Omron CP1E CPU UNIT SOFTWARE User Manual page 251

Polling Unit Link Method
The data for all the Polled Units in the Serial PLC Links are reflected in the Polling 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 program-
ming.
The areas allocated for Polled Units not present in the network are undefined in the Polling Unit only.
Example: Polling Unit Link Method, Highest Unit Number: 3
In the following diagram, Polled Unit No. 2 is a Unit not participating in the network, so the corre-
sponding area in the Polling Unit is undefined.
Polling Unit
Local area
Polled Unit No. 0
Polled Unit No. 1
Undefined
Polled Unit No. 3
(Not used)
(Not used)
(Not used)
(Not used)
Example for Ten Link Words (Maximum Number of Words)
The CPU Unit that is the Polling Unit (either CP1E, CP1H, CP1L, or CJ1M) sends its data (CIO 200
to CIO 209) to the same words (CIO 200 to CIO 209) in all other CPU Units.
The Polled Units (either CP1E, CP1H, CP1L, or CJ1M) send their data (CIO 210 to CIO 219) to con-
secutive sets of 10 words (CIO 210 to CIO 289) in the Polling Unit.
CP1E N/NA-type CPU Unit
(Polling Unit)
Serial PLC Link Words
CIO 200 to 209
CIO 210 to 219
No.0
CIO 220 to 229
No.1
CIO 230 to 239
No.2
CIO 240 to 249
No.3
CIO 250 to 259
No.4
CIO 260 to 269
No.5
CIO 270 to 279
No.6
CIO 280 to 289
No.7
CP1E CPU Unit Software User's Manual(W480)
Polled Unit No. 1
Polled Unit No. 0
Polling Unit Polling Unit
Local area
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)
CP1E N/NA-type CPU Unit
(Polled Unit No. 0)
Serial PLC Link Words
CIO 200 to 209
CIO 210 to 219
14 Serial Communications
Polled Unit No. 3
Polling Unit
Local area
(Not used)
(Not used)
(Not used)
(Not used)
(Not used)
(Not used)
(Not used)
CP1L CPU Unit
Example: CJ1M CPU Unit
(Polled Unit No. 1)
(Polled Unit No. 2)
Serial PLC Link Words Serial PLC Link Words
CIO 3100 to 3109
CIO 3100 to 3109
CIO 3110 to 3119 CIO 3110 to 3119
14
14-25