7 Additional settings
Line count
Digital incremental encoders supply their angular information with the aid of track signals.
They supply periodic square (digital) signals at constant speed. The line count
corresponds to the number of full periods of a track per revolution. In most cases, the line
count is stated on a data sheet or type plate of the angle encoder. The incremental
encoder input always applies a quadruple evaluation. This is why the resolution is fourfold
higher than the line count itself. The effective line count is presented under "Number of
increments per rotation". If an index pulse is used, it is important that the number of lines
between the index pulses matches this value.
Mode
Quadrature evaluation (A-B-N)
The signals will be interpreted as standard incremental encoder signals. The system
evaluates two square track signals with a phase shift of 90° between them. This mode has
an optional zero track (index track) with a period signal "per line count".
Pulse direction
In this mode, one signal provides information about the change in position. Another signal
provides information about the direction of rotation. Due to the quadruple evaluation, the
line count referred to 90° must be specified here.
Up/down counter
This mode uses two signals that provide information about the change in position for a
specific direction of rotation. This is why one of the signal lines should always be at rest
when a pulse sequence is transmitted via the other signal line. Due to the quadruple
evaluation, the line count referred to 90° must be specified here.
Options
Ignore counter signals
The incremental signals will be ignored. The interface "sees" an encoder at a standstill.
Ignore zero pulse
In general, only incremental encoders or drives with a master frequency (incremental
encoder emulation) generate a periodic index pulse (zero pulse). This option can be used
to suppress such a signal if it is not provided. The index pulse may cause a sudden
change in position if, during operation, the individual increments of the AB track are not
properly identified. The index pulse should be evaluated to ensure that the firmware can
identify the completion of a revolution.
Error signal
This option can be used to activate or deactivate the detection of soiling or other problems
of the measuring system. The index pulse input is used for the error signal, i.e. the error
signal can only be evaluated if no index pulse track is parameterised. If an error is
detected, angle encoder error 08-7 will be issued. The evaluation of the error signal can be
inverted (low-active, NAS signal) or not (high-active, AS signal).
Product manual BL 4000-C Page 152 of 298
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