8 Switching functions
PHLOX II Ignition Control System 51
8.3 Assignment of communication modules
A switching function may also receive its current value from a communication module,
e.g., a CAN protocol such as DeviceNet or a serial protocol like Modbus.
The type of the communication module is indicated for each switching function in 24810
ChanTyp... These assignment parameters are parallel to the indication parameters for
switching functions that start from 2810 Switch....
Switching function source
no receipt from communications module
custom defined CAN protocol
HZM-CAN second control device of the same type (twin system)
WAGO module protocol (CANopen)
Table 13: Switching functions – Sources
Which switching functions are addressed by which bit of the communications telegram is
determined by the manufacturer of the sending module and must be agreed with the manu-
facturer. The switching functions received from the communications module are then
numbered from 1 onwards and the respective number is entered in the assignment parame-
ters starting from 20810 Comm... These assignment parameters are parallel to the indica-
tion parameters for switching functions that start from 2810 Switch....
Assignment of a value of 0 to 20810 Comm... means that the respective switching function
is not addressed by a communications module (but possibly by a digital input, see
8.2
Assignment of digital inputs). For communication purposes, such a switching function al-
ways has a value of 0.
For safety reasons, a function must be activated deliberately via a communications module.
For this reason, the switching functions addressed by communications modules can be only
high-active, i.e. become active on receipt of a "1", as opposed to digital inputs (
8.2 As-
signment of digital inputs). When the connection to the communication module is inter-
rupted, the switching function automatically adopts a value of 0.
8.4 Value of a switching function
With on-off switches the name is equivalent to the label On. State “1” of the switching
function will always define On and state “0” Off. The identifiers of change-over switches
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