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9-9
9 Troubleshooting and Maintenance
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
9-3 T
rou
b
lesho
o
ting
9
9-3-1 Ser
ial Gat
e
w
a
y (Ser
ia
l Gate
w
a
y or Protocol Macro
Mode)
z
Cause and Countermeasure by Command End Code
Main response code
(hex)
Sub response code
(hex)
Check point Possible cause Remedy
Value Details Value Details
00 Normal end 00 Normal end --- --- ---
04 Destination
busy *_P1(orP2)_Timeout
Err (Timeout Error) The Serial Gateway
function cannot be
executed by interrupt-
ing the macro
between protocol
macro steps. Retry the command or correct the com-
munications sequence.
02 Destination
error 05 Response
timeout at
command
source side *_P1(orP2)_Timeout
Err (Timeout Error) When the message
frame is damaged by
noise. If *_P1(orP2)_TimeoutErr is TRUE,
assume that the command source gener-
ated a response timeout.
• Check the noise condition by an inter-
node test.
• Increase the number of resends at the
command source.
• Perform communications retry if
required.
Instruction control
data Response monitor-
ing time is short. Set a longer parameter value for
response monitoring time.
Error log read Discarding of send
and receive frame Take the correct action after checking the
error log.
Serial gate-
way
response
timeout *_P1(orP2)_Timeout
Err (Timeout Error) Serial Gateway
Response Timeout
occurred. If *_P1(orP2)_TimeoutErr is set to TRUE,
assume that the Serial Gateway gener-
ated a response timeout and take the
appropriate actions.
06 Transmis-
sion line
error *_P1(orP2)_FCSErr
(FCS Check Error) or
*_P1(orP2)_ParityErr
(Parity Error) • Conversion to
CompoWay/F com-
mand: BCC error or
parity error
• Conversion to Mod-
bus-RTU com-
mand: CRC error or
parity error
• Conversion to Mod-
bus-ASCII com-
mand: CRC error or
checksum error
Use shielded twisted-pair cables.
Lay power lines separately by using
ducts.
Increase the number of resends at the
command source.
Perform communications retry as
required.
10 Command
format error 01 Command
packet too
long Command data Command length is
long. Set the command data correctly by refer-
ring to the command format.
02 Insufficient
command
length Command data Command length is
short. Set the command data correctly by refer-
ring to the command format.
11 Parameter
error 0C Parameter
error Parameters in com-
mand data Parameter is not set
correctly. Set the parameters again, this time cor-
rectly, after you check the command
data.
26 Command
error 05 Service exe-
cuting --- Service executing
(The serial communi-
cations port received
a sixth command
when five commands
are still waiting for
processing.) Add retry processing on the command
source for response code 2605 hex.
07 No right to
execute ser-
vice Serial Gateway pro-
hibited or not *_P1(orP2)_PmrSgw
ProhSta (Serial Gate-
way Prohibited Flag
(Protocol Macros)) is
set to TRUE. While the Serial Gateway is prohibited,
set *_P1(orP2)_SgwDsblCmd (Serial
Gateway Prohibit Switch (Protocol Mac-
ros)) from TRUE to FALSE.