Omron ZEN Operation Manual page 126

Error Messages
Error at Power ON or During Operation
Error message
I/O BUS ERR
MEMORY ERR
I2C ERR
Error During Program Transfer from Memory Cassette
Error message
M/C ERR
Note
Display function (D):
• For AC power supply types, analog-converted values (I4/I5 or Ia/
Ib) are specified as the displayed items.
• For types without calendar/clock function, the date (DAT), day/
month (DAT1), and time (CLK) are specified as the displayed
items.
Probable cause
Expansion I/O Unit con-
nection error.
Program error.
Communications error
between Memory and
RTC.
Probable cause
Memory cassette pro-
gram error.
Use the ZEN Support Software to read error messages for LED-
type CPU Units.
Possible solution
Turn OFF the power supply and check that
the Expansion I/O Unit is connected prop-
erly.
Execute the All Clear operation and then re-
write the program.
Press any operation button and clear the
error. Replace the CPU Unit if the error
occurs frequently.
Possible solution
Save the error-free program to the Memory
Cassette again.
Section 6-2
103