7 Additional settings
7.7
Digital inputs
Hazards for the user
The digital inputs of the servo drive are not suitable for safety-oriented applications.
Nine digital inputs provide fundamental control functions (see section 12.10
The BL 4100-C servo drives have a target table in which the positioning targets can be
stored and from which they can be retrieved at a later point of time. Four digital inputs are
used for the target selection; one input is used as a start input.
The limit switches are used to limit the range of movement for reasons of safety. During
homing, one of the two limit switches can be used as a reference point for positioning
control. Together with the STO inputs, one input is used for enabling the servo drive. Two
high-speed sampling inputs (DIN4 and DIN8) are used for position sampling. The digital
inputs can be universally assigned to various functions (e.g. positioning start, reference
switch, etc.).
The menu
Display/Digital inputs
provides an overview of the available digital inputs and
their current assignment:
Figure 97: "Digital inputs - Functional overview" window
If digital inputs are used multiple times, this is indicated by a
symbol in the functional
overview. In addition, some of the functions of the inputs are listed separated with
commas, thereby ensuring a quick overview. Clicking the
symbol displays all of the
functions of the associated input in a tree view.
Multiple use of digital inputs
Multiple use of digital inputs is tolerated by the firmware. The user is responsible for
checking whether the combinations are useful.
Product manual BL 4000-C
Page 168 of 298
