ABB REM 545 - LON Inputs and Outputs Via a LON Bus

1MRS750915-MUM
REM 54_
75
Machine Terminal
Technical Reference Manual, General
5.1.13.8. LON inputs and outputs via a LON bus
The machine terminal offers up to 32 freely programmable LON inputs and outputs
on the LON bus. The inputs and outputs use the LONMark Standard network
variable (NV type 83 = SNVT_state) for sending and receiving process data. The
LON inputs and outputs are accessible in the machine terminal configuration and
can be freely used for different types of data transfer between the machine terminals
and other devices that are able to communicate using the network variable of type
SNVT_state.
lonlog_b
Fig. 5.1.13.8.-1 Principle of connecting LON inputs and outputs to logic functions
of the machine terminal
The SNVT_state can be used to communicate the state of a set of 1 to 16 Boolean
values. Each bit indicates the state of the Boolean value with, for example, the
following interpretations:
The value field shows the current value of the digital inputs or outputs at the time of
reporting, or the latest value reported from the concerned device.
The SNVT_state can be used to transfer the state of 1 to 16 digital inputs, or to set
the state of 1 to 16 output bits or digital set-points.
01
off on
inactive active
disabled enabled
low high
false true
normal alarm
>1
nv16
nv16 nv16
I/O
REF 54_
>1
nv16
nv16 nv16
I/O
REF 54_
>1
nv16
RE_ 54_
SYS
LON
LON
RE_ 54_
>1
nv16
nv16
nv16
RE_ 54_
nv16 nv16 nv16
>1
nv16nv16
Inter-
locking
Blocking
Open
enable
Close
enable
Close
Open
Reserve
Inter-
locking
Open
enable
Close
enable
Close
Open
Reserve
Inter-
locking
Blocking
Open
enable
Close
enable
Close
Open
Reserve
Select/Execute
Blocking
I/O
I/O
I/O