Omron SYSMAC C Series User Manual

Maintenance and troubleshooting
List of self-diagnostic functions
LED
on
CPU
rack
Message
on
POWER| RUN programming
console display
Power failure Turn on power.
CPU failure Set PROGRAM mode and perform power reset. Program may
require correction.
i Check RAM/ROM for correct mounting; debug program. After
MEMORY
ERR
Memory
failure
corrective
action,
perform
failure
reset
operation.
END instruction No END instruction at end of program. Write in END instruction
NO END INSTR missing error and then perform failure reset operation.
check bus line eonnecuing the un W/O units. Check cable A
P isconnection or breakage. When I/O link unit is used, chec!
VO BUS ERR VO bus failure channel setting and optical-fiber cable for breakage. After
corrective action, perform failure reset operation.
Check battery for proper insertion into the socket. Replace if
BATT LOW Battery failure fully discharged. After corrective action, perform failure reset
operation.
Xx: denotes that the indicator illuminates.
: denotes that the indicator goes off.
©: denotes that the indicator blinks.
a. “Fatal error” i.e., one that causes the CPU to stop operating
b. “Nonfatal error” one that does not cause the CPU to stop operating
CPU failure a
The
“watchdog
timer”
is
a
timer
that
is
reset
each
time
the
CPU
executes
the
END
instruction.
This
timer
is
used
to
check
the
execution
time
of
the
CPU
when
it
operates
in
the
RUN
or
MONITOR
mode.
When
the
set
time
of the watchdog timer is up, this indicates a failure.
Memory failure
Sum
check
of
the
memory
is
performed
at
fixed
intervals
to
check
the
memory
contents
and
existence
of
any
abnormal
instruction.
END instruction missing error
Checks
whether
the
END
instruction
is
written
at
the
end
of
the
program.
V0 bus failure
The
1/O
cable
is
checked
for
breakage.
The
hardware
of
the
I/O
control
section of the PC is also checked.
Battery failure
Checks
the
supply
voltage
of
the
memory
backup
battery.
By
forming
a
program
as
shown
below
using
special
auxiliary
relay
1808,
an
alarm
signal
can
be
output
to
an
external
device
when
there
is
a
drop
in
the
battery
supply
voltage.
ie

Omron SYSMAC C Series Specifications

General

Brand	Omron
Model	SYSMAC C Series
Category	Controller
Language	English