Proline Promass 83E/F/O Description of Device Functions - FMC ...

7 Block OUTPUTS Device Functions Proline Promass 83
Function description
OUTPUTS PULSE/FREQUENCY OUTPUT (1...2) CONFIGURATION (FREQUENCY)
OUTPUT SIGNAL
(continued)
In the operating status (flow present), the output signal level changes from 0 V to a
positive voltage level.
U (V)
t
A0001975
Example for output configuration PASSIVE-POSITIVE:
Output configuration with an external pull-down resistance.
In the quiescent state (at zero flow), a positive voltage level is measured via the
pull-down resistance.
+ U
max
=30VDC
U (V)
m
U (V)
o
t
n
p
t
m = Open collector
n = Pull-Down-Resistance
o = Transistor activation in “POSITIVE” quiescent state (at zero flow)
p = Output signal level in quiescent state (at zero flow)
A0004689
In the operating status (flow present), the output signal level changes from a positive
voltage level to 0 V.
U (V)
t
A0001981
Example for output configuration PASSIVE-NEGATIVE:
Output configuration with an external pull-up resistance.
In the quiescent state (at zero flow), the output signal level at the terminals is at a positive
voltage level.
+ U
max
=30VDC
U (V)
m
n
U (V)
o
t
p
t
m = Open collector
n = Pull-Up-Resistance
o = Transistor activation in “NEGATIVE” quiescent state (at zero flow)
p = Output signal level in quiescent state (at zero flow)
A0004690
In the operating status (flow present), the output signal level changes from a positive
voltage level to 0 V.
U (V)
(continued on next page)
t
A0001981
Page 82 • MN0M023
Issue/Rev. 0.2 (12/12)