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7.3 Communication with Intelligent Function Module
7.3.1 Communication methods with intelligent function modules
The following table shows the communication methods between a QCPU and an
intelligent function module.
Table 7.2 Communication method with intelligent function modules
Communication
method
Function Setting
method
Initial setting,
Auto refresh
setting
Performs initial settings and auto refresh settings of intelligent function modules.
These settings allow writing/reading data to/from intelligent function modules regardless
of communication program creation or buffer memory address.
Ex.) When A/D converter module Q64AD is used
•
Initial setting
: •
A/D conversion enable/disable setting
•
Sampling/averaging processing specification,
•
Time average/number of times average specification,
•
Average time/average number of times specification
(Set data in auto refresh settings is stored to the
intelligent function module parameter on a QCPU.)
•
Auto refresh setting
: Set a device on a QCPU to store the following data to.
•
Digital output from Q64AD
•
Maximum and minimum values of Q64AD
•
Error code
(Set data in auto refresh settings is stored to the
intelligent function module parameter on a QCPU.)
Use GX Works2.
Device initial
value
Writes set data in device initial settings of intelligent function modules to the intelligent
function modules at the following timings.
•
At power-on of a QCPU
•
At reset
•
At switching from STOP to RUN
Use GX Works2 to
specify the range
for intelligent
function module
devices (U \G ).
FROM/TO
instruction
Read or write data from or to the buffer memory on an intelligent function module.
Use this instruction
in a sequence
program.
Intelligent
function module
device (U \G )
Directly handles the buffer memory on an intelligent function module as a device of a
QCPU.
Unlike "FROM/TO instruction", this requires only one instruction for processing data that
is read from an intelligent function module.
Specify this device
as a device in a
sequence
program.
Intelligent
function module
dedicated
instruction
Used to simplify programming for using the functions of intelligent function modules.
Use this instruction
in a sequence
program.