Instruction manual

2
INM4840-5 Nov 2007
2
HART transmitters
and valve
1–16
To up to 31 MTL4841 communications modules
MTL4841
communications
modules
2
31
1
Each MTL4841 handles up to 16 MTL4842
HART interface modules*
1
2
3
16
HART HART
Each MTL4842 handles up to 16 HART
transmitters or valve positioners
MTL4842
HART
interface
modules
4/20mA
+ HART
signals
Workstation PC
running instrument
management software
Up to 7936 * HART
®
devices
RS232/485
convertor
1
2
I
P
MTL4046P
MTL4041 B
16
I5
I
P
Process control
system eg DCS, PLC
3
1–16 1–16
1–16
1–16
HART HART
1–16
HART
signals
HART
signals
Terminal
Terminal
HART
signals
HART
signals
RS232
RS485
Notes:
The diagram shows a mix of IS and general purpose applications
(Refer to your local code of practice for rules governing the segregation of IS and non-IS loops)
* The number of HART devices that can be supported may be dependent on the instrument management software selected.
HART
®
is a registered trademark of the HART Communication Foundation
Safe area
Hazardous area
Figure 2.1 - System Overview ( typical installation)