Functional Description - WAGO I/OSYSTEM 750 Series Manual

18 • 750-637 [Inc.Enc./RS422/32Bit/Diff.]

Functional Description

2.1.2.7 Functional Description
Typically, incremental encoders supply two output signals of the encoder
track, both 90° offset. These signals are designated A and B. To improve the
common mode interference suppression, both signals are transmitted as
differential signals. In additional to the A signal, also the inverted /A level is
transmitted. The difference of the input signals is evaluated in the incremental
encoder I/O module. The phase position changes from A to B by changing A
and /A. In this manner, it is possible to pre-define the desired counting
direction by wiring.
Usually, incremental encoders have an index track in addition to the two track
signals. This index track only produces one pulse per one full encoder
revolution. This pulse and the counter reading can be used to determine the
absolute encoder position during rotation. The index pulse has a duration of a
track position pulse. We recommend to always have the latch process
performed in the same rotational direction.
Input
A, /A, B, /B
C, /C
LATCH
GATE
REF
Screen (Shield)
Ue (+5V)
U
+24V
0V
Output
N1, N2
Function
Quadrature input, RS 422
Increment pulse signal channel A or B of the Incremental Encoder
Zero reference input, RS 422
Incremental encoder index pulse
Dependent on the operating mode, the counter reading is taken over
into the latch register or the counter showing the set value is
additionally loaded, if the input edge is positive.
LATCH input 24 V
Dependent on the operating mode, the counter reading is taken into the
latch register or the counter showing the set value is additionally
loaded, if the input edge is positive.
GATE input, 24 V
The counting process is locked if 24 V is applied to input GATE.
REF input, 24 V
During a reference run, the index pulse is only evaluated in conjunction
with an additional sensor signal (Ref).
Connection for the encoder line screen
The screen connection is directly routed to the carrier rail.
5 V supply output for the sensor
(0V) Ground for the sensor signal and supply, internally connected with 0 V
0
24 V supply voltage for the module
Ground for the 24 V supply voltage,
internally connected with U
Function
Cam output, 24 V, 0.5 A
"1" - Counter value is within of the defined range
"0" - Counter value is outside of the defined range
0.
WAGO-I/O-SYSTEM 750
I/O Modules