MN1957
Input / Output 4-7
www.baldormotion.com
4.3 Digital I/O
The NextMove ESB-2 provides:
20 general purpose digital inputs.
12 general purpose digital outputs.
4.3.1 Digital inputs
Digital inputs are available on connectors X8, X9 and X10, as shown in section 4.1.1.
The digital inputs are arranged in three groups, each with their own common connection.
This allows each group to be configured independently for ‘active high’ or ‘active low’
operation.
The general purpose digital inputs DIN0 - DIN19 can be shared between axes, and are
programmable in Mint (using a range of keywords beginning with the letters
INPUT
... ) to
determine their active level and if they should be edge triggered. The state of individual
inputs can be read directly using the
INX
keyword. See the Mint help file.
A general purpose digital input can be assigned to a special purpose function such as a
home, limit, stop or error input. See the keywords
HOMEINPUT
,
LIMITFORWARDINPUT
,
LIMITREVERSEINPUT
,
STOPINPUT
and
ERRORINPUT
in the Mint help file.
4.3.1.1 DIN0 - DIN3
Digital inputs DIN0 to DIN3 can be assigned as fast interrupts. These are used as high speed
position latches, allowing any combination of axes to be captured by the hardware. The
latency between input triggering and capture is 1
μ
s. Special Mint keywords (beginning with
the letters
FAST
...) allow specific functions to be performed as a result of fast position inputs
becoming active. See the Mint help file for details. Digital inputs DIN0 to DIN3 use CREF0 as
their common connection.
Figure 8: Fast interrupt digital input - DIN3 shown
Note:
The fast inputs are particularly sensitive to noise, so inputs must use shielded
twisted pair cable. Do not connect mechanical switches, relay contacts or other
sources liable to signal ‘bounce’ directly to the fast inputs. This could cause
unwanted multiple triggering.
100
R
3
k
3
4n7
NextMove E
S
B-2
D
IN
3
X10
1
2
3
S
hi
e
l
d
CR
E
F
0
V
cc
D
G
ND
Mint
TLP
115A
Servo Systems Co. • 115 Main Road • P.O. Box 97 • Montville, NJ,
07045-0097 • (973) 335-1007 • Toll Free: (800) 922-1103
Fax: (973) 335-1661 • www.servosystems.com
