217
Protocol Conversion
Section 6-5
1:N RS-485 Connection Example Using RS-422A/485 Port
Note
Be sure to connect terminating resistance of between 100 and 125
Ω
(1/2 W)
to the terminals of the remote devices at either end of the RS-422A/485 trans-
mission path. (Set the terminating resistance on the Board/Unit by turning
ON/OFF the Terminating Resistance Switch.)
6-5-4
Converting FINS to Modbus-RTU
Modbus-RTU Slave-compatible devices (including OMRON Inverters) con-
nected serially to a PLC via Modbus-RTU can be accessed from the PLC or
PT using Modbus-RTU commands enclosed in FINS messages.
• Sent FINS message: FINS FINS command code 2804 hex +
Modbus-RTU command
• Message after conversion: Modbus-RTU command
Modbus-RTU Slave-compatible OMRON Devices
Serial Communications Board/Unit
Pin No.
Shell
D-Sub 9-pin (cable connector type: Male)
Signal
name
RS-422A/485
interface
Component with RS-422A/485
communications function
(2-wire method)
Signal
name
RS-422A/485
interface
Component with RS-422A/485
communications function
(2-wire method)
Signal
name
RS-422A/485
interface
Type
Model series
Inverters
3G3JV
3G3MV
3G3RV
Temperature Controllers
E5CN (New version)
FINS header
Modbus-RTU command
2804
(Via network or CPU bus)
Modbus-RTU command
Modbus-RTU command
(RS-232C or RS-422A/485)
CPU Unit
(CMND(490)
instruction) or
PT (Program-
mable Termi-
nal)
Modbus-RTU command encapsulated
using FINS command 2804 hex
Serial Com-
munications
Unit/Board
Modbus-RTU
Slave-
compatible
device
(OMRON
Inverter, etc.)
Содержание SYSMAC CJ1W-SCU21-V1
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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...