Omron CX-PROCESS MONITOR PLUS V2 - 01-2007 Operation Manual page 152

System Monitor Screens
Code Description
71 Inappropriate parame-
ter
80 Step Ladder Program
command error
81 Step Ladder Program
source designation not
defined
89 Overuse of Step Lad-
der Program differenti-
ated instruction
Explanation
a) When restricted condi-
tions are applied across
two ITEMs:
(example: when the unit
pulse output is equal to or
greater than the opera-
tion cycle when there is
unit pulse output in run
time accumulation)
b) An attempt has been
made to write out-of-
range data at the ITEM
Setting block.
There is an irrelevant com-
mand in the Step Ladder Pro-
gram, or the method of use of
commands is wrong, for
example, there is an AND
command even though there
is no input command.
Either the function block is not
registered to the block
address currently specified by
each command in the Step
Ladder Program, or the ITEM
number does not exist.
The number of differentiated
instructions to be simulta-
neously executed has
exceeded 256.
Operation at Error
a) The function block in
question is not exe-
cuted.
b) Data cannot be written.
The command in question
and onwards are not exe-
cuted.
The command in question
and onwards are not exe-
cuted.
Differentiated instructions
exceeding 256 instructions
are not executed.
Section 4-17
Remedy
Check the settings of the
ITEMs.
Check the program within
the Step Ladder Program
block.
Check the block address
and ITEM number.
Reduce the number of dif-
ferentiated instructions to
be executed simulta-
neously.
137