Manual PD4-C (USB)
10 Special functions
Version: 1.4.1 / 22.07.2016 / FIR-v1626
65
0
31
15
16
Input 1
Special function
(e.g. limit switch)
Value of
the input
Bits of any object for controlling inputs
Values of inputs
Special functions of inputs
Overview
Note
The digital inputs are sampled only once a millisecond. Changes in the input signal shorter than one
millisecond cannot be processed.
The following inputs are available:
Input
Special Function
Signal threshold
switchable
Differential / single ended
1
Negative limit switch
no, 24 V fix
single ended
2
Positive limit switch
no, 24 V fix
single ended
3
Limit switch
no, 24 V fix
single ended
4
-Enable
5
+Enable
6
-Direction
7
+Direction
8
-Clock
9
+Clock
The inputs regarding
"Enable", "Direction" and
"Clock" can only be switch
all at once between 5 V or
24 V (see 3240
:06
h
)
The inputs regarding
"Enable", "Direction" and
"Clock" can only be switch
all at once. Set to "single
ended" the negative input is
deactivated (e.g. "-Enable")
(see 3240
h
:07
h
)
The limit switches are described in chapter Tolerance bands of the limit switches.
Object entries
The following object dictionary settings can be used to manipulate the value of an input, in which case
only the bit that corresponds to that input will have an effect:
•
h
:01
h
This bit is used to switch the special functions of an input on (value "0") or off (value "1"). If input 1 is
not to be used as a negative limit switch, for example, the special function must be switched off so
that the signal encoder is not erroneously responded to. The object has no effects on bits 16 to 31.
The firmware evaluates the following bits during a reference run (homing method):
•
Bit 0: negative limit switch
•
Bit 1: positive limit switch
•
Bit 2: reference switch
•
h
:02
h
This bit changes from closer logic (a logical high level at the input yields the value of "1" in object
60FD
h
) to opener logic (the logical high level at the input yields the value of "0"). This applies to the
special functions (except the clock and directional inputs) and for the normal input. The input is set
as closer logic if the corresponding bit is "0", it is set to opener logic with the value "1" respectively.
•
h
:03
h
