Rockwell Automation 1794-ID2 U.MNL INCREMENTAL ENCODER - Manual (Page 14)

1–2 Overview of the Incremental Encoder Module
Publication 1794ĆUM015B-EN-P - May 2001
+
A+
A-
B+
B-
Z+
Z-
G+
G-
Preset Register
Counter Register
LatchRegister
Control Word
Signal Register
Logic
+
A+
A-
B+
B-
Z+
Z-
G+
G-
Preset Register
Counter Register
LatchRegister
Control Word
Signal Register
Logic
Gavanically Isolated
dc/dc Converter
Internal +5V dc
12-24V dc
0V
Serial Bus
Bus Interface
Optocouplers
The incremental encoder module performs high-speed scaling
calculation operations for various industrial applications. The
module interfaces with a FLEX family adapter which then
communicates with a programmable controller processor that has
block-transfer capability and external I/O devices.
The adapter/power supply transfers data to the module (block
transfer write) and from the module (block transfer read) using BTW
and BTR instructions in your ladder diagram program. These
instructions let the adapter read input values and status from the
module, and let you write output values and configure the module’s
mode of operation. The following illustration describes the
communication process.
What the Incremental
Encoder Module Does