8 Switching functions
52 PHLOX II Ignition Control System
or of parameters selecting between two functions always include the operator “Or”, where
the expression preceding “Or” will is valid when the value of the switching function is “1”
and where the expression following “Or” will be valid when the switching function has the
value “0”.
If no communication module is enabled in the current firmware, the value of the switching
function is determined exclusively by digital input. The parameters starting from 20810
Comm... and 24810 ChanTyp... do not exist.
If, on the other hand, a communication module must be taken into account, then each
switching function can be addressed either by a digital input or by the communications
module, or even by both.
1. Digital input only
Parameter 20810 Comm... must be set to 0.
When 810 Funct... = 0, then the switching function always has the value 0, other-
wise it has the current value of the digital input (possibly with inverted activity).
2. Communication module only
Parameter 810 Funct... must be set to 0 and 24810 ChanTyp... >= 3.
If 20810 Comm... = 0, then the switching function always has the value 0, other-
wise it has the current value of the received message. If the connection to the
communication module is interrupted, the switching function automatically adopts
the value 0.
3. Both digital input and communication module
Parameter 810 Funct... is not equal 0, 20810 Comm... > 0 and 24810 ChanTyp...
>= 3.
The current value from the digital input (possibly inverted) and from the commu-
nications module are linked by OR. The switching function will therefore be = 0
only if both sources send the value 0; it will be = 1 if at least one source sends the
value 1. When the connection to the communication module is interrupted, the
switching function automatically adopts the value 0 for this transmission path. In
this case, the digital input alone decides on the overall value.
For safety reasons HEINZMANN recommends connecting the ignition stop di-
rectly at all times, regardless of a possible additional transmission via a com-
munication module. On the other hand, HEINZMANN advises that you never
connect change-over switches that select between two functions (with “Or” in
their identifier) with two signal paths.
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