Proline Promag H 300
Endress+Hauser 35
FOUNDATION Fieldbus
Twisted, shielded two-wire cable.
For further information on planning and installing FOUNDATION Fieldbus networks see:
• Operating Instructions for "FOUNDATION Fieldbus Overview" (BA00013S)
• FOUNDATION Fieldbus Guideline
• IEC 61158-2 (MBP)
Modbus RS485
The EIA/TIA-485 standard specifies two types of cable (A and B) for the bus line which can be used
for every transmission rate. Cable type A is recommended.
Cable type A
Characteristic impedance 135 to 165 Ω at a measuring frequency of 3 to 20 MHz
Cable capacitance < 30 pF/m
Wire cross-section
> 0.34 mm
2
(22 AWG)
Cable type Twisted pairs
Loop resistance ≤110 Ω/km
Signal damping Max. 9 dB over the entire length of the cable cross-section
Shield Copper braided shielding or braided shielding with foil shield. When grounding
the cable shield, observe the grounding concept of the plant.
Current output 0/4 to 20 mA
Standard installation cable is sufficient.
Pulse/frequency/switch output
Standard installation cable is sufficient.
Double pulse output
Standard installation cable is sufficient.
Relay output
Standard installation cable is sufficient.
Current input 0/4 to 20 mA
Standard installation cable is sufficient.
Status input
Standard installation cable is sufficient.
Connecting cable for transmitter - remote display and operating module DKX001
Standard cable
A standard cable can be used as the connecting cable.
Standard cable 4 cores (2 pairs); pair-stranded with common shield
Shielding Tin-plated copper-braid, optical cover ≥ 85 %
Capacitance: core/shield Maximum 1 000 nF for Zone 1, Class I, Division 1
L/R Maximum 24 µH/Ω for Zone 1, Class I, Division 1
Cable length Maximum 300 m (1 000 ft), see the following table
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