HB-37350-810-01-51F-EN SMX Installation manual.docx Page 160 of 234
Version: 50F
5.11 Connection of position and speed sensors
5.11.1 General notes
Depending on module type the SMX module (SMX11/12) has external encoder interfaces for
the connection of industrial incremental and absolute encoders. The encoder interfaces can be
configured as incremental, SIN/COS, or as absolute SSI-encoders.
It is also possible to connect 2 incremental signal generating sensors (e.g. proximity switches)
to the counting inputs of the SMX module. The signals must each be read in with normal and
complementary track.
IMPORTANT
The voltage supply of the encoder system uses the dedicated terminals on the SMX module.
This voltage is applied to the encoder plug and monitored by an internal diagnostic process.
When the sensor is supplied with an external voltage, this voltage must be supplied through the
encoder plug. The corresponding terminal (encoder supply voltage) on the SMX module
remains unoccupied.
If an external sensor voltage supply is not recirculated through the encoder plug, any failure of
this supply must be included in the fault examination of the overall system. This, in particular,
requires evidence that this fault is detected or can be excluded when the specified operating
voltage of the overall system is fallen short of / exceeded.
EMC - measures such as shielding etc. must be observed.
The two encoders must be non-interacting to each other. This applies for both the electrical as
well as the mechanical part.
If both encoders are coupled to the facility to be monitored via common mechanical parts, the
connection must be positively designed and should not have any parts that are susceptible to
wear (chains, toothed belts, etc.). Should this be the case, additional monitoring features for the
mechanical connection of the sensors (e.g. monitoring of a toothed belt) are required).
In case of an active position processing at least one absolute value encoder must be used.
When using two equivalent sensors one must make sure that the sensor with the higher
resolution is configured as sensor 1 (process sensor) and the sensor with the lower resolution
as sensor 2 (reference sensor).
Safety note:
• The GND connections of the encoders must be connected to the GND of the SMX.
This applies in the same way also to resolvers.
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