Rockwell-automation 1771-IFE ANALOG INPUT MODULE Manual de usuario descargar pdf (Pagina 57)

7–7Troubleshooting Your Input Module

0 (&!/&+* 4  # -0-3 

Common mode voltage on any input must not exceed +14.25V as

referenced to module common (terminals 20 and 21). Common mode

voltages occur when the ground potentials of current transmitter

and/or voltage device power sources are at differential potentials (as

referenced to module common). The resulting ground currents can

cause voltage potentials at the input terminals.

Observe the following guidelines whenever possible to prevent

common mode voltages:

• use single-ended mode

• use 2-wire transmitters with a common power supply

• separate 2-wire and 4-wire transmitters between different

modules

• tie 4-wire transmitter and/or separate power supply grounds

together

Affect of Common Mode Voltage on Inputs

If common mode voltage exceeds +14.25V on any input, channel to

channel crosstalk can occur. All channel input data in the

programmable controller data table could be invalid. Incorrect

overrange and underrange bits could also occur

/  (# #,+-/ 4 ""-   /  (# &(# 











         

  















         

         

       

   

/  (# #,+-/ 4 ""-   /  (# &(# 











         

  















         

         

         

   

/  (# #,+-/ 4 ""-   /  (# &(# 











         

  















         

         

         

         

   

(+!' /-*.$#- -#" 1&/% !%**#(  &*,0/ 

*" (( !%**#(. !+**#!/#" /+ )+"0(# !+))+*

+-)( (+!' /-*.$#- -#" 1&/% ((

!%**#(. !+**#!/#" /+ )+"0(# !+))+*

(+!' /-*.$#- -#" 1&/% !%**#(  &*,0/ ,,-+2&)/#(3 

*" (( !%**#(. !+**#!/#" /+ !+))+*

Checking for Common

Mode Voltages

1 2 ... 52 53 54 55 56 57 58 59 60 61 62 ... 81 82

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Rockwell-automation 1771-IFE ANALOG INPUT MODULE Manual de usuario Pagina 57

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