Rockwell Automation 1771-CFM,D17716.5.99 CONFIGURABLE FLOWMET - Manual (Page 62)

Schematics B–2
Publication 1771Ć6.5.99 - December 1995
Signal characteristics
50mV threshold Input 50mV threshold
Turbine flowmeter or magnetic pickup
F0 F1 F2 F3
Turbine flowmeter or magnetic pickup
(50mVĆ142V ac rms)
The signal:
12 16 24 28 + turbine flowmeter or magnetic pickup
The signal:
• should be approximately sinusoidal
• must be ac
11 15 23 27 - turbine flowmeter or magnetic pickup
must be ac
• must be > 100mV and < 400V F0 RET F1 RET F2 RET F3 RET us be 00 a d 00
peakĆtoĆpeak Input Return
500mV threshold Input
Turbine flowmeter or magnetic pickup
F0 F1 F2 F3
Turbine flowmeter or magnetic pickup
(500mVĆ142V ac rms)
The signal:
h ld b i t l i id l
10 14 22 26 500mV Ċ connect to each corresponding RET
• should be approximately sinusoidal
• must be ac
• must be > 1V and < 400V
12 16 24 28 + turbine flowmeter or magnetic pickup
• must be > 1V and < 400V
peakĆtoĆpeak 11 15 23 27 - turbine flowmeter or magnetic pickup
F0 RET F1 RET F2 RET F3 RET
Input Return
1.3V threshold (TTL) Input ( )
Compatible with open collector.
F0 F1 F2 F3
Compatible with open collector.
The signal should be dc pulses with
width > 4us.
9 13 21 25 1.3V (TTL) Ċ connect to each corresponding RET
The TTL mode is compatible with TTL,
4000 series CMOS, and most 0Ć24V
systems The TTL mode in not
12 16 24 28 + logic circuit
systems. The TTL mode in not
compatible with any signal format with
dc pulses riding on a fixed dc level > 1.3V.
11 15 23 27 - logic GND
p g
F0 RET F1 RET F2 RET F3 RET
Input Return
12" V threshold (+24V RET)
Input
This specialized mode is compatible with
signal format with pulses riding on a fixed
F0 F1 F2 F3
signal format with pulses riding on a fixed
dc level > +1.3V.
Example
Bently Nevada Proximity Pickup Series
12 12 16 24 28 + proximity pickup (active sensor)
Bently Nevada Proximity Pickup Series
3300 (5mm and 8mm) where the active"
sensor signals are with a 5V offset.
The signal resides between 5Ć18V
18 18 20 20 - proximity pickup (active sensor)
The signal resides between 5Ć18V,
therefore, it passes through the threshold
of 12"V as referenced to the
S0 RET S1 RET S2 RET S3 RET
of 12"V as referenced to the
+24V dc RET. Input Return
# wiring arm terminal number Signal threshold (500mV or 1.3V) is selected by jumpering the appropriate level to the appropriate RET.