14 Serial Communications
14-32
CP2E CPU Unit Software User’s Manual(W614)
z 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.
Example for Ten Link Words (Maximum Number of Words)
The CPU Unit that is the Polling Unit (either CP2E, CP1E, CP1H, CP1L, or CJ2M) 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 CP2E, CP1E, CP1H, CP1L, or CJ2M) send their data (CIO 210 to CIO 219)
to consecutive sets of 10 words (CIO 210 to CIO 289) in the Polling Unit.
Polling Unit
Local area
Polled Unit No. 0
(Not used)
(Not used)
(Not used)
(Not used)
(Not used)
(Not used)
(Not used)
Polling Unit
Local area
Polled Unit No. 0
Polled Unit No. 1
Polled Unit No. 3
Undefined
(Not used)
(Not used)
(Not used)
(Not used)
Polling Unit
Local area
Polled Unit No. 1
(Not used)
(Not used)
(Not used)
(Not used)
(Not used)
(Not used)
(Not used)
Polling Unit
Local area
Polled Unit No. 3
(Not used)
(Not used)
(Not used)
(Not used)
(Not used)
(Not used)
(Not used)
No.0
No.1
No.2
No.3
No.4
No.5
No.6
No.7
CP2E CPU Unit
(Polling Unit)
Serial PLC Link WordsSerial PLC Link WordsSerial PLC Link WordsSerial PLC Link Words
CP2E CPU Unit
(Polled Unit No. 0)
CP1L CPU Unit
(Polled Unit No. 1)
Example: CJ2M CPU Unit
(Polled Unit No. 2)
CIO 200 to 209
CIO 210 to 219
CIO 200 to 209
CIO 210 to 219
CIO 3100 to 3109
CIO 3110 to 3119
CIO 3100 to 3109
CIO 3110 to 3119
CIO 220 to 229
CIO 230 to 239
CIO 240 to 249
CIO 250 to 259
CIO 260 to 269
CIO 270 to 279
CIO 280 to 289
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