Omron SYSMAC CS/CJ Series Programming Manual page 292

Serial Communications
Specifications
System Configuration
Data Refresh Methods
Complete Link Method
Item
Connection method
Allocated data area
Number of Units
CPU Unit
Polling Unit
CJ1W-CIF11
RS-422A
Converter
CPU Unit CPU Unit
Polled Unit No. 0 Polled Unit No. 1
Number of Polled Units: 8 max.
(See note.)
Note Up to 8 Units, including the PT and Polled Units, can be connected to the Poll-
ing Unit when a PT set for Serial PLC Link communications is on the same
network.
The following two methods can be used to refresh data.
• Complete link method
• Polling Unit 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.)
Specifications
RS-232C or RS-422A/485 connection via the CPU Unit's RS-
232C port.
Serial PLC Link Words:
CIO 3100 to CIO 3199 (Up to 10 words can be allocated for
each CPU Unit.)
9 Units max., comprising 1 Polling Unit and 8 Polled Units (A
PT can be placed on the same network in an NT Link (1:N),
but it must be counted as one of the 8 Polled Units.)
RS-422/485
CPU Unit
PT
Unit No. 2
Polled Unit No. 3
NS-AL002 when using
an NS-series PT
Section 6-3
CPU Unit
Polling Unit
RS-232C
CPU Unit
OR
Polled Unit No. 0
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