Mobrey

D13.0 SMART Interfaces – CompatibilityD13.1 IntroductionThe MOBREY MSM400 SMART slurry monitoring system unit uses the HART digital communicationsprotocol.This was originally developed by Rosemount Inc. in USA, and uses Bell 202 Frequency Shift Keysignalling on top of a 2 wire DC loop supply. The MOBREY MSM400 system conforms to Revision 5.1of the HART protocol.Various other manufacturers use this same HART protocol and produce sensor equipment that can beattached to 4-20mA or digital loops. Similarly there are other hand held communicators that use theHART protocol to interrogate transmitters in such loops. Not all manufacturers’ equipment conforms tothe Revision 5.3 of the protocol.At present the major SMART communicators working to a HART protocol areMOBREY –CK1 and –CK2HART Communicator Model 275 manufactured by RosemountRosemount Model 268Measurement Technology MTL 611 and CNF 41MOBREY H-ViewThis is a rapidly developing field, and the specification of these units is continually being updated. Eachupdating produces better interoperability and user friendly operation. However, even equipmentconforming to the same Revision of the protocol from different manufacturers cannot be regarded ascompatible, because each sensor has a unique programme structure.D.13.2Transmitters recognised by the MOBREY SMART CommunicatorsThe MOBREY-CK1 and –CK2 SMART Communicators can identify and interrogate all variants of theMLT100 and MSP100 ultrasonic level transmitters and MSM400 slurry monitors.If a MOBREY SMART Communicator is connected to a loop with another type of control unit, for eexample the Rosemount 1151 pressure control unit, it will record the presence of an “Unknowninstrument”. Various parameters can be read and a limited set of common parameters can be changed.D.13.3Use of multiple SMART CommunicatorsThe HART SMART protocol allows two SMART digital communicators to be active on the same loopat once. Only one of these can be a hand held communicator (known as “Secondary Master”) such asthe MOBREY-CK1 or the Rosemount 275 : the second must be a permanent monitoring system such asMOBREY H-View (which is designated as a ”Primary Master”).If two hand held communicators are connected to the same loop at the same time and both try tocommunicate at once there will be a conflict in the messages and neither unit will function correctly.59IP258