Rockwell Automation 1771-SF1 SERVO INT MOD - Manual (Page 8)

Component Interfacing, Module
Preparation, and Installation
Chapter 2
2Ć4
The common terminal of the servo interface module should not be used
for the shield connection. This terminal is a common with respect to the
analog output, TTL outputs and pull-up resistors on the differential inputs.
WARNING: Do not use the common terminal of the servo
interface module field wiring arm for the shield connection.
Unpredictable operation could occur with resulting damage to
equipment and/or injury to personnel.
Prior to installation, the multiplication factor for counting the encoder
quadrature pulses must be set internally. The quadrature pulses are
transmitted through the differential line drivers to the terminals of
Channels A and B. An additional complementary set of equal but
logically opposite pulses are transmitted by the drivers to the terminals of
Channel A and Channel B. The servo interface module can be set to
count either 1, 2, or 4 of the quadrature pulse edges for each quadrature
set depending on the desired positioning precision (Figure 2.2). The
desired multiplier, x1, x2, or x4 can be set manually by inserting the pair
of Burg pin jumpers on selected pairs of terminals. The jumpers are
located on the printed circuit board inside the module. They are
accessible by removing the cover plates according to the following
procedure:
Remove the four slotted screws from the label-side of the module.
Remove the left and right cover plates.
Place the printed circuit board on a table, solder side down.
The pair of Burg pin jumpers are located in the center of the
component-side of the printed circuit board and are identified by the
labels JPR1 and JPR2.
Position the jumpers according to Figure 2.3.
Module Preparation