
2.LCD-MOUNTED TYPE 16i/18i/21i-A, Power Mate i-D/H OPERATION B-62714EN/04
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LINK STATUS with the master station
Link status with the master station (1 byte):
The detailed status of communication of the master station are
indicated as follows:
"NO" : Slave station number of the local station
"LINK" : Status of the link with the master station
"SERV" : Code representing a service where an error was
detected
"LAYR" : Code representing a communication layer where an
error was detected
"CODE" : Code representing the cause of an error
Table III-2-6 indicates the communication status patterns indicated by
LINK STATUS.
Table III-2-6
LINK SERV LAYR CODE Description Cause/action
ON 00H 00H 00H
Input/output normal:
Input/output service is being
performed with the master station
normally.
---------------------
OFF 00H 00H 00H
Disconnected:
Communication with the master
station is disconnected.
Turn on the power to the master station
or make the master station ready for
communication.
ER01 30H 81H 20H
Initialization instruction rejected:
An attempt by the master station to
perform initialization service for the
slave station is rejected by the slave
station because of an initialization
parameter mismatch.
Check the initialization parameters (I/O
SIZE, slave type) of the master station
and slave station.
ER02 30H 80H A1H
DL_len invalid:
When input/output service is
performed, the data length of a
request frame from the master station
is invalid.
If this error occurs frequently, first check
for hardware failures (on communication
boards, communication cables) and
check noise protection. If this error still
occurs, ask the manufacturer of the
master station to make a check.
NOTE
1 The codes indicated by SERV, LAYR, and CODE
are defined by OPCN-1. When asking the
manufacturer of the master station to make a check,
inform the manufacturer of these codes.
2 LINK STATUS provides a real-time communication
status indication. So, for an error that periodically
occurs, the indication blinks.