Operating Specifications; System Configuration - Omron CJ2 CPU UNIT SOFTWARE User Manual

Serial PLC Links (CJ2M CPU Units Only)
Serial PLC Links are supported only by CJ2M CPU Unit. Serial PLC Links enable exchanging data
between CJ2M CPU Units or between CJ2M CPU Units and CJ1M/CP1H/CP1L/CP1E CPU Units with-
out special programming. The Serial PLC Link Area (CIO 3100 to CIO 3199) is used. Connect the CPU
Units using RS-232C or RS-422A/485. The CJ1W-CIF11 RS-422A Converter is used to convert the
RS-232C serial port on the CJ2M-CPU1@ to RS-422A/485.
PTs set to the 1:N NT Link protocol can be included in the network. PTs set as Polled Units will use the
network to communicate with the CPU Unit set as the Polling Unit via the 1:N NT Link protocol. When
connecting to PTs, however, the contents of the words in the Serial PLC Link Area for the PTs will not
be stable.

Operating Specifications

Parameter
Applicable PLCs
Baud rate
Applicable serial ports
Connection method
Allocated words
Maximum number of Units
Link method (data refresh
method)

System Configuration

Connecting CJ2M, CP1L, CP1H, CP1E, or CJ1M CPU Units 1:N (8 Nodes Maximum)
CPU Unit
Polling Unit
CP1W-CIF11/CIF12 Serial
Option Board or
CJ1W-CIF11 RS-422A
Conversion Adapter
CPU Unit
Polled Unit 0
Note: If PTs are set to the Serial PLC Link protocol on the
same line, the maximum of 8 Unit must include the
polled PTs and CPU Units.
CJ2 CPU Unit Software User's Manual
11 Programming Devices and Communications
CJ2M, CJ1M, CP1H, CP1L, and CP1E
115,200 or 38,400 bps
Serial port on the CPU Unit (A Serial Option Board is required for the CJ2M-
CPU3@.)
RS-232C or RS-422A/485
Serial PLC Link Area Words: CIO 3100 to CIO 3199 (Up to 10 words can be allo-
cated for each CPU Unit.)
Note: CIO 200 to CIO 289 are allocated in CP1E CPU Units for Serial PLC Links.
9 Units max., including 1 Polling Unit and 8 Polled Units.
If PT are set to the 1:N NT Link protocol on the same line, the maximum of 9 Unit
must include the polled PTs and CPU Units.
Complete link method or Polling Unit link method
RS-422A/485
CPU Unit PT
Polled Unit 1 Unit 2
8 Polled Units max.
(See note.)
Setting
CPU Unit
Polled Unit 3
NS-AL002 for an
NS-series PT
11
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