Siemens SITRANS F M TRANSMAG 2 Operating Instructions Manual page 58

Functions
7.5 Function Group Device Outputs
CAUTION
At high inductive loads, the digital output must be protected against transient overvoltage
with a suitable external recovery diode.
The electronic fuse is tripped in the event of overloading. The recovery time of the fuse is a
few minutes. The relay contact is open in the no-load state.
Digital input (Menu item 4.3)
The digital input is available with the device variant 7ME5034-2xxxx (Hart communication
and digital input). You have the following setting options in this menu:
● Function, menu item 4.3.1
● Signal type, menu item 4.3.2
56
By applying an external power supply, you can create a switching input, for example
using a switch (see also Figure 5-12). You have the following possibilities depending on
the configuration:
– Set the measured value to "0" (all outputs and displays are reset to zero and the
totalizers are stopped
– Reset the forwards totalizer
– Reset the reverse totalizer
– Reset the net totalizer
– Reset all totalizers
elektronische
Sicherung
5 V
Ri 3k
① Electronic fuse
② External switch
③ External supply 11 ... 24 V (max. 30 V)
Figure 7-9 Circuit diagram of digital input
You can determine the signal type (high-active) with this.
ext. Schalter
+
3
-
4
Operating Instructions, 11/2009, A5E00102775-07
ext. Versorgung
max. 30 V
SITRANS F M TRANSMAG 2