Badger Meter SRD/SRI Valve Positioners - Manual (Page 67)

All components that are connected to the SRD in an
explosion hazardous area, require an Ex-Approval The
applicable limit values must not be exceeded in any
case These limit values also have to be adhered to when
connecting additional capacitances, inductances, voltages
and currents
Measuring FoxCom Communication Signal
If a reliable communication signal cannot be received, check
the level with an oscilloscope The first data block always
comes from the configurator and the second block is the
reply from the SRD
FOXCOM measured at
configurator: measured at
SRD:
Configurator trans-
mits (Request) at least
350 mVpp
at least
75 mVpp
SRD transmits
(Acknowledge) at least
75 mVpp
at least
350 mVpp
With Communication PROFIBUS-PA
The operation of the positioner is digital, as per PROFIBUS-PA
Profile Class B according to EN 50170 and DIN 19245 part 4
Data transmission via bit synchronous current modulation
with a speed of 31250 bits via twisted and shielded two-
wire connections according to IEC 1158-2, with cable
shields on both sides and bus terminators according to
recommendation IEC 1158-2
The positioner has to be connected to a segment coupler,
which has to be conforming to IEC 1158-2 For operation
in explosion hazardous areas, a segment coupler in
explosion proof version has to be used Supply as well as
communication takes place via the bus
All components which are connected to the SRD in an
explosion hazardous area, require an Ex-Approval The
therein applicable limit values must not be exceeded in any
event These limit values also have to be adhered to when
connecting additional capacitances, inductances, voltages
and currents The FISCO model is thereby used as a basis
Further information for observance:
”Technical Guide for PROFIBUS-Connection Technique”
PROFIBUS-User Organisation, Order no 2 141
With Communication FOUNDATION Fieldbus
The operation of the positioner is digital, as per FOUNDATION
Fieldbus Specification Rev 1 4 Data transmission via bit
synchronous current modulation with a speed of 31250 bits
of via twisted and shielded two-wire connections according
to IEC 1158-2, with cable shields on both sides and bus
terminators according to recommendation IEC 1158-2
The positioner has to be connected to components which
are conforming to IEC 1158-2 For operation in explosion
hazardous areas, an Ex-separator has to be used Supply as
well as communication takes place via the bus
All components which are connected to the SRD in an
explosion hazardous area, require an Ex-Approval The
therein applicable limit values must not be exceeded in any
event These limit values also have to be adhered to when
connecting additional capacitances, inductances, voltages
and currents The FISCO model is thereby used as a basis
Further information for observance:
“Wiring and Installation 31 25 kBit/s, Voltage Mode, Wire
Medium Application Guide” by FOUNDATION fieldbus
Page 67
System Configuration
August 2014 POS-UM-00009-EN-02