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CHAPTER7 COMMUNICATIONS WITH INTELLIGENT
FUNCTION MODULE
(1) Intelligent function module
The intelligent function module allows the CPU module to process analog quantity and high speed pulses that
cannot be processed by the I/O modules.
For example, the analog-digital conversion module, one of the intelligent function modules, uses analog quantity
by converting it into a digital value.
(2) Communication with intelligent function module
The intelligent function module is equipped with a memory (buffer memory) to store the data taken in from or
output to external devices.
The CPU modules writes or reads data to or from the buffer memory of the intelligent function module.
7.1 Communications between CPU Module and Intelligent Function
Module
The following table shows the communication methods between the CPU module and intelligent function modules and
the communication timing.
: Executed, -: Not executed
*1: Indicates the program that uses the intelligent function module device, FROM or TO instruction, or the intelligent function module
dedicated instruction.
*2: The RUN/STOP/RESET switch is set from STOP RUN (RUN LED flashes) STOP RUN.
● Data, such as initial settings used for communications with intelligent function module, are stored in the CPU module.
For the storage location, refer to Section 5.1.
● Power off and then on or reset the CPU module to make the initial setting configured in GX Configurator taken effect.
Table7.1 Communication methods with intelligent function module and the communication timing
Communication methods with intelligent
function module
Communication timing
Reference
Power off
on
CPU
module is
reset
STOP
RUN
*2
Instruction
execution
END
processing
GX Configurator
Initial setting - -
Section 7.1.1
Auto refresh setting - - - -
Initial device value - - Section 7.1.2
FROM or TO instruction
*1
- - - - Section 7.1.3
Intelligent function module device
*1
- - - - Section 7.1.4
Intelligent function module dedicated instruction
*1
- - - - Section 7.1.5