Siemens SITRANS F TRANSMAG 2, Руководство по эксплуатации, Страница: 58 / 126

• Limits, menu item 3.1.3, consisting of:
– Low Alarm Limit, menu item 3.1.3.1 and
– High Alarm Limit, menu item 3.1.3.2
The input is made in absolute values within the sensor limits (depending on the nominal
width, corresponding to -13 m/s to +13 m/s). Alarm limits of min. 10% and max. 90% of the
URV are set at the factory.
Exceeding or dropping below these limit values are signaled at digital output 1 or 2 if the
function of these outputs is configured appropriately (menu items 4.2.1 and 4.3.1). In
PROFIBUS communication, these events are reported by the limit bits in the measured value
status.
Note
Devices with PROFIBUS PA
The profile parameters for the "Low Warning Limit" and "High Warning Limit", can be set
independently of the alarm limits by acyclic PROFIBUS communication. They do not appear
in the local operating unit. Exceeding of the warning limits is only signaled by PROFIBUS
communication.
• Hysteresis, menu item 3.1.3.3
The limit values (menu items 3.1.3.1 and 3.1.3.2) can have a hysteresis added to prevent
"fluttering" of the switching output.
①
Measured variable
②
Limit alarm
③
Time
④
Hysteresis - limit max.
⑤
Hysteresis - limit min.
Figure 8-1 Limit value message and hysteresis
Functions
8.4 Function Group Measuring Functions
TRANSMAG 2 with MAG 911/E
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Operating Instructions, 03/2021, A5E00102775-AC