Configuring With Profibus Pa; Magneto-Electrical Measuring Transducer Mem-Ppa - Siemens SITRANS F Operating Instructions Manual

Commissioning

6.5 Configuring with PROFIBUS PA

The dimension unit of the totalizer pursues that of the flow rate (e.g. if the flow rate unit is l/h,
the totalizer will measure in liters).
Pulses are optionally displayed at binary output N1. It must be observed that the maximum
impulse rate amounts to approx. 10 Hz. The pulse width is approx. 50 ms.
● Totalizer
Self test
The MEM possesses various self-test functions for continuous monitoring of the current
measuring values, which may be used to trigger an alarm in case of error.
● Self-test mask
The incidence of a self-test error is signaled under HART in status and, if necessary,
transmitted as an alarm on the current output.
6.5 Configuring with PROFIBUS PA
6.5.1

Magneto-electrical measuring transducer MEM-PPA

PROFIBUS- PA- interface
PROFIBUS- PA divides the parameters that are important for configuring the device in the
system into function blocks. These parameters can only be accessed acyclically. The
function and assignment of these blocks were defined by the PROFIBUS User Organization
(PNO) in the "Profile for process control devices Rev. 2.0, Class B".
The transmitter MEM-PPA exclusively uses Profile 3 area flowmeters, because Profile 2
does not apply to area flowmeters.
The "Physical Block" includes information about the device (e.g. type, profile and
manufacturer).
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The totalizer function of the MEM can be switched ON or OFF via this parameter.
The totalizer value is saved in the EEPROM when the instrument is switched off. The
totalizer can be reset via a HART command.
The MEM self-test possesses the following function range, whereby each control function
can be individually switched ON and OFF:
– Q > 103% (rel. flowrate > 103%)
– Q <> Sensor limits (rel. flowrate outside the sensor limit)
– Sensors too hot/too cold (temperature in device too high/too low)
– A-B unreasonable (sensor signals implausible)
– Meter overflow
– MIN/MAX-limit (shortfalling MIN or exceeding MAX)
Operating Instructions, 02/2013, A5E03821131-01
SITRANS FVA250