Allen-Bradley FLEX I/O 1794-ID2, User Manual, Page: 34 / 84

2–14 How to Install Your Incremental Encoder Module
Publication 1794-6.5.15 – December 1998
The incremental encoder module has one status indicator (PWR) that
is on when power is applied to the module, and one input status
indicator for each input (12 in all).
A B C
2 CH INCREMENTAL ENCODER MODULE
1794–ID2
A B Z G + – A B Z G + –
Allen-Bradley
1
A = Power/status indicator – indicates power applied to module and
status of module.
B = Insertable label for writing individual I/O assignments.
C = Status Indicators –
A = Status of input A
B = Status of input B
Z = Status of input Z
G = Status of input G
+ = Positive count detected
– = Negative count detected
Indicator Indication Explanation
A Yellow Input A active
Off Input A not active
B Yellow Input B active
Off Input B not active
Z Yellow Input Z active
Off Input Z not active
G Yellow Input G active
Off Input G not active
+ Yellow On when a positive pulse is detected; turns off
on negative pulse.
– Yellow On when a negative pulse is detected; turns off
on positive pulse.
OK Red Red during initialization after power turned on
Green Green when initialization is completed
In this chapter, we told you how to install your incremental encoder
module in an existing programmable controller system and how to
wire to the terminal base units.
Module Indicators
Chapter Summary