AH500 Hardware and Operation Manual
5-2
5.1 Introduction of Devices
This section gives an account of values/strings processed by the PLC. It also describes the functions of
devices which include input/output/auxiliary relays, timers, counters, and data registers.
5.1.1 Devise Table
5.1.1.1 AH500 basic series CPU Modules (AHCPU500/510/520/530)
Bit device
Input relay X
Output relay Y
Data register D
Link register L
Word
device
Data register D
16384 (AHCPU500) D0~D16383
Link register L
Index register E 32 E0~E31
Constant*
Decimal system K
16 bits: -32768~32767
32 bits: -2147483648~2147483647
Hexadecimal system 16#
16 bits: 16#0~16#FFFF
32 bits: 16#0~16#FFFFFFFF
Single-precision
floating-point number
F 32 bits: ±1.17549435
-38
~±3.40282347
+ 38
Double-precision
DF
64 bits: ±2.2250738585072014
-308
~
+ 308
*1: The decimal forms are notated by K in the device lists in Chapter 5 and Chapter 6 in AH500 Programming
Manual, whereas K50 should be inputted in ISPSoft rather than merely 50.
*2: The floating-point numbers are notated by F/DF in the device lists in Chapter 5 and Chapter 6 in AH500
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