Rockwell-automation 1771-IFE/C INSTL.INSTRUCTIONS ANALOG INPU Manual de usuario descargar pdf (Pagina 6)

Analog Input Module6

Publication

17715.45 - July 1997

Connect your I/O devices to the cat. no. 1771-WG wiring arm

shipped with the module.

ATTENTION: Remove power from the 1771 I/O

chassis backplane and field wiring arm before

removing or installing an I/O module.

• Failure to remove power from the backplane or

wiring arm could cause module damage, degradation

of performance, or injury.

• Failure to remove power from the backplane could

cause injury or equipment damage due to possible

unexpected operation.

Input connections for the 1771-IFE module with:

• single-ended inputs are shown on page 7

• differential inputs are shown on page 8

Minimizing Ground Loops

To minimize ground-loop currents on input circuits:

• use single-ended mode whenever possible

• 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

Important: We do not recommend mixing 2-wire and 4-wire

transmitter inputs on the same module. Power supply

placement can make it impossible to eliminate ground

loops.

Cable Lengths

Recommended maximum cable length for voltage-mode input

devices is 50 feet. This recommendation is based on considerations

of signal degradation and electrical noise immunity in typical

industrial environments. Cable length for current-mode input

devices need not be as restrictive because analog signals from these

devices are less sensitive to electrical noise interference.

Connect Wiring to the

Field Wiring Arm

1 2 3 4 5 6 7 8 9 10 11 ... 15 16

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Rockwell-automation 1771-IFE/C INSTL.INSTRUCTIONS ANALOG INPU Manual de usuario Pagina 6