Appendices
Bushealth Measurements
A
A-9
Profibus PA/31.25 kBits/s
Profibus PA (Process Automation) is optimized for
process control with focus on explosion safety. The wires
are marked Data + and Data – and carry a DC supply
with superimposed data. Additionally there are wires with
DC power only. Data traffic is continuous.
To check this bustype, ScopeMeter Channel A is on and
alternately AC coupled for data or DC coupled to test the
DC supply. The recommended probe is STL120 (1:1).
The probe tip must be connected to the Data + line; the
COM input (or Black Ground Lead) to the Data – line. The
figures below show some connector types.
A: Data+ and Pwr
B: Data- and Pwr
C: Optional Pwr+
D: Optional Pwr-
Caution
When planning tests on this bustype, make
sure the proper safety rules are adhered to!
Ethernet Coax/10Base2
To check this bustype, ScopeMeter Channel A is on and
DC coupled. The recommended Banana to BNC Adapter
BB120 (1:1) allows Channel A to connect with BNC
cables. To connect to the System Under Test use a
PM9083 male BNC to dual Female BNC adapter (T-
piece, optional), and an extra BNC cable (PM9092,
optional) as shown in the figure below. Bear in mind that
in Ethernet cabling should only be interrupted for a few
seconds during normal process operation. Data traffic
usually is continuous.
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