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 voltage:
500 V AC
Cable
1)
● Standard industrial signal cable with up to 3 twisted pairs with overall
screen can be connected between the transmitter and the control
system. Individual pair or overall screen is optional depending on
user requirements.
Voltage range Max. 24 V DC (active)
14 to 30 V DC (passive)
1)
User supplied cables must be suitable for 5°C above surrounding ambient temperature.
Technical data
10.3 Inputs
SITRANS FST030 (Modbus)
124 Operating Instructions, 08/2018, A5E37367739-AD
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