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Errors that May Occur in Remote I/O Communications Section 4-7
4-7 Errors that May Occur in Remote I/O Communications
The following errors may occur during remote I/O communications.
Condition Error Details Results Indicators 7-
segment
display
Error
occurs in
fixed allo-
cations
with the
scan list
disabled
Structure
Error Flag
(word n+12,
bit 04) turns
ON
Duplicate I/
O area
The same I/O word is allocated to
two or more slaves. (This occurs
whenever a slave that is allocated
multiple words has one of the
words allocated to the node
address of another Slave.)
Reconnect with
the error slave
and continue
remote I/O com-
munications.
MS: Not
related
NS:
Flashes
red
d0
I/O area
range
exceeded
A slave is allocated an area out-
side the fixed allocations area.
(This occurs whenever slaves are
allocated multiple words and a
slave is allocated a word beyond
node address 63 in the fixed allo-
cations area.)
d1
Unsup-
ported
Slave
The I/O size of a slave exceeds
200 bytes (100 words). (This
occurs if either the IN or the OUT
size exceeds 200 bytes.)
d2
Error
occurs in
either fixed
or user-set
allocations
with the
scan list
enabled
Verification
Error Flag
(word n+12,
bit 00) turns
ON
No slaves
present
A Slave registered in the scan list
is not present.
d5
I/O size
mis-
matched
The I/O size registered in the scan
list does not match the I/O size of
the slave.
Note I/O size is compared in 8-
point (1-byte) units. If I/O
size is registered at 8
points for example, then an
error I/O size mismatch will
not occur with a Slave with
just one input point con-
nected.
d6
Incorrect
vendor
The vendor registered in the scan
list does not match the slave ven-
dor.
d6
Incorrect
device type
The device type registered in the
scan list does not match the slave
device type.
d6
Incorrect
product
code
The product code registered in the
scan list does not match the slave
product code.
d6
Incorrect
connection
bus
The connection bus registered in
the scan list is set incorrectly.
d6
Unsup-
ported con-
nection
The slave does not support the
connection registered in the scan
list.
d6