
40
Reference Manual
00809-0100-4140, Rev AA
January 2017
2.12
System readiness
If using HART based control or asset management systems, confirm the HART
capability of such systems prior to commissioning and installation. Not all systems
are capable of communicating with HART revision 7 devices.
For instructions on how to change the HART revision of your point level detector,
see
“Switching HART Revision” on page 8
Verify the latest Device Driver (DD/DTM) is loaded on your systems to ensure
proper communications.
2.12.1
Confirm correct Device Driver (DD)
1.
Download the latest DD from
Emerson.com
(or
2.
In the
Browse by Member
drop-down menu, select Rosemount business unit of
Emerson Process Management.
3.
Select Rosemount 2140.
2.13
Establishing multi-drop communications
(optional)
Multi-dropping refers to the connection of several devices to a single communications
transmission line. Communication between the host device and another device takes place
digitally with the analog output of the level detector deactivated.
Multi-drop installation requires consideration of the update rate necessary from each
device, the combination of different device types, and the length of the transmission line.
Communication with devices can be accomplished with HART modems and a host
implementing the HART protocol. Each device is identified by a unique address and
responds to the commands defined in the HART protocol.
Field Communicators and AMS Device Manager can test, configure, and format a
multi-dropped device the same way as a device in a standard point-to-point installation.
shows a typical multi-drop network.
Note
A multi-drop device in HART Revision 7 mode has a fixed analog output of 4 mA for all but
one device. Only one device is allowed to have an active analog signal.
Summary of Contents for Rosemount 2140
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Page 14: ...4 Reference Manual 00809 0100 4140 Rev AA Introduction January 2017 Introduction ...
Page 112: ...102 Reference Manual 00809 0100 4140 Rev AA Troubleshooting January 2017 Troubleshooting ...
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