
8
8.2 Alarms Displayed on the PMC Screen
526
Alarm number Contents
Faulty location/
corrective action
NO WRITE COIL Add proper write coil. Write coil is necessary, but
is not found.
CALL/CALLU IN
BAD LEVEL
CALL/CALLU must be used
in Level 2 or in subpro-
grams. Do not use any other
places.
CALL/CALLU is used in
wrong place.
SP IN LEVEL3 If END3 is located wrong,
move it to correct position. If
the SP is unnecessary, re-
move it.
SP is found in level 3.
(3) Messages displayed during net editing of the PMC ladder diagram
editing
Alarm number
Faulty location/
corrective action
Contents
TOO MANY
FUNCTIONAL
INSTRUCTIONS IN
ONE NET
Only one functional instruc-
tion is allowed to constitute
a net. If necessary, divide
the net into plural nets.
Too many functional
instructions are in one net.
TOO LARGE NET Divide the net into plural
nets so that step number in
a net may become small.
Net is too large. When a net
is converted into the object,
the net exceeds 256 steps.
NO INPUT FOR
OPERATION
Coil without input, or coil
connected to output of func-
tional instruction that has no
output, causes this error. If
coil is not necessary, re-
move it. If necessary, con-
nect it to meaningful input.
No signal is provided for
logical operation.
OPERATION AFTER
FUNCTION IS
FORBIDDEN
Output of functional instruc-
tion can not be connected to
a contact, nor to conjunc-
tion with other signal that
will be implemented by log-
ical–or operation.
No logical operation with
functional instruction output
is permitted, except write
coils.
WRITE COIL IS
EXPECTED
Add proper write coil to the
net.
Write coil is expected, but
not found.
BAD COIL
LOCATION
Coil can be located only at
rightmost column. Any coil
located at other place must
be erased once, and place
necessary coils in correct
place.
Coil is located in bad posi-
tion.
SHORT CIRCUIT Find contact with terminals
connected by short circuit,
and correct connections.
Some contacts are con-
nected with short circuit.
FUNCTION AFTER
DIVERGENCE IS
FORBIDDEN
Functional instruction can
not be used in output sec-
tion of net. If necessary, di-
vide the net into plural nets.
Functional instruction is
used in output section of
net.
ALL COIL MUST
HAVE SAME INPUT
Left terminals of all coils in
a net must be connected to
same input point.
When a net contains more
than one coil, the coils
should not have any contact
beside them affects only of
the coils.