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14 Serial Communications
CP1E CPU Unit Software User’s Manual(W480)
14-5 Serial PLC Links
14
14-5-4 Operating Specifications
Serial PLC Links can be used for both built-in RS-232C ports and serial option ports for N30/40/60 or
NA20 CPU Units. However, two serial ports cannot be used simultaneously for Serial PLC Links.
The following two methods can be used to refresh data.
• Complete link method
• Polling Unit link method
14-5-4 Operating Specifications
Item Specifications
Applicable PLCs CP1E, CP1H, CP1L, CJ1M
Baud rate 38,400 bps, 115,200 bps
Applicable serial ports Built-in RS-232C ports and serial option ports
Both ports cannot be used for Serial PLC Links at the same time. If both
ports are set for Serial PLC Links (either as polling node or polled node), a
PLC Setup setting error (nonfatal error) will occur and the PLC Setup Setting
Error Flag (A402.10) will turn ON.
Connection method RS-422A/485 or RS-232C connection via RS-422A/485 Option Board or
RS232C port.
Words allocated in CIO Area Serial PLC Link Words: CIO 200 to CIO 289 (Up to 10 words can be
allocated for each CPU Unit.)
Maximum number of Units 9 Units max., comprising 1 Polling Unit and 8 Polled Units.
Link methods (data refresh
methods)
Complete link method or Polling Unit link method
Data Refresh Methods
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