Manual

Chapter 6
Publication 1771-6.5.126 – March 1998
Module Specifications
This chapter gives 1771-QI module specifications including:
• I/O specifications
• environmental conditions
• hardware requirements
• process control options
The following table lists the I/O specifications.
Inputs 4 analog (4-20 mA, 1 to +5V dc, 0 to +10V dc selectable)
Outputs 4 analog (4-20 mA, 0 to +10V dc, –10 to +10V dc selectable)
I/O Resolution 12-bit binary
I/O Isolation 1500V rms between chassis and swingarm terminals, and
between input and output terminals
I/O Accuracy
(linearity, gain, and offset)
0.1% full scale @ 25
o
C, and +/–50ppm/
o
C of full scale range
Input Impedance Voltage Input: 50K ohms, differential mode
25K ohms, common mode
Current Input: 250 ohms
Loss of Input Detection Detects loss of position, pressure, and RPM input sensors:
out of range 4-20 mA sensors
out of range 1-5V dc sensors
out of range 0-10V dc sensors
Output Loading Voltage: 5 mA max for any range
Current: 15V dc compliance
(supports a max current-loop impedance of 750
ohms)
Output Overload
Protection
Protects against short circuit for one minute, maximum
The following table lists environmental conditions.
Operational Temperature 0 to 85
o
C (32 to 140
o
F)
Thermal Dissipation 21 BTU/hr (outputs full ON)
Storage Temperature –40 to +85
o
C (–40 to +140
o
F)
Relative Humidity 5 to 95% (without condensation)
The following table lists the hardware requirements.
Compatible I/O Chassis Allen-Bradley Series B
Slot Size Any single I/O slot in 1771-I/O chassis
Power Requirements (Backplane) 1.2 amps at 5V dc
Swingarm Style 1771-WF
Keying Bands Between: 20-22
and 26-28
I/O Specifications
Environmental Conditions
Hardware Requirements