KROHNE H54 M4 EN - Manual (Page 14)

14 H54 Installation and operating instructions
D D
FE
10 Electrical signal output ESK3-PA
10.1 Bus
cable
The statements of the FISCO model only apply if the bus cable used fullfills the following specifications:
R´ = 15...150 Ohm/km
L´ = 0.4...1 mH/km
C´ = 80...200 nF/km.
10.2
Shielding and grounding
In order to ensure optimum electromagnetic compatibility of systems it is very important that the system
components, and in particular the bus cables which connect the components, are shielded and that
these shields form an electrically unbroken envelope as far as possible.
10.3 PROFIBUS-PA
connection
For the connection of the bus cable refer to the adjacent figure.
Connect the cable conductors to D and D- (polarity reversal
does not have any influence). The cable shield should be connected
with minimum length to the functional grounding FE.
10.4
Technical data of the ESK3-PA
Hardware to IEC 1158-2 and the FISCO model
Supply voltage via 2-wire bus connection: .........9 to 32 V DC
Basic current .......................................................12 mA
Starting current ...................................................< Basic current
FDE (fault drop electronics) ................................< 18 mA
Accuracy to VDI/ VDE 3513................................1.6
Measured value resolution..................................< 0.1% of upper range value
Temperature influence ........................................< 0.05% / K of upper range value
Software
GSD ..................................(device master file) is supplied on a diskette
or via Internet www.krohne.com
Device profile ....................Complete implementation of Profile B, V3.0
Function blocks
Flow rate (AI0) ..................Optionally for volume or mass rate of flow
Default units: Qv [m3/h]; Qm [kg/h]
Counter (TOT0).................Volume counter Default unit: [m3]
Counter (TOT1).................Mass counter Default unit: [kg]
Address range...................0-126, default 126 ("Set slave address" is supported)
SAPs .................................Service_Access_Points 1
DD .....................................Device Description DD for PDM
Operation ..........................Via PROFIBUS PA (no local operation at the instrument)