Spectrum Controls 1771sc-IFE32 User Manual
Page 18
8 PLC-5
TM
32-Channel Analog Input 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.
Place the module in the card guides on the top
and bottom of the slot that guide the 1771sc-IFE32 module in position
To minimize ground-loop
currents on input circuits:
· use differential 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
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
!