I/O Refreshing And Communication Service; Cpu Module Operating Modes; Operating Modes - Delta AS Series Operation Manual

11.1.2

I/O Refreshing and Communication Service


Refreshing I/O
The CPU module reads external I/O data periodically or outputs data to an external I/O. Refreshing the
I/O includes the following.

Refreshing data in a digital I/O module

Refreshing data in an analog I/O module

Refreshing data in a network module
All I/O refreshing executes in the same loop. The data in an input device refreshes before a program
executes, and the data in an output device refreshes after the program executes.
Unit
Digital I/O module
Analog I/O module
Network module

Communication service
Communication service is the unscheduled communication service for a network module. It includes the
communication requests sent from external equipment to a CPU module, and the communication requests
sent from the CPU module to the external equipment.

11.2 CPU Module Operating Modes

11.2.1

Operating Modes

There are two operating modes. They can be used to control a user program and all tasks.
STOP mode: A program is not executed under this mode. Users can download a module table, initialize CPU
configuration and other setting, download a program, check a program, and force a bit ON/OFF.
RUN mode: A program is executed under this mode. Users can not download a module table, and initialize
CPU configuration and other setting.
C h a p t e r 11 C P U Mo d u l e O p e r a t i n g P r i n c i p l e
Maximum data exchange
Depends on the number of input/output
channels in the unit.
Depends on the number of input/output
channels in the unit.
Depends on the unit.
Data exchange area
Input relay/Output relay
Data register
Data register
11 - 3
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