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Troubleshooting Section 11-3
Note The following table shows the measures to correct the errors indicated in bits
00 to 03 (Error Code) of words allocated in the CIO Area words n+9/n+19.
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 communica-
tions sequence
number specified in
the PMCR(260)
instruction’s C2
operand is not reg-
istered.
Correct the communications sequence
number.
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 being written
to or read from the
I/O memory of the
CPU Unit.
For operand specification:
Check the PMCR(260) instruction S and
D operand specifications.
For direct specification of link words:
Use CX-Protocol to check the specified
range.
4 Hex ERC:
Flashing
ERR/
ALM:
Flashing
Protocol data
syntax error
There is a code that
cannot be executed
during protocol exe-
cution.
Check the following items and correct the
problem.
• Check whether the total specified num-
ber of link words in the area (O1, O2,
I1, I2) exceeds 500.
• The same area with link word specifi-
cation is used by both ports 1 and 2.
• A write instruction with constant speci-
fication is specified.
• An EM Area read/write instruction is
specified as an interrupt notification
(for Boards only).
• An interrupt notification is specified at
the Unit (for Units only).
• 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
transmission line.
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