Endress+Hauser RMS 621 - Page 47

RMS 621 6 Commissioning
Endress+Hauser 47
Type Negative
Positive
Makes it possible to transmit pulses in a positive or negative
direction (e.g. for external electronic totalizers):
• ACTIVE: the device internal power supply is used (+24 V)
• PASSIVE: external power supply necessary
• POSITIVE: rest peak at 0 V ("active-high")
• NEGATIVE: rest peak at 24 V ("active-low") or external
power supply
Unit g, kg, t for mass sum
signal source
kWh, MWh, MJ for heat
sum signal source
dm3 for flow signal source
Pulse output engineering unit.
!
Note!
Pulse engineering unit depends on the signal source selected.
Unit value 0.001 to 10000.0
1.0
Setting as to which value a pulse corresponds to (unit/pulse).
!
Note!
The max. possible output frequency is 50 Hz. The suitable
pulse value can be determined as follows:
Set width Yes
No
The pulse width limits the max. possible output frequency of
the pulse output.
Standard = pulse width fixed, i.e. always 100 ms.
User defined = pulse width can be freely configured.
Pulse width 0.01 to 10.00 s Configuration of the pulse width suiting the external totalizer.
The maximum permitted pulse width can be calculated as
follows:
Function (menu item) Parameter setting Description
PASSIVE-NEGATIVE
ACTIVE-NEGATIVE
ACTIVE-POSITIVE
PASSIVE-POSITIVE
ACTIVE
Internal
power supply
24VDC
Push-
Pull
For continuous currents up to 15 mA
12
12
13
13
Short-circuit
proof output
Short-circuit
proof output
Open
Collector
External
power supply
U =30VD
C
max
PASSIVE
For continuous currents up to 25 mA
NEGATIVE pulses
POSITIVE pulses
Pulse value
Estimated max. flow (end value)
Desired max. output frequency
2 x max. output frequency
Pulse width