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MELSEC-Q
3 SPECIFICATIONS
(2) Communicating with intelligent function modules
The remote master station can communicate with the intelligent function module
mounted to the remote I/O station in the following four ways.
Methods for communicating with the intelligent module Features
(a)
By cyclic transmission (common parameters) +
intelligent function module parameters
(Automatic refresh target device W).
When the intelligent function module is mounted to a
nearby slot of the CPU module, the same kind of
sequence program can be created.
Regular time data can be read without regard to timing
(b)
Dedicated instructions for the intelligent function module
(REMFR,REMTO)
GX Configurator is not needed.
Data can be communicated only when needed.
(c)
By cyclic transmission (common parameters) +
intelligent function module parameters
(Automatic refresh target device D).
Remote I/O station parameters (parameters for
transmitting between devices)
When the intelligent function module is mounted to a
nearby slot of the CPU module, the same kind of
sequence program can be created.
In a way different from the method 1, it is also possible to
set the intelligent function module parameters in the
same way as the setting for the host.
(d)
Link dedicated instructions (READ,WRITE)
Intelligent function module parameters
(Automatic refresh target device D)
When the intelligent function module is mounted to a
nearby slot of the CPU module, the same kind of
sequence program can be created.
Data can be communicated only when needed.
In communication methods (a), (c) and (d), when there is communicating
between remote master station and remote I/O station, the network parameters
are written to the remote master station and the PC parameters and intelligent
function module parameters are written to the remote I/O station.
The device range for communicating with each remote I/O station is set by the
remote master station common parameters.
PC parameters written to the remote I/O station will not cause problems with the
intelligent function module communication, even with the default settings.
Change the settings of the PLC parameters as needed.
POINT
(1) Note that the number of intelligent function module parameters (initial setting,
automatic refresh setting) that may be set is limited. If the number of
parameters set exceeds the limited number, the remote I/O module detects
the "SP. PARA ERROR (3301)" error. To auto refresh the excessive items,
use the REMFR/REMTO instruction to read/write data from/to the intelligent
function module.
Item No. of the parameters that can be set
Initial setting Up to 512
Auto refresh setting Up to 256
The number of parameters for initial setting is preset to each intelligent
function module. To confirm the numbers of parameters for initial setting,
refer to the user's manuals of the corresponding intelligent function modules.
Refer to Section 5.2.1(4) for the way to count the number of parameters for
automatic refresh setting.
(2) A remote master station cannot execute the dedicated instructions for
intelligent function module to the intelligent function modules mounted in a
remote I/O station.