Endress+Hauser RIA452 Betriebsanleitung Seite 83

RIA452
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Function (menu item)
Ref. num.
Function
Dec. point
Setpoint A
Setpoint B
Hysteresis
Delay
Alternate
Sw. delay
Sw. period
Runtime
Count
Reset
Simu relay
Endress+Hauser
6.3.5 Limit values - LIMIT 1 to 8/M10 to 17
Note!
If the "Batch" function is used, limit values 1 and 2 are permanently assigned activation in the event
of a "preset counter" and "preliminary alarm" limit value. These limit values cannot be configured.
They are not shown in the menu structure.
Parameter setting
Input
Lin. table
Off
Min
Max
Grad
In band
Out band
Alarm
XXXXX
XXXX.X
XXX.XX
XX.XXX
X.XXXX
-99999 to 99999
0.0
-99999 to 99999
99999
-99999 to 99999
99999
0 to 99
0
No
Yes
0..99
0
0..999
0
No
Yes
Off
Low
High
Description
Selects which value is used:
• Input: scaled value from analog input
• Lin. table: value from linearization table
Selects limit value and fault monitoring. In the event of device errors or incorrect
input values (see error limits Range 1 to 4 in Section 6.3.11), the relays are
switched in accordance with the failsafe mode configured in Rel. Mode
(see Section 6.3.11).
• Min: minimum with hysteresis (see Page 84)
• Max: maximum with hysteresis (see Page 84)
• Grad: gradient (see Page 85)
• In band: validity range within two values
• Out band: validity range outside of two values
• Alarm: relay is used as an alarm relay
Number of digits after the decimal point for the limit value.
Measured value at which a change in the switch status occurs (slope for gradient).
Default: 0.0
The second setpoint can be configured for the "In band" and "Out band" operating
modes and is only visible if one of these two functions was selected for this relay.
For entering the hysteresis for the threshold at minimum/maximum as an abso-
lute value.
Sets the limit value event delay once the threshold is reached (in seconds)
(see Page 86).
Determines the switching function for this relay:
• No: no alternating function; switch point permanently assigned to relay
• Yes: alternate function (see Page 87)
The starting time for 24-hour counting can be selected with Sw. delay. Every time
the instrument is reset, the process of measuring 24 hours and the delay time is
restarted.
Example see Page 88
Limit value is activated cyclically every 24 hours for [Sw. period] seconds. The
activation is delayed by [Sw.delay] hours by changing the hour value (example
see Page 87).
Displays the run time of the connected device, e.g. pump, in hours [h].
Records the switching frequency of the limit value.
Resets the run time and switching frequency for this limit value.
Simulation of the selected limit value. Is automatically set to Off when the menu
item is exited.
Commissioning
83