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290
Communications Timing
Section 9-4
Error Format
9-4
Communications Timing
This section describes the timing of sending commands and controlling com-
munications in the Modbus-RTU Slave mode.
9-4-1
Simultaneous Commands and Communications Ports
The CS/CJ-series CPU Units provide eight logical ports that can be used
when executing SEND(090), RECV(098), and CMND(490). Therefore, up to
eight commands can be executed for one physical port during any one cycle.
The maximum number of messages, however, that can be sent or received in
one CPU Bus Unit service time is two messages from the CPU Unit to the
Board or Unit and two messages from the Board or Unit to the CPU Unit.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
D1000
3
A
C
5
D1001
9
7
1
3
Length
Data
Function Code
1 byte
Function code + 80 hex
Exception Code
1 byte
Error code
Error
code
Name
Description
01
Illegal function
• There is an error in the specified function code.
• A function code not supported by the Serial Com-
munications Board/Unit was specified.
02
Illegal data address
• There is an error in the specified starting address.
• The combination of the specified starting address
and data length (quantity of registers/coils) exceeds
the valid range.
• The specified data length (quantity of registers/
coils) exceeds the valid range.
• The specified data length (quantity of registers/
coils) differs from the actual data length.
• Less than 4 bytes of data was received.
03
Illegal data value
• There is an error in the specified data. (The data for
the Write Single Coil Command is not 0000 hex or
FF00 hex.)
04
Slave device failure
• Reading or writing could not be performed because
an error occurred in the CPU Unit.
Содержание SYSMAC CJ1W-SCU21-V1
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Страница 5: ...vi...
Страница 9: ...x...
Страница 15: ...xvi...
Страница 89: ...60 Basic Operating Procedure Section 1 9...
Страница 151: ...122 RS 232C and RS 422A 485 Wiring Section 3 4...
Страница 173: ...144 Host Link Function for Replacing Existing PLCs Section 4 6...
Страница 223: ...194 Enhanced Protocol Macro Functions Section 5 6...
Страница 277: ...248 Communications Frames Section 6 8...
Страница 291: ...262 Basic Operating Procedure in No protocol Mode Section 7 4...
Страница 301: ...272 Auxiliary Area and CIO Area Allocations Section 8 3...
Страница 391: ...362 Introduction Appendix A...
Страница 421: ...392 CompoWay F Master Protocol Appendix B...
Страница 513: ...484 E5 K Digital Controller Read Protocol Appendix F...
Страница 571: ...542 E5ZE Temperature Controller Write Protocol Appendix I...
Страница 587: ...558 E5 J Temperature Controller Protocol Appendix J...
Страница 627: ...598 ES100 Digital Controller Protocol Appendix K...
Страница 661: ...632 V500 V520 Bar Code Reader Protocol Appendix M...
Страница 697: ...668 3Z4L Laser Micrometer Protocol Appendix N...
Страница 717: ...688 Visual Inspection System Protocol Appendix O...
Страница 755: ...726 V600 V620 ID Controller Protocol Appendix P...
Страница 763: ...734 Hayes Modem AT Command Protocol Appendix Q...
Страница 767: ...738 Changing Communications Port Settings Using STUP 237 Appendix R...
Страница 781: ...752 Revision History...