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341
Troubleshooting
Section 11-3
Serial com-
munica-
tions mode
is set to
protocol
macro.
The SD
@
/
RD
@
and
COM
@
indi-
cators are
flashing, but
the Unit or
Board can-
not perform
communi-
cations or a
communi-
cations
error some-
times
occurs.
A transmission
error some-
times occurs.
Bit 15 (Transmission
Error) of the words
allocated in the CIO
Area n+8/n+18 is set
to ON.
There is an error in
bits 0 to 14.
The wiring is faulty.
The RS-422A/485 port
terminating resistance
setting is incorrect.
Adapters such as the NT-
AL001-E are incorrectly
wired, or the terminating
resistance setting is
incorrect.
Check the wiring.
Turn ON the terminating
resistance of the Board
and the last node by
using the terminating
resistance switch. Turn
OFF the terminating
resistance of other
nodes.
A communications error
frequently occurs due to
noise and so on.
Use shielded twisted pair
cables.
House the communica-
tions cables in a different
duct from those for power
lines and so on.
Review the operating
environment to prevent
noise problems.
Programming retry pro-
cessing for communica-
tions if necessary.
The RDY
and ERC
indicators
are flash-
ing (ERR/
ALM).
---
Bit 00 (Protocol Data
Error) of the words
allocated in the CIO
Area n+1 is set to
ON.
The protocol macro data
SUM value is abnormal.
Use CX-Protocol to trans-
fer the correct protocol
data.
The RDY
indicator is
lit and the
ERC indica-
tor is flash-
ing (ERR/
ALM).
---
Bits 00 to 03 (Port
Status Error Code)
of the words allo-
cated in the CIO
Area n+9/n+19 are
set to a value other
than 0 Hex. (An error
has occurred.)
An error has been
detected in the protocol
macros, making the oper-
ation impossible.
See note on
page 343
Serial
communi-
cations
mode
Indicator
display
Status
information,
etc.
Words allocated in
the CIO Area
Cause
Remedy
Summary of Contents for SYSMAC CJ1W-SCU21-V1
Page 3: ...iv...
Page 5: ...vi...
Page 9: ...x...
Page 15: ...xvi...
Page 89: ...60 Basic Operating Procedure Section 1 9...
Page 151: ...122 RS 232C and RS 422A 485 Wiring Section 3 4...
Page 173: ...144 Host Link Function for Replacing Existing PLCs Section 4 6...
Page 223: ...194 Enhanced Protocol Macro Functions Section 5 6...
Page 277: ...248 Communications Frames Section 6 8...
Page 291: ...262 Basic Operating Procedure in No protocol Mode Section 7 4...
Page 301: ...272 Auxiliary Area and CIO Area Allocations Section 8 3...
Page 391: ...362 Introduction Appendix A...
Page 421: ...392 CompoWay F Master Protocol Appendix B...
Page 513: ...484 E5 K Digital Controller Read Protocol Appendix F...
Page 571: ...542 E5ZE Temperature Controller Write Protocol Appendix I...
Page 587: ...558 E5 J Temperature Controller Protocol Appendix J...
Page 627: ...598 ES100 Digital Controller Protocol Appendix K...
Page 661: ...632 V500 V520 Bar Code Reader Protocol Appendix M...
Page 697: ...668 3Z4L Laser Micrometer Protocol Appendix N...
Page 717: ...688 Visual Inspection System Protocol Appendix O...
Page 755: ...726 V600 V620 ID Controller Protocol Appendix P...
Page 763: ...734 Hayes Modem AT Command Protocol Appendix Q...
Page 767: ...738 Changing Communications Port Settings Using STUP 237 Appendix R...
Page 781: ...752 Revision History...