Chapter 2 Devices
2-51
1. ×10.0 drives S621 to determine whether the counter HC0 is the addition counter or the
subtraction counter.
2. When ×11.0 is switched from OFF to ON, the instruction RST is executed, the current value of
the counter HC0 is cleared to zero, and the contact is switched OFF.
3. When ×12.0 is switched from OFF to ON, the current value of the counter increases or
decreases by one.
4. When the current value of the counter HC0 changes from -6 to -5, the contact of HC0 is
switched from OFF to ON. When the current value of the counter HC0 changes from -5 to -6,
the contact of HC0 is switched from ON to OFF.
5. If users use the instruction MOV or ISPSoft to transmit a value bigger than the setting value to
the current value register HC0, the contact of the counter HC0 will be ON and the current value
will become the same as the setting value next time ×12.0 is switched from OFF to ON.
2.2.13 Data Registers
The data register stores the 16-bit data. The highest bit represents either a positive sign or a
negative sign, and the values which can be stored in the data registers range from -32,768 to
+32,767. Two 16-bit registers can be combined into a 32-bit register, i.e. (D+1, D) in which the
register whose number is smaller represents the low 16 bits. The highest bit represents either a
positive sign or a negative sign, and the values which can be stored in the data registers range from
-2,147,483,648 to +2,147,483,647. Besides, four 16-bit registers can be combined into a 64-bit
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