Omron CP1H-CPU - 05-2006, Руководство по эксплуатации

Страница: 373 / 669

342
Serial Communications
Section 6-1
• Polling Unit link method
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 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.
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)
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
CP1H CPU Unit
(Polling Unit)
Serial PLC Link Words
(CIO Area)
CP1H CPU Unit
(Polled Unit No. 0)
Serial PLC Link Words
(CIO Area)
CP1H CPU Unit
(Polled Unit No. 1)
Serial PLC Link Words
(CIO Area)
CJ1M CPU Unit
(Polled Unit No. 2)