Rockwell-automation 1769-IF4XOF2 Compact 8-Bit Low Resolution Analog I Bedienungsanleitung PDF herunterladen (Seite 33)

Publication 1769-UM008A-EN-P - November 2001

Installation and Wiring 3-11

Outputs

• Voltage outputs (Vout 0+ and Vout 1+) of the module are

referenced to ANLG COM. Load resistance for a voltage output

channel must be equal to or greater than 1K

Ω.

• Current outputs (Iout 0+ and Iout 1+) of the module source

current that returns to ANLG COM. Load resistance for a current

output channel must remain between 0 and 300

Ω.

Effect of Transducer/Sensor and Cable Length Impedance on Voltage Input

Accuracy

For voltage inputs, the length of the cable used between the

transducer/sensor and the module can affect the accuracy of the data

provided by the module.

Where:

Rc = DC resistance of the cable (each conductor) depending on

cable length

Rs = Source impedance of analog transducer/sensor input

Ri = Impedance of the voltage input (150 K

Ω)

Vs = Voltage source (voltage at the transducer/sensor input

device)

Vin = Measured potential at the module input

%Ai = Percent added inaccuracy in a voltage-based system due

to source and cable impedance.

ATTENTION

Be careful when stripping wires. Wire fragments

that fall into a module could cause damage at

power up. Once wiring is complete, ensure the

module is free of all metal fragments.

V in

RcRs

Vin

Ri Vs

×[]

×()

++[]

-------------------------------------------------------

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 103 104

Keine Kommentare

Rockwell-automation 1769-IF4XOF2 Compact 8-Bit Low Resolution Analog I Bedienungsanleitung Seite 33