CompactLogix Packaged Controllers 19
Publication 1769-IN082A-EN-P - July 2008
Analog I/O Wiring Diagrams
Read and consider this information before wiring your analog I/O.
• All analog I/O commons (ANLG COM) are connected in the analog I/O card
of the packaged controller. The analog common (ANLG COM) is not
connected to earth ground inside the packaged controller.
• Analog I/O channels are not isolated from each other.
• Use Belden 8761 (or equivalent) shielded wire.
• Under normal conditions, the drain wire and shield junction must be
connected to earth ground via a panel or DIN rail mounting screw at the
analog I/O removable terminal block end. Keep the shield connection to
ground as short as possible.
• To ensure optimum accuracy, limit overall cable impedance by keeping your
cable as short as possible. Plan to place the packaged controller as close to
your sensors or actuators as your application permits.
(1)
• If multiple power supplies are used with analog inputs:
– the power supply commons must be connected.
– do not exceed the specified isolation voltage.
• The embedded analog I/O does not provide loop power for analog inputs.
Use a power supply that matches the input transmitter specifications.
• Differential analog inputs are more immune to noise than single-ended
analog inputs.
• Voltage outputs (Vout 0+ and Vout 1+) of the analog I/O are referenced to
ANLG COM. Load resistance for a voltage output channel must be equal to
or greater than 1 KΩ.
• Current outputs (Iout 0+ and Iout 1+) of the analog I/O source current that
returns to ANLG COM. Load resistance for a current output channel must
remain between 0…300 Ω.
• Voltages on Vin+, V/Iin-, and Iin+ of the analog I/O must be within 0 to
+10V DC of analog common.
ATTENTION
Analog outputs may fluctuate for less than a second when power is applied or removed.
This characteristic is common to most analog outputs. While the majority of loads will
not recognize the short signal, take preventive measures to ensure that connected
equipment is not affected.
IMPORTANT
In environments where high-frequency noise may be present, it may be necessary to
directly ground cable shields to earth at the removable terminal block end and via a 0.1µF
capacitor at the sensor end.
(1)
Cable length over 50 m (164.04 ft) may impact accuracy. For details, refer to the Compact Combination Analog I/O Module,
publication 1769-UM008
.
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