System description - Pilz GmbH & Co.

Modules
Counter modules (standard)
PSSu E S INC(-T)
3.9
Function description
][Funktionsbeschreibung Supply
Module supply
The module supply provides the
module with voltage.
][Funktionsbeschreibung_Ein ST-INC
The module has two operating modes:
Incremental encoder (default)
Counter
In incremental encoder mode the
module evaluates inputs A and B. In
counter mode, only the rising edges at
input A are counted. The user can define
the operating modes and any additional
options using the system
software
In both operating modes, the counter
status and the status of the latch
memory are each transmitted to the
head module via the module bus with
a 32 bit data word. The module sends
additional status information.
The module has three dual-pole, differential
inputs (A, B, C) and three single-pole
inputs referenced to earth (G,
L, S). Signals with +/- 5 V are connected
to the dual-pole inputs in accordance
with RS 422.
The single-pole inputs are used for
special functions. Inputs G and L may
be connected to external signal sources,
e.g. to a higher order control system.
Input G (gate input)
The counter is stopped with a 1 signal.
Input L (input for external latch
pulse)
At a rising edge, the module stores
the current counter value in the
latch memory upon request.
Input S (input for external status)
The encoder's fault signal output
can be connected to the status input.
The module transmits the input
status to the head module with the
status information.
Additional module functions:
Counter overflow
Period length measurement
The resolution is 200 ns.
Set counter status
Incremental encoder operating
mode
The counter outputs and the output for
the incremental encoder's zero pulse
are connected to the dual-pole inputs.
Inputs A, B
The first channel of the encoder is
connected to input A, the second to
input B.
Input C
The output for the incremental encoder's
zero pulse is connected to
input C. Upon request, the module
stores the counter value at the time
of the zero pulse in the latch memory.
Counter operating mode
In counter mode the module's dualpole
differential inputs A, B, C have
different functions to those of incremental
encoder mode.
Input A (Count)
Input A is used to connect the
counter pulses.
Input B (Up/down)
At a 0 signal the module counts forwards.
At a 1 signal the module
counts backwards.
Input C (Gate/Latch)
The counter is stopped with a 1 signal.
Upon request, the module
stores the current counter value in
the latch memory.
The single-pole inputs have the same
function in both operating modes.
Wiring
][Verdrahtung ST INC
The module's connections are galvanically
isolated from the module
supply and periphery supply.
For EMC reasons we recommend
that you operate inputs A, B, C exclusively
as differential inputs with
inverted signals (A+/A-, B+/B-, C+/
C-).
The module evaluates open differential
inputs (A+/A-, B+/B-, C+/C-)
as a 1 signal.
The module evaluates open function
inputs (G, L, S) as a 0 signal.
Use twisted pair cables to carry the
inverted signals. This will increase
the noise immunity.
Use shielded signal cables with metallic
plugs.
On base modules with C-rail:
– Connect the shield to the terminals
on the C-rail.
– Connect the C-rail with low impedance
to the functional earth.
On base modules without C-rail:
– Connect the shield as shown in
the terminal configuration section.
– The module connects the shield
to the functional earth via the
mounting rail.
The channel for the incremental encoder's
zero pulse has a different
designation depending on the manufacturer
(N, C, Z, 0,...)
The supply voltages must be extra
low voltages with safe electrical
separation (PELV or SELV) in accordance
with VDE 0100, Part 410.
Use copper wiring.
][Verdrahtung Zusatz mit C
The terminal configuration as stated
on the front plate applies for base
modules with C-rail. The terminal
configuration as stated in the technical
documentation applies for all
other base modules.
Front view
TK_Frontansicht
A
B
Err
C
PSSu E S
INC
312485
000000
001
11 21
A+ B+
12 22
0V 0V
13 23
(C) (C)
14 24
A- B-
G L
S
PSSu E S
INC
41 41
C+ G
32 42
S S
33 43
(C) (C)
34 44
C- L
3.9-10
Pilz GmbH & Co. KG, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany
Telephone: +49 711 3409-0, Telefax: +49 711 3409-133, E-Mail: pilz.gmbh@pilz.de
PSSu-2011-01