Rockwell Automation 1760-xxxx Pico Controller User Manual - Manual (Page 108)

Publication 1760-UM001D-EN-P - September 2005
4-48 Draw a Circuit Diagram with Pico
Parameter Display
Parameter Description
A1 Analog value comparator function relay 1.
EQ Equal mode.
The function rerlay has the following modes:
• LT - less than
• LE - less than/equal to
• EQ - equal to
• GE - greater than/equal to
• GT - greater than
+ + appears in the Parameter menu.
- does not appear in the Parameter menu.
I1 Comparison value 1 (positive value I7, I8, I11, I12; actual value T1 to T16,
C1 to C16).
F1 Gain factor for I1 (I1=F1 x actual value at I1); F1 = positive value from 0 to
9999.
I2 Comparison value 2 (positive value I7, I8, I11, I12; actual value T1 to T16,
C1 to C16).
F2 Gain factor for I2 (I2=F2 x actual value at I2); F2 = positive value from 0 to
9999.
OS Offset for the value of I1 (I1 = OS + plus actual value at I1); OS = positive
value from 0 to 9999.
HY Switching hysteresis for value I2.
Value HY applies both to positive and negative hysteresis.
• I2 = Actual value at I2 + HY
• I2 = Actual value at I2 - HY
• HY = Positive value from 0 to 9999.
EXAMPLE
Analog comparator ‘A1’ latches (sets) relay Q1 if the
actual value drops below the lower setpoint value of
7.1 V. Comparator ‘A2’ unlatches (resets) the relay if
it rises above the upper setpoint value of 7.5 V. Thus,
the difference (switching hysteresis) between the
two voltage setpoint values is 0.4 V.
A1 EQ
I1 +0
F1 +0
I2 +0
F2 +0
OS +0
HY +0
I1-A1------SQ1
A2------RQ1