Table of Contents
Advertisement
HART Multiplexer System KFD*-HM*-16
Product specification
3.1.4
Galvanic isolation
Attention
3.1.5
All the functions at a glance
he voltage supply, the analog signals and the RS 485 interface are galvanically
separated. This galvanic isolation is achieved through the use of transformers and
opto couplers.
For the direct current components, the individual HART channels are isolated by
means of two capacitors. Thus the 4 mA ... 20 mA signal is not affected.
The connected current repeaters are galvanically interconnected unilaterally
through the common ground connection of the analog signals.
If the galvanic isolation is to be properly maintained, the individual ground cables
must be isolated by capacitors. Suitable Fl and MB boards can be supplied by
Pepperl+Fuchs for this purpose.
Notwithstanding the common ground connection of the analog signals from the
Masters/Slaves, the galvanic isolation of the current repeaters is secured if
•
FI and MB boards are used, which are fitted with capacitors.
•
KFD2-STC4-Ex1 or KFD2-STC4-Ex2 Ex isolation modules are used as current
repeaters.
The following list gives all the functions once again at a glance:
•
16 channels, extendable to 256 channels by the connection of up to
15 KFD0-HMS-16 Slaves
•
up to 7936 loops per interface (31 Multiplexers with in each case 256 channels)
•
automatic search of all existing HART field devices (REBUILD)
•
facility for self-standing cyclic interrogation of the HART variables (SCAN)
•
acts as a primary or secondary Master
•
fast RS 485 interface (multidrop) with up to 38400 Baud
•
integrated modem
•
removable terminals
•
supply via Power Rail
•
approval for zone 2
11
Advertisement
Table of Contents
