Delta DVP-ES3 Series

DVP-ES3/EX3/SV3/SX3 Series Hardware and Operation Manual
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12.1 CPU Module Operations
12.1.1 Procedure
The following diagram describes the operation of the CPU module.
The CPU module is supplied with power.
The system enables the initialization.
 The non-latched memory is initialized.
 The downloaded program is checked.
 The parameters in the CPU module are checked.
Diagnosis processing:
 The memory card and other setting are checked.
 The I/O bus is checked.
 The system parameter is checked.
The data sent to the I/O module is refreshed.
 The data sent to the digital I/O module is refreshed.
 The data sent to the analog I/O module is refreshed.
 The data sent to other modules are refreshed.
Program execution:
 The user program is executed, including POU & FB.
 The interrupt subroutine is executed.
The data sent from the I/O module is refreshed.
 The data sent from the digital I/O module is
refreshed.
 The data sent from the analog I/O module is
refreshed.
 The data sent from other modules are refreshed.
Communication service:
 The communication through the CPU module
 The internal communication between the CPU
module and the I/O module