Siemens SITRANS F M Intermag 2, Operating Instructions Manual

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Installation
3-11
SITRANS FM Intermag 2 Flow Transmitter
Operating Manual - A5E00102775-03
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Use signal cables with twisted wire pairs if the analog output and
pulse/frequency output are used simultaneously and signals are
transmitted in one cable.
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A load of at least 230 Ω must exist in the signal circuit (see also
technical data) for error free communication via the HART protocol.
When connecting to PROFIBUS also observe the following points:
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Only use shielded cables for the PROFIBUS connection. The
Siemens 6XV1 830-5BH10 (black) cable type is recommended. Any
connection polarity is possible.
The shield must be laid to cover
all assigned terminal boxes,
distributors up to the coupler or link.
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The cable shield must have good contact with one of the grounding
clamps above the connection terminals.
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To ensure trouble-free communication, the PROFIBUS must have a
bus terminator at both ends. This is usually already provided by the
coupler or link at the control system end. An additional bus
terminator must be fitted at the remote bus end.
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The total maximum current consumptions of all devices connected
to the bus may not exceed the current bearing capacity of the bus
feeder. You should therefore plan a reserve for the value of the
maximum increase in current caused by a failure of one of the
devices connected to the bus.
In SITRANS FM Intermag 2 the increase due to failure is
electronically limited to a maximum 5mA.
You will find general information about the PROFIBUS installation in
the Brief Technical Description /1/.
Ground connection for signal cable shield
Digital output 2 (relay) or digital input
Digital output 1 (active/passive)
Analog output (active) 4 to 20 mA resp. PROFIBUS
Power supply: L/N for 100 to 230 V AC
L+/L- for UC 24 V
Terminal for PE conductor
3 4 5 6 7 8 1 2
Figure 3-11 Connection diagram for power supply and signal cables