Omron CJ1W-SCU32 Operation Manual page 293

Error conditions
Serial Indicator
communications display
mode
The serial commu- ---
nications mode is
set to No-protocol
Mode.
---
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
Confirmation of device variable
for CJ-series Unit, etc.
Status
and other
conditions
The SerialSend The output variable Error of the
instruction was SerialSend instruction is TRUE.
executed, but
sending was
not executed.
---
9 Troubleshooting and Maintenance
Cause
• This instruction
was executed
when the Serial
Communica-
tions Mode was
not No-protocol
Mode.
• _Port_isAvailable
is set to FALSE.
• The value of
Port.UnitNo or
Port.Phys-
icPortNo is out of
the valid range.
• The Serial Com-
munications Unit
is not mounted
at the specified
Unit number.
• The value of
SendSize is out
of valid range.
• The value of
SendSize
exceeds the size
in SrcDat[].
• This instruction
was executed
while the unit
was restarting.
Command end
code: 2201 hex
(not possible dur-
ing execution) was
returned.
If the SerialSend
instruction was
executed, the
operation is dis-
abled because the
port was busy
while sending.
Command end
code: 2202 hex
(not possible while
stopped) was
returned. Execu-
tion is not possible
while the protocol is
switched by using
the SerialSetUp
instruction.
A hardware error
occurred in the
transmission cir-
cuit.
Remedy
• Review the setting
contents for the
SerialSend instruc-
tion.
• Review the pro-
gram for instances
where the causes
specified on the left
might occur.
Insert an AND in the
input condition for an
N.C. of the Seri-
alSend Executing
Flag
(*_P1(orP2)_NopSeri
alSendExecSta).
9
Insert an AND in the
input condition for an
N.C. of the Serial
Communications
Unit's Port Settings
Change Bit
(_CJB_SCU**P1(orP
2)ChgSta: Unit num-
ber **).
Conduct a loopback
test in serial commu-
nications mode to
check the transmis-
sion lines. If an error
occurs during the
test, replace the Unit.
9-15