2 Functions of Devices in DVP-PLC ES/EX/SS and SA/SX/SC series MPU (double frequency) X10 X11 A-phase X0 B-phase X1 PV in C251 0 1 2 3 4 5 6 0 1 2 3 4 5 3 Counting up Counting down Contact Y0, C251 EH2/SV/EH3/SV2 series MPU (double frequency) X10 X11 A-phase X0 PV in C251 0 1 2 3 4 5 6 0 1 2 3 4 5 2 Counting up Counting down Contact Y0, C251 2.8 Numbering and Functions of Registers [D], [E], [F] 2.8.1 Data register [D] A data register is for storing a 16-bit datum of values between -32,768 to +32,767. The highest bit is “+” or “-" sign. Two 16-bit registers can be combined into a 32-bit register (D + 1; D of smaller No. is for lower 16 bits).
The highest b it is “+” or “-” sign and it can store a 32-bit datum of values between -2,147,483,648 to +2,147,483,647. ES/EX/SS series MPU: DVP-PLC Application Manual 2-31 se X1 General purpose D0 ~ D407, 408 points Total 744 points Latched D408 ~ D599, 192 points. Fixed to be latched. Data register D Special purpose D1000 ~ D1143, 144 points. Some are latched. Index register E, F E, F, 2 points