Endress+Hauser Proline Prosonic Flow 93C Description Of Device Functions page 75

Device functions Proline Prosonic Flow 93C PROFIBUS DP/PA
Endress+Hauser
OUTPUTS → RELAY OUTPUT (1 to 2) → CONFIGURATION
SWITCH-OFF DELAY
!
(4704)
This function is not available unless LIMIT was selected in the ASSIGN RELAY
function (4700).
Use this function to define a delay (0 to 100 seconds) for dropout (i.e. signal changes
from 1 to 0) of the relay output.
The delay starts when the limit value is reached.
The relay output does switch when the delay has timed out and the switch condition has
been valid throughout the delay time.
User input:
Fixed point number 0.0 to 100.0 s
Factory setting:
0.0 s
MEASURING MODE
!
(4705)
This function is not visible unless a limit value was assigned to the relay output.
Use this function to define the measuring mode for the relay output.
Options:
STANDARD
The relay output signal switches at the defined switch points.
SYMMETRY
The relay output signal switches at the defined switching points, irrespective of the sign.
If you define a switch point with a positive sign, the relay output switches as soon as the
value is reached in the negative direction (negative sign), (see illustration).
Factory setting:
STANDARD
Example for the SYMMETRY measuring mode:
Switch-on point Q = 4
Switch-off point Q = 10
m
n
!
• SYMMETRY cannot be selected unless the values in the ON-VALUE (4701) and
• If the signs of the two values differ, SYMMETRY cannot be selected and an
Functional description
(only with PROFIBUS DP)
Note!
Note!
= Relay energized
= Relay de-energized
Q
10
4
0
- 4
- 10
➀ ➁
Note!
OFF-VALUE (4703) functions have the same sign or one of the values is zero.
"ASSIGNMENT NOT POSSIBLE" message is issued.
6 Block OUTPUTS
t
➀
➀ ➁ ➀
A0001247
75