station (CNC) and the slave station was
canceled. For example, assume that the following is displayed on the
screen:
SYSTEM ALARM
950 PMC SYSTEM ALARM
PC050 IOLINK CH1 aabb–8400:aabb
xx is equal to 84, or “1000100” in binary notation. Bit 2, which is the
third bit from the right, is “1”.
In this case, check the following:
(1)Disconnection of the slave station from the power supply
Check that the slave station is not turned off, that there are no
instantaneous power failures, and that the capacity of the power
supply is enough.
(2)Disconnection of the I/O link cable
Check that the I/O link cable has not fallen off or has not been
disconnected.
(3)If the problem is not solved, perform a check with the same
procedure as that in 1).
4) If bit 3 or 4 of the binary representation of xx is “1”, this indicates that
a parity error occurred in the PMC control circuit on the main board.
In this case, replace the motherboard (main board).
The main board may be defective. Replace the main board.
D Other cases