ISPSoft User Manual

Appendix B Important Points Related to AH500 Series CPU Modules
Device type Access property Description
E
Word
Index register
The value stored in an index register indicates the offset
for a device modified. (*3)
SM
Bit
Special auxiliary relay
It is used as a state flag for a special function of the
system. (*4)
SR
Word
Special data register
It is used as a data register for a special function of the
system. (*4)
*1. AH500 series CPU modules support the manipulation of the bits in the input relays, the output relays, the data
registers, and the link registers. For example, X0.1 indicates that bit 1 in X0 is manipulated, Y0.1 indicates that bit
1 in Y0 is manipulates, D0.1 indicates that bit 1 in D0 is manipulates, and L0.1 indicates that bit 1 in L0 is
manipulated. Please refer to the following sections for more information.
*2. A link register is used for data exchange, but it can also be used as a general data register.
*3. The index registers that AH500 series CPU modules have are E devices. AH500 series CPU modules do not have
F devices.
*4. AH500 series PLCs are different from DVP series PLCs in that the special auxiliary relays and the special data
registers in AH500 series PLCs are called SM devices and SR devices.
Please refer to AH500 Programming Manual or PLC Instructions and Special Registers
Reference in a project for an AH500 series CPU module in ISPSoft for more information about the
devices in AH500 series CPU modules.
B.1.2 Manipulating the Bits in the X/Y/D/L Devices
The X/Y devices in DVP series PLCs are represented by X0, Y1, and etc. The X/Y devices which
are used as bit devices in AH500 series CPU modules are represented by X0.0, Y0.0, and etc.
Besides, the X/Y devices which are used as word devices in AH500 series CPU modules are
represented by X0, Y0, and etc. X0.0 represents the first bit (the lowest bit) in X0, and X0.15
represents the last bit (the highest bit) in X0.
After the value in D0 is moved to Y1, the states of Y1.0~Y1.15 will change.
The bits in the X/Y devices in AH500 series CPU modules can be manipulated. The bits in the D/L
devices in AH500 series CPU modules can also be manipulated in the same way. Please refer to
the following example. The state of M0 is sent to D0.2. Suppose the initial value in D0 is 0. When M0
is ON, the value in D0 becomes 4.
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