Burkert Type 8611 - Manual (Page 86)

86
FunctionsoftheConfigurationLevel
Schematic representation of a limit value monitoring referred to fixed process value limits:
PV
2 s 2 s
PVHI
PVLO
24 V
0 V
24 V
0 V
24 V
0 V
24 V
0 V
time
Process value
Active HIGH
(NC valve)
Active HIGH
(NC valve)
Active LOW
(NO valve)
Active LOW
(NO valve)
Process actual value
DLY = 0 s
DLY = 2 s
Figure 63: B_O1; LIMT; Limit value monitoring referred to fixed process value limits
Schematic representation of a limit value monitoring relatively to the variable set-point value:
SETP
PV
24 V
0 V
24 V
0 V
24 V
0 V
24 V
0 V
HYHI
2 s
2 s
HYLO
SETP + HYHI
SETP - HYLO
Set-point
value
Exceeding of
process value
Dropping below
process value
time
Process actual
value
Active HIGH
Active HIGH
DLY = 0 s
DLY = 2 s
Active LOW
Active LOW
Figure 64: B_O1; LIMT; limit value monitoring relatively to the variable set-point value
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Type 8611