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9-21
9 Troubleshooting and Maintenance
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
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9
9-3-3 Proto
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ol Macros
The following table shows the measures to correct the errors indicated in bits 00 to 03 (Error code) of
*_P1(or P2)_PmrSta.
Note For details on the protocol macros, refer to the CX-Protocol Ver.1.9 OPERATION MANUAL (Cat.
No. W344).
Remedy for Each Protocol Macro Error Code
Error
code
Indicator Error details Cause Remedy
0 Hex No display Normal --- ---
1 Hex No display Reserved --- ---
2 Hex No display Sequence num-
ber error The communications sequence
number specified in the Exec
PMCR instruction's SeqNo oper-
and which is not registered. Correct the communications sequence num-
ber.
Use CX-Protocol to register the specified
communications sequence number.
3 Hex ERC:
Flashing
ERR/ALM:
Flashing Data read/write
range error The data range of the specified
area is exceeded when data is
written to or read from the
CPU Unit. For operand specification:
Check the in-out variable settings for the
ExecPMCR instruction.
For direct specification of link words:
Use CX-Protocol to check the specified
range.
4 Hex ERC:
Flashing
ERR/ ALM:
Flashing Protocol data syn-
tax error There is a code that cannot be
executed during protocol execu-
tion. Check the following items and correct the
problem.
• Check whether the total specified number
of link words in the area (O1, O2, I1, I2)
exceeds 500 words.
• The same area with link word specification
is used by both ports 1 and 2.
• A write instruction with constant specifica-
tion is specified.
• An interrupt notification is specified at the
Unit.
• There are more than 30 write attributes set
for one message.
• The length of a send/receive message is
set to 0 bytes.
• The length of a send/receive message is
longer than the maximum send/receive
message bytes setting.
• No messages are registered for matrix
reception.
• Both RTS/CTS flow control and Xon/Xoff
flow control are set for the same transmis-
sion line.