231
Errors and Alarm Troubleshooting Section 7-1
19 Inappropriate
operation
Two or more S1 to S3 select
switches are set to 1 (ON) at
the same time in the 3-output
Selector block (Block Model
163) or 3-input Selector block
(Block Model 164).
The output value that was
active before the error
occurred is held.
Re-program the Step Ladder
Program block so that S1 to
S3 select switches are set to
1 (ON) independent of each
other.
There is a syntax error in
Arithmetic Operation (Block
Model 126), the THEN or
ELSE expression is not
defined, or the output reverse
scaling limits are not set.
Execution of the Arithmetic
Operation block will be
stopped.
Check the contents of the
conditional statement and
calculation expressions an
check the settings of the out-
put reverse scaling limits.
There are syntax errors in the
membership functions or
rules for the Fuzzy Logic
block (Block Model 016) mak-
ing execution impossible.
a) A value does not have one
sign character and 5 or fewer
numeric characters (e.g.,
when a + sign is included).
b) Values are not separated
by colons.
c) The values that have been
set are insufficient.
d) There are more than three
critical points in a member-
ship functions.
e) Critical points in member-
ship functions do not rise to
the right.
f) Membership functions are
not set for labels specified in
rules (NL, NS, ZR, PS, PL).
Operation of the Fuzzy Logic
block will stop.
Check the membership func-
tions and rules.
The ITEM number where the
problem occurred is given in
ITEM 006 (Operation Error
Details).
The “synchronous operation
reference parameter desig-
nation” set for Segment Pro-
gram 2 in the slave was
changed to 0 (master desig-
nation) during synchronous
operation using Segment
Program 2 (Block Model
157).
The slave's output value is
held.
If synchronous operation is
not to be used for the Seg-
ment Program 2 block speci-
fied as the slave, download
the setting that was changed
during operation (as given in
the Explanation column) to
the flash memory.
When the Segment Program
2 block is to be used as a
slave, specify the correct
block address in the “syn-
chronous operation reference
parameter designation” for
the Segment Program 2 used
as the master.
20 Download termi-
nal data exchange
error
Data exchange with the CPU
Unit is not being executed
correctly on Field Terminal
blocks.
The data of the function block
in question is not updated.
If a malfunction has occurred
on the CPU Unit, follow the
remedy for that error. If the
CPU Unit is normal, turn ON
the power supply again.
Code Description Explanation Operation at error Remedy
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