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Technical data
10.3 Inputs
SITRANS F Ultrasonic flowmeters FST030 (Modbus)
116
Operating Instructions, 08/2017, A5E37367739-AC
Description
Specification
Default parity
Even
Default device address
1
10.3
Inputs
Table 10- 3 Digital input (Channels 3 and 4)
Description
Channels 3 and 4
Load
15 to 30 V DC, R
in
7 kOhm
Functionality
•
Reset totalizer 1, 2 or 3
•
Reset all totalizers
•
Freeze process values
•
Force outputs
Table 10- 4 Current input (Channels 3 and 4)
Description
Channels 3 and 4
Signal range
•
0 to 20 mA (EX-version)
•
0 to 25 mA (non-EX-version)
Resolution
0.5 µA
Load
•
<470 Ohm (EX-version)
•
<770 Ohm (non-EX-version)
Time constant (adjustable)
0,0 to 100 s
Fault current
Measurement range (mA)
Minimum alarm (mA)
Maximum alarm (mA)
US:
4 to 20.8
3.75
22.6
NAMUR:
3.8 to 20.5
3.5
22.6
Customized fail-safe mode
•
Last valid value
•
Lower fault current
•
Upper fault current
•
Fail-safe value
•
Current value
Galvanic isolation
•
All inputs and outputs are galvanically isolated PELV circuits with
60 V DC isolation from each other and ground. Maximum test volt-
age: 500 V AC