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LiAM Description
The value to be written is the ASCII string, formed by 2 hexadecimal digits, that
corresponds to the binary activation state mask; the eight external interlocks, as for
the interlock enable/disable mask, are numbered from 0 to 7.
Example: consider that both interlocks #1 and #2 are enabled – i.e. a "3" string
is contained in the EEPROM cell 48 – and interlock #2 needs to trip when the
corresponding input signals are shorted (LOW level) while interlock #1 when its input
is supplied from and external source (HIGH level); the value to be written to the
EEPROM cell 49 is the following:
The sent string has to be so interpreted:
0
don't care
In order to make this command taking effect it is necessary to perform a
'MUP\r' (Module Update Parameters) command – see "MUP command" section for
further details.
Content of the interlock enable/disable mask – i.e. EEPROM cell 48 – overrides
the content of the cell 49 so that the values contained in cell 49 are discarded if the
corresponding bit in cell 48 is '0' (and the interlock is disabled).
The MRG:49\r command returns a string containing the ASCII correspondent of
the interlock enable mask and contains information about what interlocks are
activated at a LOW state and what are activated at a HIGH state.
3.1.2.3 Interlock Configuration Example
Magnets can be water-cooled and there is a usual need for an interlock in case
of the water cooling system fault.
Let's consider a water flow switch that, by choice, can be connected to interlock
#2 of a LiAM interlock connector on the rear panel.
Water flow switch signals needs to be connected between pins 4 (+) and 3 (-) of
the rear interlock connector; in order to activate only interlock #2, the following
command need to be sent to the LiAM module:
MWG:49:1\r
1
0
0
Interlock 2
don't care
LOW
MWG:48:2\r
LiAM User's Manual
1
Interlock 1
HIGH
34
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