ABB FSM4000 - Pulse Output

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FSM4000 ELECTROMAGNETIC FLOWMETER | DS/FSM4000-EN REV. L
—
… Transmitter
Pulse output
Active pulse output
Pulse
output, passive, optocoupler
I
internal
E
external
Figure 41: Pulse output, active and passive, optoelectronic coupler
Current output active with / without HART protocol (4 ... 20 mA)
Terminals
51, 52
Current output
can be selected via software
Operating mode
Active / passive, selectable via jumper (see
‘Commissioning’ chapter in operating
instruction)
f
max
5 kHz
f
min
0.00016 Hz
Adjustment range
Pulse / unit, pulse width (observe dynamic
limits)
Function
Active
• 150 Ω ≤ load < 10 kΩ:
pulse width ≤ 50 ms,
max. pulse frequency ≤ 3 Hz,
• 500 Ω ≤ load < 10 kΩ
pulse width ≤ 0.1 ms,
max. pulse frequency: 5 kHz
Passive
• ‘closed’:
0 V ≤ U
CEL
≤ 2 V, 2 mA ≤ I
CEL
≤ 220 mA
• ‘open‘:
16 V ≤ U
CEH
≤ 30 V, 0 mA ≤ I
CEH
≤ 2 mA
PROFIBUS PA® / FOUNDATION Fieldbus®
I
internal
1
PROFIBUS PA
E
external
2
FOUNDATION Fieldbus
Figure 42: Digital communication PROFIBUS PA / FOUNDATION Fieldbus
The resistance R and condenser C form the bus termination.
They must be installed when the device is connected to the
end of the entire bus cable.
R = 100 Ω; C = 1 µF
Bus termination for S4 transmitter
1
Terminal board for field mount
housing
2
Hook switch for closing the bus
termination
Figure 43: Bus termination
To terminate the bus if the instrument is at the end of the
bus cable, the termination components in the S4 transmitter
can be used. To do so, close both hook switches in the
connection area of the transmitter.
Note
If the transmitter module is removed, bus termination is also
canceled.