Omron CJ1M-CPU series Programming Manual

272
Serial Communications Section 6-3
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 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 address allocated for
the local Polled Unit data is 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.
Example: Polling Unit link method, highest unit number: 3.
In the following diagram, Polled Unit No. 2 is a PT or a Unit not participating in
the network, so the corresponding area in the Polling Unit is undefined.
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)
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 Local area Local area
Polled Unit
No.1
(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.)
(Not used.)
(Not used.)
(Not used.)
(Not used.)
(Not used.)
Undefined
Polled Unit
No.3
(Not used.)
(Not used.)
(Not used.)
(Not used.)

Omron CJ1M-CPU series Specifications

General

Brand	Omron
Model	CJ1M-CPU series
Category	Controller
Language	English