AH Programming Manual 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 *1: The decimal forms are notated by K in the device lists in chapters 5 and 6, whereas they are entered directly in ISPSoft. *2: The floating-point numbers are notated by F/DF in the device lists in chapters 5 and, whereas they are represented by decimal points in ISPSoft. *3: The strings are notated by “$” in chapters 5 and 6, whereas they are represented by “ ” in ISPSoft.
Type Device name Number of devices Range Bit device Input relay X 8192 X0.0~X511.15 Output relay Y 8192 Y0.0~Y511.15 Data register D 16384 (AHCPU500) D0.0~D16383.15 32768 (AHCPU510) D0.0~D32767.15 65536 (AHCPU520/530) D0.0~D65535.15 Link register L 16384 (AHCPU500) L0.0~ L16383.15 32768 (AHCPU510) L0.0~ L32767.15 65536 (AHCPU520/530) L0.0~ L65535.15 Auxiliary relay M 8192 M0~M8191 Special auxiliary relay SM 2048 SM0~SM2047 Stepping relay S 2048 S0~S2047 Timer T 2048 T0~T2047 Counter C 2048 C0~C2047 32-bit counter HC 64 HC0~HC63 Word device Input relay X 512 X0~X511 Output relay Y 512 Y0~Y511 Data register D 16384 (AHCPU500) D0~D16383 32768 (AHCPU510) D0~D32767 65536 (AHCPU520/530) D0~D65535 Special data register SR 2048 SR0~SR2047 Link register L 16384 (AHCPU500) L0~L16383 32768 (AHCPU510) L0~L32767 65536 (AHCPU520/530) L0~L65535 Timer T 2048 T0~T2047 Counter C 2048 C0~C2047 32-bit counter HC 64 (128 words) HC0~HC63 Index register E 32 E0~E31 Constant* Decimal system K 16 bits:
-32768~32767 32 bits: -2147483648~2147483647 Hexadecimal system 16# 16 bits: 16#0~16#FFFF 32 bits: 16#0~16#FFFFFFFF Single-precision floating-point number F 32 bits: ±1.17549435-38~±3.40282347+38 Double-precision floating-point number DF 64 bits: ±2.2250738585072014-308~ ±1.7976931348623157+308 String* String “$” 1~31 characters