Integrated Synchronous Servo Drives
HFI 22xx / HFI 26xx / HFI 32xx / HFI 37xx
Parameterisation - Digital inputs/limit switches
Operating Manual Rev. 1.3
www.engelantriebe.de
Page 66
8.3
Digital inputs/limit switches
The device has 8 digital inputs DI1 … DI8, which are permanently assigned with different functions. In I/O mode, these
functions are mainly determined by the operating mode (
current control, speed control, positioning)
, which can be se-
lected under Optimisation
Operating mode, see the table below. In fieldbus mode only the digital inputs
DI1 … DI3 are assigned with functions.
Digital Inputs DI4 / DI5 are a special case. They can also be used as digital outputs if they are not assigned with an input
function. For available output functions see
chapter 8.4 Digital outputs
The function of the digital inputs DI2, DI3 is additionally depending on the selection of Limit switch monitoring, which
can be set under the menu item Optimisation
Digital inputs/Limit switches
.
Depending on the requirements of the application, optional limit switches can be used. Limit switches serve as restriction
of the movement range of the drive and can also be used as reference switches to determine the home position (see
chapter 8.2.3.1 Homing
If no limit switches are to be used, parameterize the selection shown in Figure
which also corresponds to the facto-
ry default.
The limit switch parameterisation can only be changed via DSerV.
Limit switch monitoring
Inactive: Function varies depending on operating mode (see footnotes under DI function table below).
Active: Function varies depending on operating mode (see footnotes under DI function table below).
Type of limit switch
Normally closed contacts (Active Low) - An activated switch interrupts the 24 V signal voltage to the DI.
Normally open contacts (Active High) - An activated switch applies the 24 V signal voltage to the DI.
Notes concerning normally closed contacts!
With Normally closed contacts, if only one limit/reference switch exists (e.g. at
digital input DI2), the other limit switch input (e.g. digital input DI3) must be tied to
24 V. Otherwise, the input is considered active and a positioning or reference error will
be triggered (see
chapter 12.3 Error messages in positioning mode
With Normally closed contacts a broken cable has the same effect as an activated
limit switch.
Figure 8-42: Digital inputs/Limit switches parameters
