Rice Lake 120 Plus Digital Weight Indicator - Manual (Page 39)

Setpoint Operation 35
7.0 Setpoint Operation
Figure 7-1. Setpoint Operation
The following steps describe the internal steps of setpoint operation. To configure setpoints, refer to Section 3.7 on
page 25.
1. Power on the Toggle Flip-Flop Q=1, The CPU output may be high or low depending on the Sn.CONTACT
selection. Also, the XRL gate becomes an inverter.
2. If load (may be gross, net, or display parameters depending on the KIND command) is bigger than
Sn.WAVL, the output of XRL gate is high, otherwise it is low.
3. The timer will begin counting if the load is greater than Sn.WVAL. If not, the timer will load from SW2.
4. The Output of AND gate will be high if the output of OR gate is high. (Depends on Sn.CONDITI
selection.) Otherwise, wait until standstill is high (If Sn.CONDITI = STABLE).
5. Output (Q) of the Toggle F-F changed from 1 to 0 and the COIL also changed state. (NO to NC, or NC to
NO.) And SW1 & SW2 switch over other side, respective changed Comparator BASE and Timer constant.
Comparetor
Time r
Q
Toggle F-F
AND
OR
Standstill
Sn.CONDITI
NORMAL
STABLE
1
0
Sn.CONTACT
-
+
Sn.WV
AL
Sn.WV
AL
x (1-Sx.Hyster)
1
Sn.TIMER Sn.DELA
Y
1
Gross
NET
KIND
R
+5V
N.O
N.C
Consant Load
COIL 0V
120 Plus
CPU
XRL
Power O
n
SET
0
0
SW1 SW2
Display