AH500 Programming Manual
2-2
2.1 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.
2.1.1 Devise List
2.1.1.1 AH500 Basic CPU Modules (AHCPU500/510/520/530)
Bit
device
Input relay X
Output relay Y
Data register D
Link register L
Word
device
Input relay X
Output relay Y
Data register D
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
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