DVP-ES3 Series Operation Manual
5-18
5.2.12 Data Registers (D)
The data register stores 16-bit data. The highest bit represents either a positive sign or a negative sign, and the values
that the data registers can store range between -32,768 to +32,767.
Two 16-bit registers can be combined into a 32-bit register; for example, (D+1, D) in which the lower number register
represents the low 16 bits. The highest bit represents either a positive sign or a negative sign, and the values that the data
registers can store range between -2,147,483,648 to +2,147,483,647.
Four 16-bit registers can be combined into a 64-bit register; for example, (D+3, D+2, D+1, D) in which the lower
number register represents the lower 16 bits. The highest bit represents either a positive sign or a negative sign,
and the values that the data registers can store range between -9,223,372,036,854,776 to
+9,223,372,036,854,775,807.
You can also use the data registers to refresh the values in the control registers in the modules other than digital I/O
modules. Refer to the ISPSoft User Manual for more information on refreshing the values in the control registers.
There are two types of registers.
General-purpose registers: When the PLC changes to RUN, or is disconnected, the value in the register is cleared
to zero. If you want to retain the data when the PLC changes to RUN, Refer to the ISPSoft User Manual for more
information. Note that the value is still cleared to zero when the PLC is disconnected.
Latched register: If the PLC is disconnected, the data in the latched register is not cleared. In other words, the value
before the disconnection is retained. If you want to clear the data in the latched area, you can use the RST or ZRST
instructions.
5.2.13 Special Data Registers (SR)
Every special data register has its own definition and specific function. System status and the error messages are stored
in the special data registers. Refer to section 2.2.14 in DVP-ES3 Series Programming Manual for more reference.
5.2.14 Index Register (E)
The Index register is a 16-bit data register. It is similar to the General register in that data can be read from it and written to
it; however, it is mainly used as the index register. The range of index registers is E0–E9. Refer to section 4.4 in DVP-ES3
Series Programming Manual for more reference.
5.2.15 File Registers (FR)
The DVP-ES3 Series PLC provides you with File registers for storing larger numbers of parameters.
You can edit, upload, and download the parameters in the File registers through ISPSoft.
You can read the values in File registers while operating the PLC. Refer to the MEMW instruction (API 2303) in
DVP-ES3 Series Programming Manual for more information about how to write to the File registers.
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