NAiS FP1, Hardware Manual

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4-1. Operating Principles of the Programmable Controller
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Functions of the Four Sections
1 1
CPU (Central Processing Unit)
Controls the operation of the programmable controller including the I/Os according to the program
2 2
Memory
Memory areas where the program and information needed for operation of the programmable controller are
stored.
Types of Memory
2 2
-a: Memory for operands
The memory area for storing operand data (external input relays, timer/counter set value, and data
registers, etc.). Data for the program to handle and the data from and to field devices are centralized in this
area.
Refer to page 93, for details about operands.
2 2
-b: System register
The memory area for storing the system settings of programmable controllers. Information in this area
decides the operand characteristics, advanced control function availabilities, and so on. The system
registers can be set using an FP Programmer II or personal computer using NPST-GR Software.
2 2
-c: Memory for program
The memory area to store the program for execution. Programs are written using an FP Programmer II or
personal computer using NPST-GR Software.
3 3
Input interface
Interface that receives data from the field device and transfers it to the memory for operands.
4 4
Output interface
Interface that outputs data from the memory for operands to the field devices.
4-1. Operating Principles of the Programmable Controller