413
Serial Communications
Section 8-3
Complete Link Method
The data from all nodes in the Serial PLC Links are reflected in both the Poll-
ing Unit and the Polled Units. (The only exceptions are the address allocated
to the connected PT’s unit number and the addresses of Polled Units that are
not present in the network. These data areas are undefined in all nodes.)
Example: Complete Link Method, Highest Unit Number: 3
In the following diagram, Polled Unit No. 2 is either a PT or is a Unit not
present in the network, so the area allocated for Polled Unit No. 2 is undefined
in all nodes.
Example: Complete Link Method, Number of Link Words: 10
Each CPU Unit (either CP1L-EL/EM or CJ1M) sends data to the same words
in all other CPU Units for the Polling Unit and all Polled Units. The Polling Unit
is a CP1L-EL/EM CPU Unit in the following example, but it could also be a
CJ1M CPU Unit.
Polling Unit Link Method
The data for all the Polled Units in the Serial PLC Links ar reflected in the Poll-
ing Unit only, and each Polled Unit reflects the data of the Polling Unit only.
The advantage of the Polling Unit link method is that the addresses allocated
for the local Polled Unit data are the same in each Polled Unit, allowing data to
be accessed using common ladder programming. The areas allocated for the
unit numbers of the PT or Polled Units not present in the network are unde-
fined in the Polling Unit only.
Polling Unit
Polled Unit No.0
Polled Unit No.1
Polled Unit No.3
Local area
Polling Unit
Polling Unit
Polling Unit
Polled Unit
No.0
Local area
Polled Unit
No.0
Polled Unit
No.0
Polled Unit
No.1
Polled Unit
No.1
Local area
Polled Unit
No.1
Undefined
Undefined
Undefined
Undefined
Polled Unit
No.3
Polled Unit
No.3
Polled Unit
No.3
Local area
(Not used)
(Not used)
(Not used)
(Not used)
(Not used)
(Not used)
(Not used)
(Not used)
(Not used)
(Not used)
(Not used)
(Not used)
(Not used)
(Not used)
(Not used)
(Not used)
MAC Address:
01234567890A
00
NC
02
04
06
08
10
00
02
04
06
08
10
01
COM
03
05
07
09
11
01
03
05
07
09
11
BKUP
ERR/ALM
LNK/ACT
SYSMAC
CP1L
POWER
RUN
INH
1
00
01
02
03
04
06
00
01
03
04
06
COM
02
COM
05
07
COM
COM(V+)
05
07
ANALOG INPUT
V1+ V2+ COM
2
MAC Address:
01234567890A
00
NC
02
04
06
08
10
00
02
04
06
08
10
01
COM
03
05
07
09
11
01
03
05
07
09
11
BKUP
ERR/ALM
LNK/ACT
SYSMAC
CP1L
POWER
RUN
INH
1
00
01
02
03
04
06
00
01
03
04
06
COM
02
COM
05
07
COM
COM(V+)
05
07
ANALOG INPUT
V1+ V2+ COM
2
MAC Address:
01234567890A
00
NC
02
04
06
08
10
00
02
04
06
08
10
01
COM
03
05
07
09
11
01
03
05
07
09
11
BKUP
ERR/ALM
LNK/ACT
SYSMAC
CP1L
POWER
RUN
INH
1
00
01
02
03
04
06
00
01
03
04
06
COM
02
COM
05
07
COM
COM(V+)
05
07
ANALOG INPUT
V1+ V2+ COM
2
No.0
No.1
No.2
No.3
No.4
No.5
No.6
No.7
3100 to 3109
3110 to 3119
3120 to 3129
3130 to 3139
3140 to 3149
3150 to 3159
3160 to 3169
3170 to 3179
3180 to 3189
Serial PLC Link Words
(CIO Area)
No.0
No.1
No.2
No.3
No.4
No.5
No.6
No.7
3100 to 3109
3110 to 3119
3120 to 3129
3130 to 3139
3140 to 3149
3150 to 3159
3160 to 3169
3170 to 3179
3180 to 3189
No.0
No.1
No.2
No.3
No.4
No.5
No.6
No.7
3100 to 3109
3110 to 3119
3120 to 3129
3130 to 3139
3140 to 3149
3150 to 3159
3160 to 3169
3170 to 3179
3180 to 3189
No.0
No.1
No.2
No.3
No.4
No.5
No.6
No.7
3100 to 3109
3110 to 3119
3120 to 3129
3130 to 3139
3140 to 3149
3150 to 3159
3160 to 3169
3170 to 3179
3180 to 3189
CP1L-EL/EM CPU Unit
(Polling Unit)
Serial PLC Link Words
(CIO Area)
CP1L-EL/EM CPU Unit
(Polled Unit No. 0)
Serial PLC Link Words
(CIO Area)
CP1L-EL/EM CPU Unit
(Polled Unit No. 1)
Serial PLC Link Words
(CIO Area)
CJ1M CPU Unit
(Polled Unit No. 2)
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: ......