ComBricks User Manual v6.4.0 | January 18| © PROCENTEC
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8.2
Channel structure
Every Channel is electrically isolated and internally connected to the transparent PROFIBUS networks on the
backplane (see
).
The shielding of the PROFIBUS cable is grounded 1-on-1 to the DIN rail.
8.3
Connecting the cable
Connect the cable to the module with a DB9 connector on the front of the module. The DB9 connector must be
suitable for use in Intrinsically safe networks, and the internal termination shall have a value of 200 Ohms.
Do not connect a cable which is connected to non-IS components. This will damage the internal
electronics and makes the use of this module dangerous in Intrinsically Safe segments.
8.4
Grounding system
Always use Direct Grounding with the power supply and the shielding of the PROFIBUS cables. If you do not
want to grou
nd all or some cables to the common ground, the cable shielding should be connected to pin ‘I’. A
capacitor with a parallel high value resistor will separate the 2 potentials (see
If by accident the Direct Grounding is connected with the Indirect Grounding, the Direct Grounding “wins”.
8.5
Baudrate detection
Refer to
paragraph 7.5
for a description of the baudrate detection.
RS 485-IS
Circuit
D
B
9
-IS
Isolation
Circuit
Isolated Area
D
GN
D
To grounding of
other Channels and DIN-rail
4 PROFIBUS
Networks
(Backplane)
Network
Selector
NW0/NW1
1 2 3 4
To
Gr
o
u
n
d
Cl
amp
o
n
b
o
tto
m
o
f
mo
d
u
le
Ex ia voltage
and current
limiters
Scope
Summary of Contents for ComBricks
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Page 132: ...ComBricks User Manual v6 4 0 January 18 PROCENTEC 132 219 ...
Page 213: ...ComBricks User Manual v6 4 0 January 18 PROCENTEC 213 219 44 Certificates ...
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Page 217: ...ComBricks User Manual v6 4 0 January 18 PROCENTEC 217 219 45 Notes ...
Page 218: ...ComBricks User Manual v6 4 0 January 18 PROCENTEC 218 219 ...