Basic Overview of ET200 SP HA

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The high-performance I/O system SIMATIC ET 200SP HA – perfectly matched to the requirements of the process industry and with clear advantages wherever ruggedness and maximum availability are important in the process and manufacturing industry. Benefits Availability: Redundancy at the PROFINET interface (S2 or R1) Hot swapping during runtime station expansion possible during runtime Easy to Use: Compact modules with permanent wiring. One terminal block for all 24 V standard signals Tool-free connection system with push-in-terminals Compact Design Compact with up to 56 i/o modules per station High concentration of up to 32 channels on a module that is only 22.5 mm wide System-integrated power bus Seamless integration in SIMATIC PCS new PROFINET IO communication standard Functions Main functions Compact I/O modules Up to 32 channels on a module that is 22.5 mm wide Up to 56 modules per station Perfectly suited for applications in the field Installation up to hazardous zone 2 Extended temp
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What is the meaning of 12/13/15 bit resolution in siemens PLC cards?

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Analog modules in siemens  comes with maximum 15 bit resolution.
                         2^15 = 32768 which means 0.....32767.

PLC converts voltage as below:
Volt  0...10 V         into  Counts: 0.....27648
                                      Counts: 27649.....32511: Over control range
                                      Counts: 32767: Overflow : it will show for voltage in overange .

If the resolution is higher then smaller voltage can be converted to counts.
Eg:
15 bit resolution card :
2^15 = 32768    factor = 32767( total count as above)/32767(card resolution)=1
so voltage minimum readable = 10 (Max Volt) / 27648 ( Counts for 10 Volt)  * 1 (factor) = 0.00036 V

12 bit resolution card :
2^12 = 4096    factor = 32767( total count as above)/4096(card resolution)=8
so voltage minimum readable = 10 (Max Volt) / 27648 ( Counts for 10 Volt)  * 8 (factor) = 0.00289 V

from above if we resolution is decreased than voltage change accuracy with respect to count is alos reduced.


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