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8
Protocol Overview
Section 1-3
2.
A 1:1 NT Link is not supported.
3.
No-protocol mode can be used with CS/CJ-series CPU Units with Unit Ver.
3.0 or later only.
A connection example for each serial communications mode is shown in the
following sections for a Serial Communications Unit. The examples apply
equally as well to the Serial Communications Boards.
1-3-1
Host Link Mode
In Host Link mode, C-mode commands (Host Link commands) or FINS com-
mands can be sent from a host computer to read or write I/O memory in the
PLC or to control the PLC’s operating modes. The host computer can be a
personal computer or a Programmable Terminal. The FINS commands are
sent with other data, such a Host Link header and terminator.
In Host Link mode, SEND(090), RECV(098), and CMND(490) instructions can
be used to send FINS commands from PLC to the host computer to read
data, write data, or perform other operations. This is called slave-initiated
communications or unsolicited communications. The FINS commands are
sent with other data, such a Host Link header and terminator.
Note
1.
FINS commands can be sent across up to three different networks (count-
ing the local network) to a PLC on a remote network or to a host computer
connected to a PLC on a remote network.
2.
Programming Devices can also be connected in Host Link mode.
Sending C-mode Commands
Sending FINS Commands
Host Link
C-mode (Host Link)
command
FINS
command
Host Link
Host Link
header
Host Link
terminator
FINS commands can also be sent to
PLCs on remote networks.
FINS
command
Host Link
Host Link
header
Host Link
terminator
FINS command
Remote network
(Controller Link or
Ethernet)
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...