Delta AS332P-A User 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, temperature measurement module, loadcell module,
positioning and counter 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 Maximum data exchange Data exchange area
Digital I/O module
Depends on the number of input/output
channels in the unit.
Input relay/Output relay
Analog I/O module,
temperature measurement
module, loadcell module,
positioning and counter
module
Depends on the number of input/output
channels in the unit.
Data register
Network module Depends on the unit. Data register
 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. The communication requests may be received from
time to time but the data or state refreshing on the devices or components will only start afer the END
instruction is scanned and executed if the coummunicaiton is concerning the internal devices or
components of the PLC CPU.
11.1.3 Execution Timing of Interrupts
Interrupts can be categorized into three types, periodic interrupts, timer interrupts, and condition interrupts. The
timing to execute any interrupt is after the current executing instruction is complete and the position and state of
the next to be executed instruction is retained. After the interrupt is executed, the execution of the next
instruction will resume.
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Delta AS332P-A Specifications

General

Brand	Delta
Model	AS332P-A
Category	Control Unit
Language	English