I/O Refreshing And Communication Service; Interrupts - Delta AS Series Operation Manual

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11.1.2
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.



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.
Digital I/O module
Analog I/O module,
temperature measurement
module, loadcell module,
positioning and counter
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. 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
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.

I/O Refreshing and Communication Service

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
Unit
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.
Execution Timing of Interrupts
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Maximum data exchange Data exchange area
Input relay/Output relay
Data register
Data register