KROHNE BM 702 - Output Signal Variants and Communication; Output Variants for BM 70 A;P; Output Variants for BM 702

Page: 6 BM 70 X Project Engineering Guidelines 01/2001
4 Output
4.1 Variants
BM 70 A, BM 70 P:
Variant Comments Described
in Section
Ex-e current output HART
®
Ex-e; active; HART
®
protocol;
together with switching output and digital input
4.2 + 4.4
Ex-i (IS)
current output
HART
®
intrinsically safe; passive; HART
®
protocol
(optional with IS switching output)
4.3 + 4.4
Current output Ex-e; active; not communicable 4.5
RS 485 + current output BM70 protocol or ModBus-RTU or HART
®
4.6 + 4.5
PROFIBUS-PA intrinsically safe; see Supplementary Instructions -
Foundation Fieldbus (FF) intrinsically safe; see Supplementary Instructions -
BM 702:
Ex-i (IS)
current output HART
®
intrinsically safe; passive; HART
®
protocol 4.3 + 4.4
PROFIBUS-PA intrinsically safe; in preparation -
Foundation Fieldbus (FF) intrinsically safe; in preparation -
All versions with HART
®
or BM70 protocol can be operated with the PC program PC-CAT
(see Section 7.7.7).
Overview of digital communication possibilities:
BM 70 A
HART specific software
and operating devices
Converter
HART-
HHC
HAR T Com muni cat or
HART
FIELD CO MMUNICATIONS PROTOCOL
O
I
>>>
F1 F2 F3 F4
A B C D E F G H I
7 8 9
J K L M N O P Q R
4 5 6
S T U V W X Y Z /
1 2 3
# % & < > : +
0 . _
*
HART-Master
Tank Inventory System
4 ... 20mA
+ HART
Modbus RTU
...........
Other
communication interfaces
RS 485
RS 485
4mA
(
Ex i
)
+ HART
PC-CAT
or
HAR T Com muni cat or
HART
FIELD CO MMUNICATIONS PROTOCOL
O
I
>>>
F1 F2 F3 F4
A B C D E F G H I
7 8 9
J K L M N O P Q R
4 5 6
S T U V W X Y Z /
1 2 3
# % & < > : +
0 . _
*
HART-
HHC
Point-to-point Multidrop