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Chapter 2
Introducing the Absolute Encoder Module
Specifications
2 6
CAUTION: Electrostatic discharge can degrade performance or
damage the module. Handle as stated above.
Module Location
Any 1771 I/O chassis; any 2 slot I.O
group
Number of Inputs
Up to 12 encoder input bits per
module
Encoder Formats
BCD
Natural binary
Standard Gray
Digital Resolution
Up to one part in 4,095 with
natural binary and standard
Gray encoders
Up to one part in 999 with
BCD encoders
High true Logic
From totem pole, open
collector, or differential line
drivers
Can select direction of
rotation of increasing position
for Gray code encoders
Input Voltage Range and Logic State
Logic 1: 1.7V DC
Logic 0:0.0V to 0.6V DC
Input Current per Channel
(sunk by encoder device)
ll mA for single ended drivers
l8 mA for differential drivers
Maximum input Frequency
50 KHz
Encoder Data Settling Time
100 ns
Input Power Supply
+5V DC +0.25V (total output
voltage tolerance includes line
regulation, load regulation, drift,
and ripple)
Current Requirement
300mA (maximum)
Number of Outputs
8
Output Current Rating
2A sourced per output (no
derating with all outputs on)
VA Rating
48W per output
384W per module
Surge Rating
4A for l0 ms
Input and Output Isolation
1500V RMS
Output Power Supply
Selectable : +5 to +24V DC
Backplane Current
800 mA at 5V DC
Output Fuses
3A rectifier fuses (Littelfuse
322003, Buss GBB003, or
equivalent)
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