Specifications
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MX Protection, Control and Monitoring Features FCD LMENTB2300-01 – 07/08
3.3 Fo u n d a t i o n Fieldbus Communication
MX can be fitted with Fo u n d a t i o n Fieldbus protocol that complies with the IEC 61158-2 Fieldbus H1
standard. The field unit device is able to support several topologies, such as, point-to-point, bus with
spurs, daisy chain, tree, or a combination of these. The FF device has network features that include:
Link Active Scheduler that controls the system•
High-speed communications up to 31.25 kbits/sec•
Publisher - subscriber communication•
One analog input block, one analog output block, two discrete output function blocks, Transducer •
block, Resource block, and four discrete input function blocks
PID (proportional integral derivative) loop control (future)•
Device descriptions•
Configurable by user•
Link Active Scheduler communication: Fieldbus segments have one active Link Active Scheduler
(LAS) at a given time, which is the bus arbiter, and does the following:
Recognizes and adds new devices to the link•
Removes non-responsive devices from the link•
Schedules control activity in, and communication activity between, devices•
Regularly polls devices for process data•
Distributes a priority-driven token to devices for unscheduled transmissions•
3.4 PROFIBUS DP V1 Communication
MX can be fitted with Profibus DP_V1 protocol field units that comply with EN50170 Fieldbus
Standard for RS-485 communications. The device supports several topologies, such as, point-
to-point, bus with spurs, daisy chain, tree, or a combination of these. The PB device has network
features that include:
High-speed communications up to 1.5 m/bits/s•
Master-to-slave communication•
Slave redundancy (optional)•
One analog input block, one analog output block, two discrete output function blocks, Transducer •
block, Physical block, and four discrete input function blocks
Device descriptions configurable by user•
High-Speed Data Exchange – Startup Sequence
Power ON / Reset – Power On / Reset of master or slave •
Parameterization – download of parameters into field device (selected during configuration by the •
user)
I/O Configuration – download of I/O configuration into the field device (selected during configura-•
tion by the user)
Data Exchange – cyclic data exchange (I/O Data) and field device reports diagnostics •
3.5 PROFIBUS PA Communication
A Profibus PA protocol is available and complies with EN50170 Fieldbus Standard and Fieldbus
physical layer per IEC 61158-2 for communications. The device supports several topologies, such