Rockwell-automation 1794-APBDPV1 FLEX I/O PROFIBUS Adapter User Manual Manual do Utilizador descarregar pdf (Página 111)

Publication 1794-UM064B-EN-P - May 2014

Apply FLEX I/O Modules 99

Once Rtotal is known, you must determine the actual cable resistance that can be

accommodated. This is the difference between Rtotal and the module internal

source and sense resistances: Rcable=440-273-10=157 Ω.

Rcable is used to determine the wiring length allowed between the module and

the transmitter:

Note, the 2 in the denominator of the equation is necessary to account for the

resistance of both cable conductors (signal source + and signal and return).

Chapter Summary

In this chapter you learned how to apply the FLEX I/O analog modules.

Cable_length =

157

2*0.1

= 785 m

1 2 ... 106 107 108 109 110 111 112 113 114 115 116 ... 152 153

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Rockwell-automation 1794-APBDPV1 FLEX I/O PROFIBUS Adapter User Manual Manual do Utilizador Página 111