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335
Troubleshooting
Section 11-3
11-3-4 1:N NT Link Mode
Serial commu-
nications mode
Indicator
display
Status
information,
etc.
Words allo-
cated in the
CIO Area
Cause
Remedy
Serial communi-
cations mode is
not set to NT
Link.
---
---
Bits 12 to 15 of
the words allo-
cated in the CIO
Area n+5/n+15
are set to a
value other than
2 Hex.
Serial communica-
tions mode is not set
correctly.
Review the Setup Area set-
tings.
Serial communi-
cations mode is
set to NT Link.
The SD
@
/RD
@
and COM
@
indi-
cators do not
flash at all.
(Communica-
tions have not
been electri-
cally estab-
lished.)
---
---
This is a hardware
error.
Conduct a loopback test in
serial communications
mode to check the trans-
mission lines. If an error
occurs during the test,
replace the Board or Unit.
The SD
@
and
COM
@
indica-
tors are flashing,
but the Unit or
Board cannot
communicate
with the Pro-
grammable Ter-
minal (PT).
---
---
The baud rate set-
ting is different to the
PT’s baud rate set-
ting.
Either change the baud rate
setting in the System Setup
or change the baud rate
setting for the PT.
There is a setting
error for the PT serial
port.
Correct the PT serial port
settings.
The 1:N NT Link unit
number of the PT is
incorrect.
The same 1:N NT
Link unit number has
been set for more
than one PT
Review the NT Link unit
number of the PT.
The maximum allow-
able NT Link unit
number is incor-
rectly set for the sys-
tem.
Review the Setup Area set-
tings.
Cables are incor-
rectly connected.
The RS-422A/485
port setting (2-wire
or 4-wire) is incor-
rect.
Adapters such as the
NT-AL001-E are
incorrectly wired or
set.
Review the wiring or switch
settings.
A communications
error frequently
occurs due to noise,
etc.
Review the wiring and
installation environment.
There is a PT hard-
ware error.
Replace the PT.
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...