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52
1MRS750881-MUM
Remote Monitoring and Control Unit
Technical Reference Manual
REC 523
6.3.
Communication overview
Fig. 6.3.-1 REC52_ Communication overview
6.4.
LON communication
LON communication to/from REC 523 units falls into two categories:
• Communication based on network variables
• Communication based on explicit messages
Network variables are used when communication need to be interoperable with
other commercially available LON devices. This is referred to as LonMark slave
communication. For more information about interoperable communication, refer to
the Echelon documents listed in Section 1.8. Related documents.
Explicit message communication falls into two main categories:
1) Standard LON messages (containing network management messages, router
configuration messages, and so on)
2) Foreign messages
Event
buffer
Application
IEC 61131
Remote
communication
protocol
Link
handler
Remote
comm.
line
Async. communication
SPA
slave
communication
connector X5.3
(connector X5.2
for parameterization)
Network Variables
(horizontal communication,
e.g. between two REC 523
units)
connector X5.3
SNVT_state
SNVT_lev_disc
NV indexes
0...63, 100...163
SNVT types
Lon Mark
comm. profile
NV indexes
64...97
L
O
N
line
Neuron
communication
COMM_OUT
COMM_IN
connector X5.1
LONMark
slave
communication
Commands or
parameterization
Sliding
window
Explicit Messages
(vertical communication,
e.g. MicroSCADA)
connector X5.3
Session
handling
1
2
3
4
Changed
process
data
Command
Commands or
parameterization
SPA
line
Async. communication
communi2