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9-41
9 Troubleshooting and Maintenance
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
9-5 Even
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9-5-3 Error De
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Event name Protocol Macro Error Event code 54AA 0000 hex
Meaning An error occurred in the protocol macro.
Source PLC Function Module Source details CJ-series Unit Detection
timing At protocol macro
execution
Error attributes Level Observation Recovery --- Log category System
Effects User program Continues. Operation Not affected.
System-defined
variables Variable Data type Name
None --- ---
Cause and
correction Assumed cause Correction Prevention
Sequence No. Error: An unregistered
number was specified for SeqNo
(communications sequence number)
of the ExecPMCR instruction (no indi-
cators light). Correct the communications
sequence number. Register a
sequence with the specified number
from the CX-Protocol. Specify a registered sequence num-
ber.
Data read/write area exceeded error:
The specified area range was
exceeded when data was written to or
read from the CPU Unit. (The ERC
indicator and ERR/ALM indicator will
flash.) • For operand specification, review
the SrcDat[ ] and DstDat[ ] arrays
for the ExecPMCR instruction.
• If a link word or direct specification
is used, review the specification
range from the CX-Protocol.
Do not exceed the specified area
range when you write data to or read
from the CPU Unit.
Protocol data syntax error: There was
a code that cannot be executed dur-
ing protocol execution. (The ERC indi-
cator and ERR/ALM indicator will
flash.)
• The total of the areas specified for
link words O1, O2, I1, and I2
exceeded 500 words.
• The same link word is used by both
ports 1 and 2.
• Writing was specified with a con-
stant.
• Interrupt notification was specified
for a Serial Communications Unit.
• Thirty one or more items were set
for the write attribute data for one
message.
• A length of 0 bytes was specified for
a message that was sent or
received.
• The length of a message to be sent
or received exceeds the maximum
send/receive bytes.
• A message is not registered for
matrix reception.
• The transmission control is set to
both RTS/CTS flow control and
Xon/Xoff flow control.
Check to see if any of the conditions
that are given as causes exits and
correct any problems. Check to see if any of the conditions
that are given as causes apply.
Attached
information Attached information 1: Port number where error was detected
Precautions/
Remarks None