Section 1 Overview 1-3 Basic Configuration and Functions
NS-Designer Operation Manual
1-3-3 PT Memory
PT memory is made up of internal memory and system memory.
Internal Memory
The internal memory contained in the PT can be read and written by the user. Internal memory can be
allocated as required for settings, such as the communications addresses of functional objects.
The internal memory is divided into two sections.
Memory Contents
$B Bit Memory
Bit memory is used for I/O flags and signal information.
Up to 32 Kbits (32,768 bits) can be used.
$W Word Memory
Word memory is used to store numeral and character string data.
Each word contains 16 bits, but consecutive words can be used as required for
character strings and 32-bit data.
Up to 32 Kwords (32,768 words) can be used.
$HB Holding Bit Memory
Holding bit memory is used for I/O flags and signal information.
Up to 8 Kbits (8,192 bits) of data can be held in this area even if the PT power is
turned OFF.
$HW Holding Word Memory
Holding word memory is used to save numerical values and character-string data.
Each word consists of 16 bits, but consecutive words can be used as required for
character strings with a user-defined length and 32-bit data.
Up to 8 Kwords (8,192 words) of data can be held in this area even if the PT power
is turned OFF.
System Memory
System memory is used to change information between the host and the PT, such as controlling the
PT and notifying the host of PT status.
The system memory is divided into two sections.
Memory Contents
$SB System Bit Memory
The system bit memory contains 52 bits with predefined functions.
$SW System Word Memory
The system word memory contains 38 words with predefined functions.
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