VEGA VEGABAR 87 Modbus and Levelmaster protocol - Operating Instructions - Manual (Page 55)

55
10 Supplement
VEGABAR 87 • Modbus and Levelmaster protocol
46297-EN-131107
Nominal range Overload capacity, max.
pressure
Overload capacity, min. pres-
sure
0 … +5 psig +435 psig -11.60 psig
0 … +15 psig +510 psig -14.51 psig
0 … +30 psig +725 psig -14.51 psig
0 … +150 psig +1300 psig -14.51 psig
0 … +300 psig +1900 psig -14.51 psig
Absolute pressure
0 … 15 psi
510 psi 0 psi
0 … 30 psi 725 psi 0 psi
0 … 150 psi 1300 psi 0 psi
0 … 300 psi 1900 psi 0 psi
Output variable
Output
Ʋ Physical layer Digital output signal according to standard EIA-485
Ʋ Bus specifications Modbus Application Protocol V1.1b, Modbus over serial
line V1.02
Ʋ Data protocols Modbus RTU, Modbus ASCII, Levelmaster
Max. transmission rate 19.2 Kbit/s
Dynamic behaviour output
Run-up time approx.
10 s
Dynamic characteristics, depending on medium, temperature and, if applicable, chemical seal
90 %
100 %
10 %
t
t
T A
t
t
S
2 1
Fig. 28: Behaviour in case of sudden change of the process variable. t
T
: dead time; t
A
: rise time; t
S
: jump response
time
1 Process variable
2 Output signal
Dead time < 45 ms
Rise time > 35 ms (10 … 90 %)
Step response time > 80 ms (ti: 0 s, 10 … 90 %)