VEGA WEIGHTRAC 31 Foundation Fieldbus - Manual (Page 66)

66
11 Supplement
WEIGHTRAC 31 • Foundation Fieldbus
42375-EN-131120
Ʋ Internal load 250 Ω
Switching input
Ʋ Type of input - Open Collector 10 mA
Ʋ Type of input - Relay contact 100 mA
Output variable - Mass flow rate measurement
Output
Ʋ Signal digital output signal, Foundation Fieldbus protocol
Ʋ Physical layer according to IEC 61158-2
Damping (63 % of the input variable) 0 … 999 s, adjustable
Channel Numbers
Ʋ Channel 1 Process value (mass flow rate)
Ʋ Channel 8 Electronics temperature
Ʋ Channel 9 Pulse rate
Transmission rate 31.25 Kbit/s
Current value 10 mA, ±0.5 mA
Resolution, digital > 0.1 mm (0.004 in)
Relay output
Output
Relay output (SPDT), floating spdt
Switching voltage
Ʋ Min. 10 mV
Ʋ Max. 253 V AC, 253 V DC
Switching current
Ʋ Min. 10 µA
Ʋ Max. 3 A AC, 1 A DC
Breaking capacity
Ʋ Min. 50 mW
Ʋ Max. 750 VA AC, 40 W DC
If inductive loads or stronger currents are switched
through, the gold plating on the relay contact surface will
be permanently damaged. The contact is then no longer
suitable for switching low-level signal circuits.
Contact material (relay contacts) AgNi or AgSnO and Au plated
Transistor output
Output
Floating transistor output, permanently shortcircuit-proof
Load current < 400 mA
Voltage loss < 1 V
Switching voltage < 55 V DC
Blocking current < 10 µA