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Chapter 7 Communication function
7.4 Other company's dedicated mode Ver.2.0
7.4.1 Introduction
Other company's dedicated mode enables user to communicate with other company's devices by having the most
useful protocol as selected among communication protocols used in industrial devices built in GLOFA PLC Cnet I/F
module without preparing additional communication program, which is added in Ver.2.0. Asynchronous Link Full
Duplex Protocol for serial communication made by AB(ALLEN-BRADLEY) and MODBUS ASCII/RTU Protocol made
by MODICON PLC among other company's protocols are supported in Cnet Ver.2.0. Other company's dedicated
communication driver supports only server function without master operation available. [Figure 7.20] shows an
example of system configuration for communication in other company's dedicated mode. Cnet I/F module operates
as a server and executes response function to data request from higher PC or DCS when in AB or MODBUS's
dedicated mode communication as shown in the figure.
[Figure 7.20] Example of communication system in other company's dedicated mode
AB asynchronous link
MODBUS /ASCII.RTU
RS-232C cable
Modem
Other company's dedicated mode has the following features.
AB Asynchronous Link Full Duplex protocol supported.
MODBUS ASCII/RTU protocol supported.
Other company's communication driver can be used as downloaded in Frame Editor.
Other company's dedicated mode can be set in On-line mode,.
Operation available for RS-232C/RS-422 in stand-alone or interlocking mode.
Operation available always as a server, however, unavailable as a master.
PLC programming is unnecessary.
Extension available for protocols which will be added in future.
Access available to %M area of direct variable area in PLC.
Cnet(Other company's dedicated mode)
Dedicated modem
7-109
RS-232C cable
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