ABB REF 54 Series Technical Reference Manual

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Technical Reference Manual, General
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69
The command time-out parameter is located in MAIN MENU/Communication/
General.
For more information about secured object control refer to the control function block
manuals.
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The correct command time-out parameter value depends on how many LON
communication inputs are in use (COMM_INx variables). If no horizontal
communication is used, 1.5 seconds shall be used as time-out.
In order to take full advantage of the secured command handling procedure, the
complete scenario must be known.
There are two scenarios:
1. Confirmed command handling with NV poll support: NV poll selected by the
LNT tool.
2. Command handling with asynchronous blockings.
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If LON NV polling is used for communication inputs, the time-out must be based on
the minimum time-out, and is calculated from:
amount_of_polled_inputs*poll_timeout*(retries+1)
which gives a typical minimum value of:
amount_of_polled_inputs*128ms...256ms*5
(see the LN settings and refer to the instructions given for default time-outs).
An over dimensioned longer time-out will not cause any harm, because the operation
will always be faster in real life than the maximum time-out.
On application side, the comm_in and comm_outs need to be used systematically to
ensure that exceptions to the normal operation are handled correctly (e.g. handling
of the live bits).
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Figure 4.1.13.8-1 shows the asynchronous blocking principle of sending the reserve-
output state to the block-inputs of other bays. As horizontal communication is
trusted directly, 1.5 seconds shall be used as command time-out.
For more information about asynchronous blockings refer to the horizontal
communication engineering tip in the Configuration Guideline (1MRS 750745-
MUM).
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The feeder terminal is provided with either a fixed display or an external display
module. The external display module requires a separate voltage supply from a
common source with the main unit (refer to section “Auxiliary voltage” on page 28).
For more information about the rated input voltages, refer to Table 4.2.1-2 on
page 75. A special cable (1MRS120511.001) delivered with the feeder terminal is
needed for communication between the terminal and the external display panel.

ABB REF 54 Series Specifications

General

Brand	ABB
Model	REF 54 Series
Category	Touch terminals
Language	English