117
Serial PLC Link Area
Section 4-4
4-4
Serial PLC Link Area
The Serial PLC Link Area contains 1,440 bits (90 words) with addresses rang-
ing from CIO 3100.00 to CIO 3189.15 (CIO 3100 to CIO 3189).
Words in the Serial PLC Link Area can be used for data links with other PLCs.
Serial PLC Links exchange data among CPU Units via the built-in RS-232C
ports, with no need for special programming.
The Serial PLC Link allocations are set automatically by means of the follow-
ing PLC Setup in the Polling Unit.
• Serial PLC Link Mode
• Number of Serial PLC Link transfer words
• Maximum Serial PLC Link unit number
Addresses not used for Serial PLC Links can be used in programming, the
same as the Work Area.
Forcing Bit Status
Bits in the Serial PLC Link Area can be force-set and force-reset.
Serial PLC Link Area
Initialization
The contents of the Serial PLC Link Area will be cleared in the following
cases:
1.
When the operating mode is changed from PROGRAM mode to
RUN/MONITOR mode or vice-versa and the IOM Hold Bit is OFF
2.
When the power is cycled
3.
When the Serial PLC Link Area is cleared from the CX-Programmer
4.
When PLC operation is stopped when a fatal error other than an
FALS(007) error occurs (The contents of the Serial PLC Link Area will be
retained when FALS(007) is executed.)
CP1L-EL/EM
CPU Unit
CP1L-EL/EM
CPU Unit
CJ1M CPU
Unit
RS-232C
port
RS-232C
port
Serial PLC Link
Serial PLC
Link Area
RS-232C
port
Summary of Contents for CP1L-EL20DR-D
Page 3: ...CP1L EL20D CP1L EM30D CP1L EM40D CP1L EL EM CPU Unit Operation Manual Produced July 2017...
Page 4: ...iv...
Page 10: ...x...
Page 22: ...xxii...
Page 34: ...xxxiv Software Licenses and Copyrights 7...
Page 192: ...158 Trial Operation and Debugging Section 5 3...
Page 250: ...216 Automatic Clock Adjustment and Specifying Servers by Host Name Section 6 7...
Page 666: ...632 Trouble Shooting Section 11 7...
Page 696: ...662 Standard Models Appendix A...
Page 805: ...771 Connections to Serial Communications Option Boards Appendix F Connecting to Unit...
Page 806: ...772 Connections to Serial Communications Option Boards Appendix F...
Page 836: ...802 PLC Setup Appendix G...
Page 838: ...804 TCP Status Transitions Appendix H...
Page 840: ...806 Ethernet Network Parameters Appendix I...
Page 842: ...808 Buffer Configuration CP1L EL EM Appendix J...
Page 844: ...810 Ethernet Specifications Appendix K...
Page 851: ...Index 817 work words 118 write protection 447...
Page 852: ...818 Index...
Page 854: ...820 Revision History...
Page 855: ......