
8. TROUBLESHOOTING
B–64115EN/01
492
1) If bit 0 of the binary representation of xx is “1”, this indicates that the
master station (CNC) received invalid communication data. For
example, assume that the following is displayed on the screen:
SYSTEM ALARM
950 PMC SYSTEM ALARM
PC050 IOLINK CH1 aabb–4142:aabb
xx is equal to 41, or “01000001” in binary notation. Bit 0, which is
the lowest (rightmost) bit, is “1”.
In this case, check the following:
(1)Noise environment of the I/O Link cable
Noise may disturb the data on the I/O Link and may result in a
problem.
(2)Contact of the I/O Link cable
Check that the I/O link cable is in contact. Check that the cable is
not loose and is latched firmly.
(3)Cable failure
Check that the I/O Link cable is connected properly.
(4)Device failure
The main board or any of the I/O devices connected to the I/O Link
may be defective. Replace the devices, one at a time, to identify
the defective device.
Refer to 2) if bit 1 (second bit from the right) is also “1”.
2) If bit 1 of the binary representation of xx is “1”, this indicates that an
error was detected on a slave station (I/O device). For example,
assume that the following is displayed on the screen:
SYSTEM ALARM
950 PMC SYSTEM ALARM
PC050 IOLINK CH1 aabb–4382:aabb
xx is equal to 43, or “01000011” in binary notation. Bit 1 (second bit
from the right) is “1”.
In this case, yy indicates the following:
Number equal to the number indicated by bits 0 to 4 of yy minus 1:
Group number of the slave station on which an error was detected
Bit 5 of yy:
Invalid communication data was detected on the slave.
Bit 6 of yy:
Another error was detected on the slave.
Bit 7 of yy:
A watchdog or parity error was detected on the slave.
In the example shown in the figure above, yy is equal to 82, or
“10000010” in binary notation. Bits 0 to 4 are “00010” (2 in decimal
notation). The number “1”, which is equal to that number minus 1, is
the group number of the slave station on which an error was detected.
Bit 7 is “1”. Thus, a watchdog or parity error was detected on the slave
station in group 1.