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Serial Communications Section 6-3
Specifications
System Configuration
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.
Data Refresh Methods
The following two methods can be used to refresh data.
• Complete link method
• 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.)
Item Specifications
Connection method RS-232C or RS-422A/485 connection via the CPU Unit’s RS-
232C port.
Allocated data area Serial PLC Link Words:
CIO 3100 to CIO 3199 (Up to 10 words can be allocated for
each CPU Unit.)
Number of Units 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
RS-232C
CPU Unit
Polling Unit
CJ1W-CIF11
RS-422A
Converter
CPU Unit
Polled Unit No. 0
CPU Unit
Polled Unit No. 1
PT
Unit No. 2
CPU Unit
Polled Unit No. 3
Number of Polled Units: 8 max.
(See note.)
NS-AL002 when using
an NS-series PT
CPU Unit
Polling Unit
CPU Unit
Polled Unit No. 0
OR
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