Troubleshooting; Error Messages - Omron ZEN Operation Manual

Troubleshooting

6-1 Troubleshooting
ERR
6-2

Error Messages

Power ON but No Operation
Error message
MEMORY ERR
I/O BUS ERR
UNIT OVER
I/O VRFY ERR
Note
102
Search for the cause of the error and take immediate countermea-
sures if ERR or any other error message appears on the LCD screen
(for LCD-type CPU Units) or the ERROR indicator is lit (on LED-type
CPU Units).
LCD-type CPU Unit
(with LCD and operation buttons)
The following tables list the error messages that are displayed when
an error occurs.
Probable cause
Program error.
Expansion I/O Unit connec-
tion error.
More than 3 Expansion I/O
Units connected.
Bit type that cannot be
used with system configu-
ration included in ladder
program. (See note.)
I/O Verification Error
Expansion I/O Unit I/O bits (X/Y): Bit not allocated in system configu-
ration has been used.
Analog comparators (A): Used with AC power supply type.
Weekly timers (@)/Calendar timers (∗): Used with ZEN without calen-
dar/clock function.
ERROR
LED-type CPU Unit
(no LCD/operation buttons)
Possible solution
The ladder program and parameter settings
have been cleared. Write a program to the
ZEN again.
Turn OFF the power supply and check that
the Expansion I/O Units are connected prop-
erly.
Turn OFF the power supply and reduce the
number of Expansion I/O Units to 3 or less.
Remove the illegal bit type from the program.
Section 6-1