DESIGNER’S HANDBOOK 4189350049C EN
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A relay output can be:
a) Predefined in the product profile (PP) as product warning or alert outputs.
b) Predefined in the VI-setup (VS) as an output from a virtual indicator for example set up to be triggered
when the pointer enters a restricted section of the scale.
c) Predefined in the VS to be activated by a control flag.
Please note, that it is possible to activate a relay output function from both PP and VS at the same time. The relay
will when activate if either of the selected criteria are true.
5.7.5.1 Relay mode
Each relay can be predefined to one of the activation modes:
0x00= Normal De-energised (ND) = OFF
0x01 = Normal Energised (NE) = ON
Normal energised mode can be used if the relay output must activate a function either when the XDi supply power
is totally lost or when the relay function is true. This function is recommended when the relay functions for warnings
and alerts are used.
5.7.5.2 Timer function
It is possible to define a timer function to control the length of the relay activation or periodically repeat the relay
activation if the event is still true. This can be useful if the relay is activating a sound or light signal.
The timing of this function is selectable in steps of 500 msec.
This function can also be disabled.
5.7.5.3 Functions activated from product profile (PP)
0x00 = Disabled (PP function disabled)
0x01 = Activate on XDi Warning
0x02 = Activate on XDi Alert
0x03 = Activate on XDi Warning & Alert
These functions are self-explanatory.
5.7.5.4 Functions activated from the VI-setup (VS)
0x00 = Disabled (VS function disabled)
0x01 = Activated inside critical band
0x02 = Activate outside critical band
0x03 = Activate below user def. low value
0x04 = Activate above user def. high value
0x05 = Activate on flag-H (Flag AND mask >=1)
0x06 = Activate on flag-L (Flag AND mask =0)
The relay activation related to critical band can be controlled by one, two, three or all four critical bands for a data
type used by the selected virtual indicator.
The alternative to using critical band is to use a single low or high parameter to activate the relay.
Activation using a data flag includes a data-mask where desired flag bit (or bits) is
masked “in” using value “1”. The
relay can be set to either activate when one in-masked flag bit is going 1 or by all in-masked flag bits being 0.
See the XDi data sheet for technical specifications of the relays.
