Siemens S7-300 - Page 189

Analog modules
9.2 SM 336; AI 6 x 13 Bit
Fail-safe signal modules
Installation and Operating Manual, 01/2010, A5E00085586-10
189
Improving current measuring precision at channels 0 through 3 of the analog input module
It is advisable to interconnect unused voltage inputs with the corresponding current input
when using channels 0 to 3 of SM 336; AI 6 x 13Bit for current measurements. See the
figure below. This measure improves precision by approx. 0.2%.
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0
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9
6
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0
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09
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Figure 9-7 Improving current measuring precision at channels 0 through 3 using 2 DMU
9


0
09
0,
0
/
0
'08
3
6
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$1$
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Figure 9-8 Improving current measuring precision at channels 0 through 3 using 4 DMU