Rockwell Automation 1760-xxxx Pico Controller User Manual - Manual (Page 109)

Publication 1760-UM001D-EN-P - September 2005
Draw a Circuit Diagram with Pico 4-49
The parameter settings are:
Timing Diagram:
A1 sets relay output Q1 (A) up to a voltage of 7.1V. The hysteresis (B)
is between 7.1V and 7.5V. At 7.5V, A2 causes the relay to reset (C). Q1
drops out and does not pick up again until A1 is set at 7.1V (D).
Program Analog Comparators
You integrate an analog comparator into your program in the form of
a contact. Use the parameter display to select one of six possible
comparators and enter the setpoint values.
1. Enter the relay contact for the analog comparator in the contact
field.
The cursor moves to the contact number of the comparator.
IMPORTANT
Analog signals of sensors typically fluctuate by
several millivolts. For stable set and reset switching,
the setpoints should differ by at least 0.2V (switching
hysteresis).
ATTENTION
To prevent the uncontrolled switching of the relay
coils only use the Set and Reset functions with the
analog comparators.
A1 LE
I1 +7.1
F1 +0
I2 +0
F2 +0
OS +0
HY +0.4
A2 GE
I1 +7.1
F1 +0
I2 +7.5
F2 +0
OS +0
HY +0.4
on
7,5
7,1
10
5
[V]
A1 A2
I7
A1
A B C D
Output
A 1 ---------SQ3