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Physikalisch-Technische Bundesanstalt
Braunschweig and Berlin
Schedule to EC Type Examination Certificate PTB 11 ATEX 2021 X
PROFIBUS DP, RS-485-IS
RS-485-IS fieldbus connection ............... in type of protection Intrinsic Safety Ex ib IIC
(D-SUB port X1, pin 3, 5, 6, 8)
External RS-485-IS fieldbus system ....... in type of protection Intrinsic Safety Ex ib IIC
Lines (loop resistance) ........................... cable type A or B acc. to EN 60079-25 with
Note!
Specifications on the maximum permissible external reactances on the fieldbus connections of
the individual devices in the external RS-485-IS fieldbus network are not applied in this EC Type
Examination Certificate.
This EC type examination certificate may only be reproduced without changes.
Excerpts or modifications are to be approved by Physikalisch-Technische Bundesanstalt.
Physikalisch-Technische Bundesanstalt · Bundesallee 100 · 38116 Braunschweig · Germany
EB 3965 EN
[translation of German original]
EC type examination certificates without signature nor seal are invalid.
Max. values:
U
=
4.1 V
o
I
=
82 mA
o
P
=
84 mW
o
Linear characteristic
C
negligibly small
i
L
negligibly small
i
Max. value per pair of terminals:
U
=
4.2 V
i
Max. value of sum per pair of terminals:
I
=
4.8 A
i
the following linear electric constants:
L'/R' ≤
15 µH/Ω
C'
≤
250 nF/km
Braided wire diameter ≥ 0.2 mm
Concentrated reactances across the external
RS-485-IS fieldbus system are not permissi-
ble.
[PTB lettering]
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