Omron CJ - 09-2009 Operation Manual page 54

CJ-series Features
Port-specific Protocol Macros
Create Protocol Macros
for All Ports
Standard Serial Communications with External Devices
Multilevel Network Configurations
6
Protocol macros can be used to create versatile communications functions for
any of the PLC's communications ports. The communications functions can
have host link, NT Link, or protocol macro configurations and can be directed
to RS-232C and RS-422/485 ports on any of the Units.
All together, a CPU Unit can support a maximum of 32 ports.
Host Computer Programming Device
Messages can be transferred to and from standard serial devices with the pro-
tocol macro function (according to preset parameter settings). The protocol
macro function supports processing options such as retries, timeout monitor-
ing, and error checks.
Symbols that read and write data to the CPU Unit can be included in the com-
munications frames, so data can be exchanged with the CPU Unit very easily.
OMRON components (such as Temperature Controllers, ID System Devices,
Bar Code Readers, and Modems) can be connected to a Serial Communica-
tions Unit with the standard system protocol. It is also possible to change the
settings if necessary.
Note The Serial Communications Unit must be purchased separately to take
advantage of this function.
Different network levels can be connected as shown in the following diagram.
The multilevel configuration provides more flexibility in networking from the
manufacturing site to production management.
OA network:
FA network:
Open network:
CPU Unit
Up to 32 ports are possible
Transmit or receive data with just one instruction.
External device
Ethernet
Controller Link
DeviceNet
Section 1-2
PT
Serial Communications
Unit
External device
with serial port