Omron CP1H CPU Operation Manual page 383

Serial Communications
Polling Unit Link Method
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.
Polling Unit Polled Unit No.0
Local area Polling Unit
Polled Unit
Local area
No.0
Polled Unit
No.1
Undefined Undefined
Polled Unit
No.3
(Not used) (Not used)
(Not used) (Not used)
(Not used) (Not used)
(Not used) (Not used)
Example: Complete Link Method, Number of Link Words: 10
Each CPU Unit (either CP1H 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
CP1H CPU Unit in the following example, but it could also be a CJ1M CPU
Unit.
CP1H CPU Unit CP1H CPU Unit
(Polling Unit) (Polled Unit No. 0)
Serial PLC Link Words
(CIO Area)
3100 to 3109
No.0 3110 to 3119
No.1 3120 to 3129
3130 to 3139
No.2
No.3 3140 to 3149
3150 to 3159
No.4
3160 to 3169
No.5
3170 to 3179
No.6
3180 to 3189
No.7
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.
Polled Unit No.1
Polling Unit
Polled Unit
No.0
Polled Unit
Local area
No.1
Undefined
Polled Unit Polled Unit
No.3 No.3
(Not used)
(Not used)
(Not used)
(Not used)
CP1H CPU Unit
(Polled Unit No. 1)
Serial PLC Link Words Serial PLC Link Words
(CIO Area) (CIO Area)
3100 to 3109
3100 to 3109
No.0
No.0 3110 to 3119 3110 to 3119
No.1 No.1 3120 to 3129
3120 to 3129
No.2 3130 to 3139 No.2 3130 to 3139
3140 to 3149
No.3 3140 to 3149 No.3
3150 to 3159 No.4 3150 to 3159
No.4
No.5 3160 to 3169 No.5 3160 to 3169
3170 to 3179 3170 to 3179
No.6 No.6
3180 to 3189 3180 to 3189
No.7 No.7
Section 6-1
Polled Unit No.3
Polling Unit
Polled Unit
No.0
Polled Unit
No.1
Undefined
Local area
(Not used)
(Not used)
(Not used)
(Not used)
CJ1M CPU Unit
(Polled Unit No. 2)
Serial PLC Link Words
(CIO Area)
3100 to 3109
No.0
3110 to 3119
No.1 3120 to 3129
No.2 3130 to 3139
3140 to 3149
No.3
No.4 3150 to 3159
No.5 3160 to 3169
3170 to 3179
No.6
3180 to 3189
No.7
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