Allen-Bradley MicroLogix 1100 Instruction Set Reference Manual page 546

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+ 24V
L1
100-240 VAC
Publication 1763-RM001C-EN-P - October 2009
Proper wiring of a single ended encoder (Typical Allen-Bradley 845TK)
when configuring HSC.MOD for Mode 6 (Quadrature Counter)
The following diagram illustrates connecting an encoder to the
MicroLogix 1100.
The minimum configuration required for Mode 6 operation is to enter a
file number for the PFN parameter, set the AS and CE bits to a (1) and
enter a (6) for the MOD parameter.
DC OUT DC
- COM I/0 I/1 I/2
L2/N NOT VAC O/0
USED VDC
TROUBLESHOOTING
Problem #1:The input display on the MicroLogix LCD screen turn on and
off, but no counts are seen in the HSC accumulator.
Solution:The input filter frequency may need to be adjusted in order to
capture the input pulses.
Follow the steps below.
Note: If the encoder is a High Voltage Differential Line Driver, do
not terminate A, B, or Z.
DC
I/3 COM I/4 I/5 I/6 I/7
VAC O/1 VAC O/2 VAC O/3
VDC VDC VDC
1763-16BWA
IA
I/8 I/9 COM IV1(+) IV2(+)
VAC O/4 VAC O/5 NOT
VDC VDC USED