Rockwell Automation 1755-OF8 GuardPLC Controller Systems - Manual (Page 95)

95 Publication 1753-UM001C-EN-P - March 2010 95
Chapter
9
Wire the 1753-IF8XOF4 Analog I/O Module
Introduction
The 1753-IF8XOF4 module features 8 safety analog inputs and 4
standard analog outputs.
Safety-related Analog
Inputs These input values are available.
Voltage Measurement
If an open-circuit fault occurs during voltage measurement,
unpredictable input signals are received on the high resistance inputs.
Values resulting from this fluctuating input voltage are not reliable.
Because the module does not feature circuit monitoring, you must
terminate input channels with a 10 k
Ω
resistor when measuring
voltage. Consider the internal resistance of the source as well.
Current Measurement
To measure current, connect a 500
Ω
external shunt in parallel to the
input. Accuracy of the shunt must be included in accuracy calculations
of the input signal. Terminating resistors are not required for current
measurement with the external shunt connected in parallel.
Topic Page
Safety-related Analog Inputs 95
Standard Analog Outputs 97
Input Channels Polarity Current or Voltage Range Safety
Accuracy
8 unipolar 0…+10V 0…2000 2%
0…20 mA / 4…20
mA
0…1000
(1)
0…2000
(2)
(1) With external 250
Ω
shunt.
(2) With external 500 Ω shunt.