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Gemini GV6K/GT6K Command Reference
LIMFNC
Input Function for Limit Inputs
Type
Inputs; Limits (end of travel); Homing
Syntax
<a_><!>LIMFNC<i>-<<a>c>
Units
i = input # on the “DRIVE I/O” connector (see page
8
);
a = program # for function P;
c = function identifier letter
Range
i = 1-3;
c = A-T
Default
(pre-assigned limits and home function -- see below)
Response
LIMFNC:
*LIMFNC1-A NO FUNCTION - STATUS OFF
(repeated for all onboard limit inputs)
See Also
COMEXR, COMEXS, [ ER ], ERROR, INDEB, INFNC, INPLC, INSELP,
INSTW, INTHW, JOY, JOYAXH, JOYVH, JOYVL, K, KDRIVE, LH,
[ LIM ], LIMEN, LIMFNC, LIMLVL, PSET, [ SS ], TER, TIN, TRGFN,
TRGLOT, [ TRIG ], TSS, TSTAT, TTRIG
Product Rev
GT6K 6.0
GV6K 6.0
The
LIMFNC
command defines the function of each individual limit input found on the “
DRIVE I/O
”
connector. The factory default configuration is that each dedicated hardware end-of-travel and home limit
is assigned to its respective
LIMFNC
function. That is, positive limit is assigned to
LIMFNC1-R
, negative
limit is assigned to
LIMFNC2-S
, home limit is assigned to
LIMFNC3-T
.
Input debounce
. By default, the limit inputs are assigned their respective end-of-travel or home
LIMFNC
functions (
R
,
S
or
T
). These limit functions are not debounced, but the hardware status (see
TLIM
and
LIM
) is
debounced with the Input Debounce Time (
INDEB
) command setting for I/O brick zero (default is 4 ms).
The
INDEB
debounce is the period of time that the input must be held in a certain state before the drive
recognizes it. This directly affects the rate at which the inputs can change state and be recognized. When a
limit input is assigned a function other than its respective end-of-travel or home
LIMFNC
function (
R
,
S
or
T
),
it is debounced the
INDEB
setting for I/O brick zero (default is 4 ms). If a limit is once again returned to its
respective
LIMFNC
function, the debounce is removed.
Input scan rate
: The limit inputs are scanned once per
system update
(2 milliseconds).
Enabling & disabling inputs
. Limit inputs assigned an end-of-travel input function (functions
R
or
S
described below) are enabled/disabled with the
LH
command — the default is enabled. Limit input
functions may be overridden with the
LIMEN
command — the default is enabled (no override).
Multitasking
. If the
LIMFNC
command does not include the task identifier (
%
) prefix, the function affects
the task that executes the
LIMFNC
command. The functions that may be directed to a task with
%
are:
C
,
D
,
E
,
F
, and
P
(e.g.,
2%LIMFNC3-F
assigns limit input 3 as a user fault input for task 2). Multiple tasks may
share the same input, but the input may only be assigned one function.
Identifier
Function Description
A
No special function
(general-purpose input)
.
Status can be used with the
LIM
assignment/comparison operator.
B
BCD Program Select.
BCD input assignment to programs, lowest numbered input is least
significant bit (LSB). BCD values for inputs are as follows:
BCD Value
Least Significant Bit Value
1
. 2
Most Significant Bit Value
4
Note
: If fewer inputs than shown above are defined to be Program Select Inputs, then the highest input number
defined as a Program Select Input is the most significant bit.
An input defined as a BCD Program Select Input will not function until the
INSELP
command has been enabled.
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