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9 Troubleshooting and Maintenance
9-12
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
The serial commu-
nications mode is
set to No-protocol
Mode. --- With Unit: The
SerialRcv or
SerialRcvNo-
Clear instruc-
tion was
executed, but
data was not
received. The Error output variable from the
SerialRcv or SerialRcvNoClear
instruction is TRUE. • This instruction
was executed
when the Serial
Communications
Mode was not No-
protocol Mode.
• _Port_isAvailable
is set to FALSE.
• The value of
Port.UnitNo or
Port.PhysicPortNo
is out of the valid
range.
• The Serial Com-
munications Unit is
not mounted at the
specified Unit
number.
• The value of Store-
Size is out of valid
range.
• The value of Store-
Size exceeds the
size in DstDat[].
• This instruction
was executed
while the unit was
restarting.
• Review the set-
tings in the Serial-
Rcv or
SerialRcvNoClear
instruction.
• Review the pro-
gram for instances
where the causes
specified on the
left might occur.
Command end code:
2201 hex (not possi-
ble during execu-
tion) was returned.
If the SerialRcv or
SerialRcvNoClear
instruction was exe-
cuted, the operation
is disabled because
the port is busy
receiving data.
Insert an AND in the
input condition for a
Network Communi-
cations Instruction
Enabled Flag
(_Port_isAvailable).
Command end code:
2202 hex (not possi-
ble while stopped)
was returned. Exe-
cution is not possible
while the protocol is
switched. Insert an AND in the
input condition for an
N.C. of the Serial
Communications
Unit's Port 1/2 Set-
tings Changing Flag
(_CJB_SCU**P1(orP
2)ChgSta: Unit num-
ber **).
Error conditions Confirmation of device
variable for CJ-series Unit, etc.
Cause Remedy
Serial
communications
mode
Indicator
display
Status and
other
conditions