Applications; Et Point Monitoring - Endress+Hauser Rma 421 Bedienungsanleitung

Process transmitter

6. Applications

6.1 Set point monitoring
n a 10 m high silo the height is to be displayed, a low set point
of 1.5 m and a maximum set point of 8.5 m are to be
monitored. The hysteresis, in order to avoid relay hunting
around the set point, is in both cases to be set at 0.25 m. The
minimum set point is also to have a switch time delay of 10 sec.
Example:
nput signal and display:
- Sensor signal 0-20 mA equals 0-10 m
- Numeric display should show 0.00-10.00 (m)
- Bargraph should show 0.00-10.00 (m)
Set point 1:
- Minimum safety
- Switch point 1.50 (m)
- Hysteresis 0.25 (m)
- Time delay 10 s
Set point 2:
- Maximum safety
- Switch point 8.50 (m)
- Hysteresis 0.25 (m)
- Time delay 0 s
enu group
SSetting up:
Analogue input
INPUT
Display
DISPL
Set point/fault monitor
Set point/fault monitor
68
Address
Input range
Decimal point
Display value:
Range 0%
Display value:
Range 100%
ode
LIM1
Set point
Hysteresis
Time delay
ode
LIM2
Set point
Hysteresis
Time delay
RANG
DI DP
DI LO
DI HI
MODE1
SETP1
HYST1
DELY1
MODE2
SETP2
HYST2
DELY2
Value
0-20
999,99
0,00
10,00
MIN
1,50
0,25
10
MAX
8,50
0,25
0