Technical Guide for PLC Basic - Omron
Technical Guide for PLC Basic CSM_PLC Basic_TG_E_1_1. Introduction This Guide will describe the terminology needed for Basic operation of the SYSMAC PLC (Programmable Controller), for clients new to our PLCs. This Guide does not cover Technical details regarding the setting of the FA System or PLC programming after purchase. I/O Refresh With the PLC (Programmable Controller), commands from user programs designed by the client are executed one by one and processed by reading and writing information in the internal PLC memory area (At Omron , we call this the "I/O Memory"). At the same time, packages of data from sensors/switches that are directly connected to the Basic I/O unit are exchanged with data in the PLC. internal I/O Memory, at specific times. This process to totally exchange external data and internal I/O memory data is called "I/O Refresh Operation".
(Self-Diagnosis) Re ad/Write Package Exch nge Execute Program I/O Memory Change (after all commands executed) Peripheral Servicing PLC Processing Cycle PLC Inside PLC (CPU Unit) Basic I/O Unit or built-in I/O Refresh with external devices External Data (Sensor, Switch, Actuator etc.) I/O Refresh 00111010 11011000 10101001 00000000 00000000 ...
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