Siemens SITRANS F TRANSMAG 2, Руководство по эксплуатации, Страница: 65 / 126

• Failure signal, menu item 4.1.2
In the event of a fault, e.g. a device error or measuring error due to entrapment of air, the
analog output shows a predefined current.
The following settings are possible:
– 3.6 mA
– 22 mA
– 24 mA
– Hold for a defined time (5...240 seconds), then 3.6 mA
– Hold permanently
With the "Hold 5 s" setting you can bypass temporary faults (e.g. air entrapment in the
medium) for up to about 5 s without the analog signal outputting an error message. The
same applies accordingly for "Hold 20 s", "Hold 40 s" etc. The last valid measured value is
output during the fault. If the fault lasts less than 5 s the current measured value is output
at the end of the fault. If the fault persists, the output signal is set to 3.6 mA.
In the "Hold permanently" setting the last valid value is output until the fault is eliminated.
In the current range between 0 and 20 mA, the 3.6 mA failure signal or "Stop" is not
recommended; in this case, the setting ’22 mA’ or ’24 mA’ must be selected.
• Split mode (combined counter), menu item 4.1.4
The Split mode is activated when ’Active’ is selected.
The "Split value" divides the measuring range (URV) set in menu item 3.1.2. The split value
is only effective when it is smaller than the full-scale value (upper range value, URV).
When Split mode is activated, if there is a current flow value in the lower sub-domain (0 to
split value), this sub-domain is shown in a linear way on the set current range (0-20 mA or
4-20 mA), i.e. a current of 20 mA corresponds to the split value. This status can be indicated
on digital outputs 1 or 2, if the "Split value active" function has been set (menu 4.2.1 and
4.3.1)
If the current flow value is within the upper sub-domain (split value to full-scale value), the
range 0 to URV is shown in a linear way on the set current range as for the inactive Split mode.
Functions
8.5 Function Group Device Outputs
TRANSMAG 2 with MAG 911/E
Operating Instructions, 03/2021, A5E00102775-AC
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