Installation manual

3/17
3
3.2
Specifications
Modicon TSX Micro
automation platform 0
Integrated counter channels and counter
modules
This example shows the grouping of objects supplied by a conveyor belt for
packaging.
This simple counting application uses a sensor (proximity sensor, photoelectric
sensor) linked to a preset counter. When the preset value is reached the packaging
command is activated and the control system initiates a new packaging cycle.
In this example objects are upcounted or downcounted in a tunnel. The system
checks that a critical threshold is not crossed in order to detect any malfunction in the
tunnel.
This up/down counting application uses two sensors (proximity sensors or
photoelectric sensors) linked to a threshold up/down counter. Each input sensor
pulse increments the counter, each output sensor pulse decrements it. Crossing the
authorised maximum threshold sets off an alarm.
In this example, the length of objects travelling on a conveyor belt is measured in
order to sort them.
This up/down counting application follows this sequence: a sensor detects the
presence of the object on the conveyor belt. While the object is on the belt, the pulses
from the generator linked to the forward movement of the conveyor belt are counted.
The number of pulses represents an image of the length of the object. This
measurement can then be compared to various minimum and maximum thresholds.
In this example the correct operation of a pump is checked by taking account of its
rotation speed. This speed should lie between a low threshold (pump fault) and a
high threshold (pump cut-out).
The speed of the pump is measured by taking account of the pulses supplied by an
incremental encoder (or proximity sensor) during a unit of time (time base worked out
by the TSX 37 22 PLC system).
The current value obtained is compared to the two predefined thresholds in order to
detect any anomaly.
Applications
Example of upcounting or downcounting
Examples of up/down counting
Example of up/down counting with processing
Time
Pc
V max.
V mini
Alarm
Speed
sensor
Operating direction
Tunnel
Output
sensor
SM
Tunnel total
Max.
Mini
Alarm
Input sensor
Time
Time
Pulse counter
Pc
Item outside
range
Ci
P
resence of item
L mini
Edge
detection
sensor
L max.
SM
Counter
Operating direction
Counter
sensor
Time
D
escription:
p
age 3/16
Characteristics:
page 3/18
References:
page
3/19
Connections:
pages 3/20 and 3/21
Dimensions:
page 3/21
Courtesy of Steven Engineering, Inc. ● 230 Ryan Way, South San Francisco, CA 94080-6370 ● General Inquiries: [phone] ● www.stevenengineering.com
efesotomasyon - telemecanique inverter