Siemens Simatic S7-300 Instrukcja Obsługi Pobierz pdf (Strona 274)

Principles of analog modules

S7-300 Module data

274 Manual, 02/2013, A5E00105505-08

Resolution < 16 bits

On analog modules with a resolution of < 16 bits, the analog value is stored left-aligned. The

unused least significant bit positions are padded with zeros ("0".)

The example below demonstrates the zero padding of unused bit positions for low resolution

Table 5- 1 Example: Bit pattern of a 16-bit and 13-bit analog value

Resolution Analog value

Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

16-bit analog value 0 1 0 0 0 1 1 0 0 1 1 1 0 0 1 1

13-bit analog value 0 1 0 0 0 1 1 0 0 1 1 1 0 0 0 0

Siemens Simatic S7-300 Instrukcja Obsługi Strona 274